diff --git a/rustbook-en/.github/workflows/main.yml b/rustbook-en/.github/workflows/main.yml
index 2b3ae3d5c..d17b7286a 100644
--- a/rustbook-en/.github/workflows/main.yml
+++ b/rustbook-en/.github/workflows/main.yml
@@ -24,8 +24,19 @@ jobs:
rustup --version
rustc -Vv
mdbook --version
+
+ # mdBook does not currently have particularly good support for “external”
+ # crates. To make the test suite work correctly with `trpl`, we must first
+ # build `trpl` itself (`mdbook` will not do it), and then explicitly pass
+ # its `deps` path as a library search path for `mdbook test`. That will make
+ # sure all the crates can be resolved when running the tests.
+ - name: Build `trpl` crate
+ run: |
+ cd packages/trpl
+ cargo build
- name: Run tests
- run: mdbook test
+ run:
+ mdbook test --library-path packages/trpl/target/debug/deps
package_tests:
name: Run package tests
runs-on: ubuntu-latest
diff --git a/rustbook-en/2018-edition/src/ch17-00-oop.md b/rustbook-en/2018-edition/src/ch17-00-oop.md
index c731bbc95..6ff4dc33e 100644
--- a/rustbook-en/2018-edition/src/ch17-00-oop.md
+++ b/rustbook-en/2018-edition/src/ch17-00-oop.md
@@ -3,8 +3,8 @@
The 2018 edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch17-00-oop.html) instead.
+version of the book](../ch18-00-oop.html) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
-1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch17-00-oop.html).
\ No newline at end of file
+1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch17-00-oop.html).
diff --git a/rustbook-en/2018-edition/src/ch17-01-what-is-oo.md b/rustbook-en/2018-edition/src/ch17-01-what-is-oo.md
index ed1ec4013..28835201b 100644
--- a/rustbook-en/2018-edition/src/ch17-01-what-is-oo.md
+++ b/rustbook-en/2018-edition/src/ch17-01-what-is-oo.md
@@ -3,8 +3,8 @@
The 2018 edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch17-01-what-is-oo.html) instead.
+version of the book](../ch18-01-what-is-oo.html) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
-1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch17-01-what-is-oo.html).
\ No newline at end of file
+1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch17-01-what-is-oo.html).
diff --git a/rustbook-en/2018-edition/src/ch17-02-trait-objects.md b/rustbook-en/2018-edition/src/ch17-02-trait-objects.md
index 1999647aa..b83ab904e 100644
--- a/rustbook-en/2018-edition/src/ch17-02-trait-objects.md
+++ b/rustbook-en/2018-edition/src/ch17-02-trait-objects.md
@@ -3,8 +3,8 @@
The 2018 edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch17-02-trait-objects.html) instead.
+version of the book](../ch18-02-trait-objects.html) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
-1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch17-02-trait-objects.html).
\ No newline at end of file
+1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch17-02-trait-objects.html).
diff --git a/rustbook-en/2018-edition/src/ch17-03-oo-design-patterns.md b/rustbook-en/2018-edition/src/ch17-03-oo-design-patterns.md
index 1b74425fe..c161b3dec 100644
--- a/rustbook-en/2018-edition/src/ch17-03-oo-design-patterns.md
+++ b/rustbook-en/2018-edition/src/ch17-03-oo-design-patterns.md
@@ -3,8 +3,8 @@
The 2018 edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch17-03-oo-design-patterns.html) instead.
+version of the book](../ch19-03-oo-design-patterns.html) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
-1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch17-03-oo-design-patterns.html).
\ No newline at end of file
+1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch17-03-oo-design-patterns.html).
diff --git a/rustbook-en/2018-edition/src/ch18-00-patterns.md b/rustbook-en/2018-edition/src/ch18-00-patterns.md
index f3da1f40d..213bac305 100644
--- a/rustbook-en/2018-edition/src/ch18-00-patterns.md
+++ b/rustbook-en/2018-edition/src/ch18-00-patterns.md
@@ -3,8 +3,8 @@
The 2018 edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch18-00-patterns.html) instead.
+version of the book](../ch19-00-patterns.html) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
-1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch18-00-patterns.html).
\ No newline at end of file
+1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch18-00-patterns.html).
diff --git a/rustbook-en/2018-edition/src/ch18-01-all-the-places-for-patterns.md b/rustbook-en/2018-edition/src/ch18-01-all-the-places-for-patterns.md
index ccf388406..f2dfa71a3 100644
--- a/rustbook-en/2018-edition/src/ch18-01-all-the-places-for-patterns.md
+++ b/rustbook-en/2018-edition/src/ch18-01-all-the-places-for-patterns.md
@@ -3,8 +3,8 @@
The 2018 edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch18-01-all-the-places-for-patterns.html) instead.
+version of the book](../ch19-01-all-the-places-for-patterns.html) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
-1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch18-01-all-the-places-for-patterns.html).
\ No newline at end of file
+1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch18-01-all-the-places-for-patterns.html).
diff --git a/rustbook-en/2018-edition/src/ch18-02-refutability.md b/rustbook-en/2018-edition/src/ch18-02-refutability.md
index a3e2bcff7..3eddb4dcd 100644
--- a/rustbook-en/2018-edition/src/ch18-02-refutability.md
+++ b/rustbook-en/2018-edition/src/ch18-02-refutability.md
@@ -3,8 +3,8 @@
The 2018 edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch18-02-refutability.html) instead.
+version of the book](../ch19-02-refutability.html) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
-1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch18-02-refutability.html).
\ No newline at end of file
+1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch18-02-refutability.html).
diff --git a/rustbook-en/2018-edition/src/ch18-03-pattern-syntax.md b/rustbook-en/2018-edition/src/ch18-03-pattern-syntax.md
index 0e0929e7b..44c73500e 100644
--- a/rustbook-en/2018-edition/src/ch18-03-pattern-syntax.md
+++ b/rustbook-en/2018-edition/src/ch18-03-pattern-syntax.md
@@ -3,8 +3,8 @@
The 2018 edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch18-03-pattern-syntax.html) instead.
+version of the book](../ch19-03-pattern-syntax.html) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
-1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch18-03-pattern-syntax.html).
\ No newline at end of file
+1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch18-03-pattern-syntax.html).
diff --git a/rustbook-en/2018-edition/src/ch19-00-advanced-features.md b/rustbook-en/2018-edition/src/ch19-00-advanced-features.md
index b34d6b9b6..16c72a906 100644
--- a/rustbook-en/2018-edition/src/ch19-00-advanced-features.md
+++ b/rustbook-en/2018-edition/src/ch19-00-advanced-features.md
@@ -3,8 +3,8 @@
The 2018 edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch19-00-advanced-features.html) instead.
+version of the book](../ch20-00-advanced-features.html) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
-1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch19-00-advanced-features.html).
\ No newline at end of file
+1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch19-00-advanced-features.html).
diff --git a/rustbook-en/2018-edition/src/ch19-01-unsafe-rust.md b/rustbook-en/2018-edition/src/ch19-01-unsafe-rust.md
index 34b569fee..7316eb44a 100644
--- a/rustbook-en/2018-edition/src/ch19-01-unsafe-rust.md
+++ b/rustbook-en/2018-edition/src/ch19-01-unsafe-rust.md
@@ -3,8 +3,8 @@
The 2018 edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch19-01-unsafe-rust.html) instead.
+version of the book](../ch20-01-unsafe-rust.html) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
-1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch19-01-unsafe-rust.html).
\ No newline at end of file
+1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch19-01-unsafe-rust.html).
diff --git a/rustbook-en/2018-edition/src/ch19-03-advanced-traits.md b/rustbook-en/2018-edition/src/ch19-03-advanced-traits.md
index 4219b208b..88ca1a55b 100644
--- a/rustbook-en/2018-edition/src/ch19-03-advanced-traits.md
+++ b/rustbook-en/2018-edition/src/ch19-03-advanced-traits.md
@@ -3,8 +3,8 @@
The 2018 edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch19-03-advanced-traits.html) instead.
+version of the book](../ch20-03-advanced-traits.html) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
-1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch19-03-advanced-traits.html).
\ No newline at end of file
+1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch19-03-advanced-traits.html).
diff --git a/rustbook-en/2018-edition/src/ch19-04-advanced-types.md b/rustbook-en/2018-edition/src/ch19-04-advanced-types.md
index fecbd52dc..c7c24439f 100644
--- a/rustbook-en/2018-edition/src/ch19-04-advanced-types.md
+++ b/rustbook-en/2018-edition/src/ch19-04-advanced-types.md
@@ -3,8 +3,8 @@
The 2018 edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch19-04-advanced-types.html) instead.
+version of the book](../ch20-04-advanced-types.html) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
-1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch19-04-advanced-types.html).
\ No newline at end of file
+1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch19-04-advanced-types.html).
diff --git a/rustbook-en/2018-edition/src/ch19-05-advanced-functions-and-closures.md b/rustbook-en/2018-edition/src/ch19-05-advanced-functions-and-closures.md
index 1bf045090..c46fd485e 100644
--- a/rustbook-en/2018-edition/src/ch19-05-advanced-functions-and-closures.md
+++ b/rustbook-en/2018-edition/src/ch19-05-advanced-functions-and-closures.md
@@ -3,8 +3,8 @@
The 2018 edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch19-05-advanced-functions-and-closures.html) instead.
+version of the book](../ch20-05-advanced-functions-and-closures.html) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
-1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch19-05-advanced-functions-and-closures.html).
\ No newline at end of file
+1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch19-05-advanced-functions-and-closures.html).
diff --git a/rustbook-en/2018-edition/src/ch19-06-macros.md b/rustbook-en/2018-edition/src/ch19-06-macros.md
index bf019c5d6..838a0b832 100644
--- a/rustbook-en/2018-edition/src/ch19-06-macros.md
+++ b/rustbook-en/2018-edition/src/ch19-06-macros.md
@@ -3,8 +3,8 @@
The 2018 edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch19-06-macros.html) instead.
+version of the book](../ch20-06-macros.html) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
-1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch19-06-macros.html).
\ No newline at end of file
+1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch19-06-macros.html).
diff --git a/rustbook-en/2018-edition/src/ch20-00-final-project-a-web-server.md b/rustbook-en/2018-edition/src/ch20-00-final-project-a-web-server.md
index f9b9e5c2d..cac558489 100644
--- a/rustbook-en/2018-edition/src/ch20-00-final-project-a-web-server.md
+++ b/rustbook-en/2018-edition/src/ch20-00-final-project-a-web-server.md
@@ -3,8 +3,8 @@
The 2018 edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch20-00-final-project-a-web-server.html) instead.
+version of the book](../ch21-00-final-project-a-web-server.html) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
-1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch20-00-final-project-a-web-server.html).
\ No newline at end of file
+1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch20-00-final-project-a-web-server.html).
diff --git a/rustbook-en/2018-edition/src/ch20-01-single-threaded.md b/rustbook-en/2018-edition/src/ch20-01-single-threaded.md
index 30d0884ad..e1b4200be 100644
--- a/rustbook-en/2018-edition/src/ch20-01-single-threaded.md
+++ b/rustbook-en/2018-edition/src/ch20-01-single-threaded.md
@@ -3,8 +3,8 @@
The 2018 edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch20-01-single-threaded.html) instead.
+version of the book](../ch21-01-single-threaded.html) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
-1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch20-01-single-threaded.html).
\ No newline at end of file
+1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch20-01-single-threaded.html).
diff --git a/rustbook-en/2018-edition/src/ch20-02-multithreaded.md b/rustbook-en/2018-edition/src/ch20-02-multithreaded.md
index e8b592ad2..7d54d56bc 100644
--- a/rustbook-en/2018-edition/src/ch20-02-multithreaded.md
+++ b/rustbook-en/2018-edition/src/ch20-02-multithreaded.md
@@ -3,8 +3,8 @@
The 2018 edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch20-02-multithreaded.html) instead.
+version of the book](../ch21-02-multithreaded.html) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
-1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch20-02-multithreaded.html).
\ No newline at end of file
+1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch20-02-multithreaded.html).
diff --git a/rustbook-en/2018-edition/src/ch20-03-graceful-shutdown-and-cleanup.md b/rustbook-en/2018-edition/src/ch20-03-graceful-shutdown-and-cleanup.md
index 928d199be..f4879c4ac 100644
--- a/rustbook-en/2018-edition/src/ch20-03-graceful-shutdown-and-cleanup.md
+++ b/rustbook-en/2018-edition/src/ch20-03-graceful-shutdown-and-cleanup.md
@@ -3,8 +3,8 @@
The 2018 edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch20-03-graceful-shutdown-and-cleanup.html) instead.
+version of the book](../ch21-03-graceful-shutdown-and-cleanup.html) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
-1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch20-03-graceful-shutdown-and-cleanup.html).
\ No newline at end of file
+1.30](https://doc.rust-lang.org/1.30.0/book/2018-edition/ch20-03-graceful-shutdown-and-cleanup.html).
diff --git a/rustbook-en/Cargo.lock b/rustbook-en/Cargo.lock
index d54e8284e..493ab8e68 100644
--- a/rustbook-en/Cargo.lock
+++ b/rustbook-en/Cargo.lock
@@ -318,9 +318,9 @@ dependencies = [
[[package]]
name = "windows-targets"
-version = "0.52.5"
+version = "0.52.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6f0713a46559409d202e70e28227288446bf7841d3211583a4b53e3f6d96e7eb"
+checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
dependencies = [
"windows_aarch64_gnullvm",
"windows_aarch64_msvc",
@@ -334,51 +334,51 @@ dependencies = [
[[package]]
name = "windows_aarch64_gnullvm"
-version = "0.52.5"
+version = "0.52.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7088eed71e8b8dda258ecc8bac5fb1153c5cffaf2578fc8ff5d61e23578d3263"
+checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
[[package]]
name = "windows_aarch64_msvc"
-version = "0.52.5"
+version = "0.52.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9985fd1504e250c615ca5f281c3f7a6da76213ebd5ccc9561496568a2752afb6"
+checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
[[package]]
name = "windows_i686_gnu"
-version = "0.52.5"
+version = "0.52.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "88ba073cf16d5372720ec942a8ccbf61626074c6d4dd2e745299726ce8b89670"
+checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
[[package]]
name = "windows_i686_gnullvm"
-version = "0.52.5"
+version = "0.52.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "87f4261229030a858f36b459e748ae97545d6f1ec60e5e0d6a3d32e0dc232ee9"
+checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
[[package]]
name = "windows_i686_msvc"
-version = "0.52.5"
+version = "0.52.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "db3c2bf3d13d5b658be73463284eaf12830ac9a26a90c717b7f771dfe97487bf"
+checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
[[package]]
name = "windows_x86_64_gnu"
-version = "0.52.5"
+version = "0.52.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4e4246f76bdeff09eb48875a0fd3e2af6aada79d409d33011886d3e1581517d9"
+checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
[[package]]
name = "windows_x86_64_gnullvm"
-version = "0.52.5"
+version = "0.52.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "852298e482cd67c356ddd9570386e2862b5673c85bd5f88df9ab6802b334c596"
+checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
[[package]]
name = "windows_x86_64_msvc"
-version = "0.52.5"
+version = "0.52.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bec47e5bfd1bff0eeaf6d8b485cc1074891a197ab4225d504cb7a1ab88b02bf0"
+checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
[[package]]
name = "xattr"
diff --git a/rustbook-en/Cargo.toml b/rustbook-en/Cargo.toml
index 2bddb66f9..20fc14643 100644
--- a/rustbook-en/Cargo.toml
+++ b/rustbook-en/Cargo.toml
@@ -6,6 +6,7 @@ exclude = [
"linkchecker", # linkchecker is part of the CI workflow
"listings", # these are intentionally distinct from the workspace
"tmp", # listings are built here when updating output via tools/update-rustc.sh
+ "packages/trpl", # manages its own dependencies as a standalone crate
# These are used as path dependencies in `rust-lang/rust` (since we are not
# publishing them to crates.io), so they cannot be part of this workspace,
diff --git a/rustbook-en/README.md b/rustbook-en/README.md
index 9648db0ae..b4426bd49 100644
--- a/rustbook-en/README.md
+++ b/rustbook-en/README.md
@@ -73,7 +73,8 @@ $ start chrome.exe .\book\index.html # Windows (Cmd)
To run the tests:
```bash
-$ mdbook test
+$ cd packages/trpl
+$ mdbook test --library-path packages/trpl/target/debug/deps
```
## Contributing
diff --git a/rustbook-en/book.toml b/rustbook-en/book.toml
index 800adcf0f..2f3319bdb 100644
--- a/rustbook-en/book.toml
+++ b/rustbook-en/book.toml
@@ -10,6 +10,26 @@ additional-css = ["ferris.css", "theme/2018-edition.css", "theme/semantic-notes.
additional-js = ["ferris.js"]
git-repository-url = "https://github.com/rust-lang/book"
+[output.html.redirect]
+"ch17-00-oop.html" = "ch18-00-oop.html"
+"ch17-01-what-is-oo.html" = "ch18-01-what-is-oo.html"
+"ch17-02-trait-objects.html" = "ch18-02-trait-objects.html"
+"ch17-03-oo-design-patterns.html" = "ch18-03-oo-design-patterns.html"
+"ch18-00-patterns.html" = "ch19-00-patterns.html"
+"ch18-01-all-the-places-for-patterns.html" = "ch19-01-all-the-places-for-patterns.html"
+"ch18-02-refutability.html" = "ch19-02-refutability.html"
+"ch18-03-pattern-syntax.html" = "ch19-03-pattern-syntax.html"
+"ch19-00-advanced-features.html" = "ch20-00-advanced-features.html"
+"ch19-01-unsafe-rust.html" = "ch20-01-unsafe-rust.html"
+"ch19-03-advanced-traits.html" = "ch20-03-advanced-traits.html"
+"ch19-04-advanced-types.html" = "ch20-04-advanced-types.html"
+"ch19-05-advanced-functions-and-closures.html" = "ch20-05-advanced-functions-and-closures.html"
+"ch19-06-macros.html" = "ch20-06-macros.html"
+"ch20-00-final-project-a-web-server.html" = "ch21-00-final-project-a-web-server.html"
+"ch20-01-single-threaded.html" = "ch21-01-single-threaded.html"
+"ch20-02-multithreaded.html" = "ch21-02-multithreaded.html"
+"ch20-03-graceful-shutdown-and-cleanup.html" = "ch21-03-graceful-shutdown-and-cleanup.html"
+
# Do not sync this preprocessor; it is for the HTML renderer only.
[preprocessor.trpl-note]
diff --git a/rustbook-en/ci/dictionary.txt b/rustbook-en/ci/dictionary.txt
index e2f5f670f..33d56857f 100644
--- a/rustbook-en/ci/dictionary.txt
+++ b/rustbook-en/ci/dictionary.txt
@@ -53,6 +53,7 @@ bool
boolean
Boolean
Booleans
+booleans
Bors
BorrowMutError
BoxMeUp
@@ -107,6 +108,7 @@ deallocate
deallocated
deallocating
deallocation
+debounce
debuginfo
decl
decrementing
@@ -143,10 +145,12 @@ DisplayBacktrace
DivAssign
DraftPost
DSTs
+durations
ebook
ebooks
Edsger
egular
+ElementRef
else's
emoji
encodings
@@ -177,6 +181,7 @@ filesystem's
filesystems
filmmaking
Firefox
+FirstAwaitPoint
FnMut
FnOnce
formatter
@@ -185,6 +190,8 @@ FrenchToast
FromIterator
FromResidual
frontend
+FuturesUnordered
+GetAwaitPoint
getrandom
getter
getters
@@ -195,6 +202,7 @@ grapheme
Grapheme
growable
gzip
+handoff
hardcode
hardcoded
hardcoding
@@ -239,7 +247,9 @@ inline
instantiation
internet
interoperate
+IntoFuture
IntoIterator
+intra
InvalidDigit
invariants
ioerror
@@ -254,6 +264,7 @@ isize
iter
iterator's
JavaScript
+JoinAll
JoinHandle
Kay's
kinded
@@ -286,12 +297,15 @@ lval
macOS
Matsakis
mathematic
+mdbook
memoization
metadata
Metadata
metaprogramming
mibbit
Mibbit
+microcontroller
+microcontrollers
millis
minigrep
mixup
@@ -305,10 +319,12 @@ monomorphized
MoveMessage
Mozilla
mpsc
+MSRV
msvc
MulAssign
multibyte
multithreaded
+multithreading
mutex
mutex's
Mutex
@@ -316,6 +332,7 @@ mutexes
Mutexes
MutexGuard
mutext
+MyAsyncStateMachine
MyBox
myprogram
namespace
@@ -356,7 +373,9 @@ OurError
OutlinePrint
overloadable
overread
+PageTitleFuture
PanicPayload
+parallelizable
param
parameterize
ParseIntError
@@ -369,6 +388,7 @@ PlaceholderType
polymorphism
PoolCreationError
portia
+postfix
powershell
PowerShell
powi
@@ -394,6 +414,8 @@ RangeTo
RangeFull
README
READMEs
+ReadFinished
+ReceiverStream
rect
recurse
recv
@@ -436,6 +458,7 @@ sampleproject
screenshot
searchstring
SecondaryColor
+SecondAwaitPoint
SelectBox
semver
SemVer
@@ -453,6 +476,7 @@ SliceIndex
Smalltalk
snuck
someproject
+SomeType
someusername
SPDX
spdx
@@ -468,6 +492,7 @@ stdlib
stdout
steveklabnik's
stringify
+StreamExt
Stroustrup
Stroustrup's
struct
@@ -500,6 +525,7 @@ TcpListener
TcpStream
templating
test's
+TextAwaitPoint
TextField
That'd
there'd
@@ -512,6 +538,8 @@ tlborm
tlsv
TODO
TokenStream
+Tokio
+tokio
toml
TOML
toolchain
@@ -536,6 +564,7 @@ uncomment
Uncomment
uncommenting
unevaluated
+unhandled
Uninstalling
uninstall
unittests
@@ -554,6 +583,7 @@ username
USERPROFILE
usize
UsState
+util
utils
vals
variable's
diff --git a/rustbook-en/dot/trpl17-01.dot b/rustbook-en/dot/trpl17-01.dot
new file mode 100644
index 000000000..ed2d969f2
--- /dev/null
+++ b/rustbook-en/dot/trpl17-01.dot
@@ -0,0 +1,41 @@
+digraph {
+ dpi = 300.0;
+
+ rankdir = "LR";
+
+ // makes ordering between subgraphs work
+ newrank = true;
+
+ node [shape = diamond;];
+
+ subgraph cluster_task_a {
+ label = "Task A";
+
+ A1;
+ A2;
+ A3;
+ A4;
+
+ A1 -> A2 -> A3 -> A4 -> A0 [style = invis;];
+
+ // for vertical alignment purposes only
+ A0 [style = invis;];
+
+ // Makes the heights line up between the boxes.
+ A4 -> A0 [style = invis;];
+ }
+
+ subgraph cluster_task_b {
+ label = "Task B";
+
+ B0 [style = invis;];
+
+ B1;
+ B2;
+ B3;
+
+ B0 -> B1 -> B2 -> B3 [style = invis;];
+ }
+
+ A1 -> B1 -> A2 -> B2 -> A3 -> A4 -> B3;
+}
\ No newline at end of file
diff --git a/rustbook-en/dot/trpl17-02.dot b/rustbook-en/dot/trpl17-02.dot
new file mode 100644
index 000000000..3e4116a7d
--- /dev/null
+++ b/rustbook-en/dot/trpl17-02.dot
@@ -0,0 +1,25 @@
+digraph {
+ dpi = 300.0;
+
+ rankdir = "LR";
+ splines = false;
+ cluster = true;
+
+ node [shape = diamond;];
+
+ // The graphs end up with the correct order, i.e. Task 1 *above* Task 2, when
+ // this is first.
+ subgraph cluster_ColleagueB {
+ label = "Task B";
+ B1 -> B2 -> B3;
+
+ B0 [style = invis;];
+ B3 -> B0 [style = invis;];
+ }
+
+ subgraph cluster_ColleagueA {
+ newrank = true;
+ label = "Task A";
+ A1 -> A2 -> A3 -> A4;
+ }
+}
\ No newline at end of file
diff --git a/rustbook-en/dot/trpl17-03.dot b/rustbook-en/dot/trpl17-03.dot
new file mode 100644
index 000000000..7d5a4971c
--- /dev/null
+++ b/rustbook-en/dot/trpl17-03.dot
@@ -0,0 +1,32 @@
+digraph {
+ dpi = 300.0;
+
+ rankdir = "LR";
+ splines = false;
+ cluster = true;
+
+ node [shape = diamond;];
+
+ // The graphs end up with the correct order, i.e. Task 1 *above* Task 2, when
+ // this is first.
+ subgraph cluster_ColleagueB {
+ label = "Task A";
+ A1;
+ A2;
+ A0_1 [style = invis;];
+ A3;
+
+ A1 -> A2;
+ A2 -> A0_1 [arrowhead = "tee"; headport = "A0_1:c"; headclip = false;];
+ A0_1;
+ A0_1 -> A3 [dir = both; arrowtail = "tee"; tailclip = false;];
+ }
+
+ subgraph cluster_ColleagueA {
+ newrank = true;
+ label = "Task B";
+ B1 -> B2 -> B3 -> B4;
+ }
+
+ B3 -> A3;
+}
\ No newline at end of file
diff --git a/rustbook-en/dot/trpl17-04.dot b/rustbook-en/dot/trpl17-04.dot
new file mode 100644
index 000000000..6c63b7bde
--- /dev/null
+++ b/rustbook-en/dot/trpl17-04.dot
@@ -0,0 +1,19 @@
+digraph {
+ rankdir = RL;
+ overlap = false;
+ dpi = 300.0;
+ splines = false;
+ cluster = true;
+
+ node [shape = "plaintext";];
+
+ fut1 [label = <>;];
+
+ edge [tailclip = "false";];
+ fut1:source:c -> fut1:target [dir = forward;];
+}
\ No newline at end of file
diff --git a/rustbook-en/dot/trpl17-05.dot b/rustbook-en/dot/trpl17-05.dot
new file mode 100644
index 000000000..afcf8e77a
--- /dev/null
+++ b/rustbook-en/dot/trpl17-05.dot
@@ -0,0 +1,32 @@
+digraph {
+ rankdir = RL;
+ overlap = false;
+ dpi = 300.0;
+ splines = false;
+ cluster = true;
+
+ node [shape = "plaintext";];
+
+ // Group the two together, which results in the desired alignment.
+ subgraph {
+ // But don't show the frame!
+ style = "invis";
+
+ fut1 [label = <>;];
+
+ fut2 [label = <>;];
+
+ edge [tailclip = "false"; dir = forward];
+ fut2:source:c -> fut1:target:e;
+ }
+}
\ No newline at end of file
diff --git a/rustbook-en/dot/trpl17-06.dot b/rustbook-en/dot/trpl17-06.dot
new file mode 100644
index 000000000..e036a385c
--- /dev/null
+++ b/rustbook-en/dot/trpl17-06.dot
@@ -0,0 +1,42 @@
+digraph {
+ rankdir = LR;
+ dpi = 300.0;
+
+ node [shape = "plaintext";];
+
+ pinned_box [label = <>;];
+
+ subgraph cluster_box {
+ label = "";
+ peripheries = 0;
+
+ subgraph cluster_box_internal {
+ peripheries = 1;
+ label = "b1";
+ shape = box;
+ style = solid;
+ pin [shape = "point";];
+ }
+ }
+
+ subgraph cluster_deref {
+ style = bold;
+ label = "pinned";
+
+ box [label = <>;];
+ }
+
+ edge [tailclip = false;];
+ pinned_box -> pin [tailport = "source:c"; arrowhead = "none";];
+ pin -> box [headport = "target";];
+ box -> box [tailport = "source:c"; headport = "internal";];
+}
\ No newline at end of file
diff --git a/rustbook-en/dot/trpl17-07.dot b/rustbook-en/dot/trpl17-07.dot
new file mode 100644
index 000000000..11b79574c
--- /dev/null
+++ b/rustbook-en/dot/trpl17-07.dot
@@ -0,0 +1,64 @@
+digraph {
+ rankdir = LR;
+ newrank = true;
+ dpi = 300.0;
+
+ node [shape = "plaintext";];
+
+
+ subgraph cluster_not_fut {
+ peripheries = 0;
+
+ pin [label = <>;];
+
+ subgraph cluster_boxes {
+ peripheries = 0;
+ rank = same;
+
+ subgraph cluster_box_1 {
+ subgraph cluster_box_2_internal {
+ label = "b1";
+ shape = box;
+ style = solid;
+ style = filled;
+ peripheries = 1;
+ box1 [shape = "point";style = "invis";];
+ }
+ }
+
+ subgraph cluster_box_2 {
+ subgraph cluster_box_2_internal {
+ label = "b2";
+ shape = box;
+ style = solid;
+ peripheries = 1;
+ box2 [shape = "point";];
+ }
+ }
+ }
+ }
+ subgraph cluster_target {
+ style = bold;
+ label = "pinned";
+
+ fut [label = <>;];
+ }
+
+
+ box1 -> box2 [rankdir = TB; style = invis;];
+
+ edge [tailclip = false;];
+ pin -> box1 [style = "invis";];
+ pin -> box2 [tailport = "source:c"; arrowhead = "none";];
+ box2 -> fut [headport = "target";];
+ fut -> fut [tailport = "source:c"; headport = "internal";];
+}
\ No newline at end of file
diff --git a/rustbook-en/dot/trpl17-08.dot b/rustbook-en/dot/trpl17-08.dot
new file mode 100644
index 000000000..8e9897f46
--- /dev/null
+++ b/rustbook-en/dot/trpl17-08.dot
@@ -0,0 +1,39 @@
+digraph {
+ rankdir = LR;
+ overlap = false;
+ dpi = 300.0;
+ splines = false;
+ cluster = true;
+ newrank = true;
+ outputorder = in;
+ compound = true;
+ labelloc = "c";
+
+ node [shape = "plaintext";];
+
+ pinned_box [label = <>;];
+
+
+ subgraph cluster_deref {
+ style = dashed;
+ label = "String";
+
+ pin [shape = "point";];
+
+ fut [label = <
+ | 5usize |
+ h |
+ e |
+ l |
+ l |
+ o |
+
>;];
+ }
+
+ edge [tailclip = false;];
+ pinned_box -> pin [tailport = "source:c"; arrowhead = "none";];
+ pin -> fut [headport = "target";];
+}
\ No newline at end of file
diff --git a/rustbook-en/dot/trpl17-09.dot b/rustbook-en/dot/trpl17-09.dot
new file mode 100644
index 000000000..de7300751
--- /dev/null
+++ b/rustbook-en/dot/trpl17-09.dot
@@ -0,0 +1,62 @@
+digraph {
+ rankdir = LR;
+ overlap = false;
+ dpi = 300.0;
+ splines = false;
+ cluster = true;
+ newrank = true;
+ outputorder = in;
+ compound = true;
+ labelloc = "c";
+
+ node [shape = "plaintext";];
+
+ pinned_box [label = <>;];
+
+ subgraph cluster_both {
+ peripheries = 0;
+
+
+
+ string1 [label = <
+ | s1 |
+
+ | 5usize |
+ h |
+ e |
+ l |
+ l |
+ o |
+
+
>;];
+
+ subgraph cluster_deref {
+ style = dashed;
+ label = "String";
+ peripheries = 1;
+
+ pin [shape = "point";];
+
+ string2 [label = <
+ | s2 |
+
+ | 7usize |
+ g |
+ o |
+ o |
+ d |
+ b |
+ y |
+ e |
+
+
>;];
+ }
+ }
+
+ edge [tailclip = false;];
+ pinned_box -> pin [tailport = "source:c"; arrowhead = "none";];
+ pin -> string2 [headport = "target";];
+}
\ No newline at end of file
diff --git a/rustbook-en/first-edition/src/associated-types.md b/rustbook-en/first-edition/src/associated-types.md
index 626048e9e..be7803498 100644
--- a/rustbook-en/first-edition/src/associated-types.md
+++ b/rustbook-en/first-edition/src/associated-types.md
@@ -3,7 +3,7 @@
The first edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch19-03-advanced-traits.html#specifying-placeholder-types-in-trait-definitions-with-associated-types) instead.
+version of the book](../ch20-03-advanced-traits.html#specifying-placeholder-types-in-trait-definitions-with-associated-types) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
diff --git a/rustbook-en/first-edition/src/const-and-static.md b/rustbook-en/first-edition/src/const-and-static.md
index aa634112b..7e667e50c 100644
--- a/rustbook-en/first-edition/src/const-and-static.md
+++ b/rustbook-en/first-edition/src/const-and-static.md
@@ -3,7 +3,7 @@
The first edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch19-01-unsafe-rust.html#accessing-or-modifying-a-mutable-static-variable) instead.
+version of the book](../ch20-01-unsafe-rust.html#accessing-or-modifying-a-mutable-static-variable) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
diff --git a/rustbook-en/first-edition/src/ffi.md b/rustbook-en/first-edition/src/ffi.md
index 2adaff9d8..a8c3f818e 100644
--- a/rustbook-en/first-edition/src/ffi.md
+++ b/rustbook-en/first-edition/src/ffi.md
@@ -3,7 +3,7 @@
The first edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch19-01-unsafe-rust.html#calling-rust-functions-from-other-languages) instead.
+version of the book](../ch20-01-unsafe-rust.html#calling-rust-functions-from-other-languages) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
diff --git a/rustbook-en/first-edition/src/macros.md b/rustbook-en/first-edition/src/macros.md
index 6bafdc1e4..eb9871ca4 100644
--- a/rustbook-en/first-edition/src/macros.md
+++ b/rustbook-en/first-edition/src/macros.md
@@ -3,7 +3,7 @@
The first edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch19-06-macros.html) instead.
+version of the book](../ch20-06-macros.html) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
diff --git a/rustbook-en/first-edition/src/operators-and-overloading.md b/rustbook-en/first-edition/src/operators-and-overloading.md
index 921a2a685..a13f44437 100644
--- a/rustbook-en/first-edition/src/operators-and-overloading.md
+++ b/rustbook-en/first-edition/src/operators-and-overloading.md
@@ -3,7 +3,7 @@
The first edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch19-03-advanced-traits.html#default-generic-type-parameters-and-operator-overloading) instead.
+version of the book](../ch20-03-advanced-traits.html#default-generic-type-parameters-and-operator-overloading) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
diff --git a/rustbook-en/first-edition/src/patterns.md b/rustbook-en/first-edition/src/patterns.md
index d722d397e..7bc6949b2 100644
--- a/rustbook-en/first-edition/src/patterns.md
+++ b/rustbook-en/first-edition/src/patterns.md
@@ -3,7 +3,7 @@
The first edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch18-03-pattern-syntax.html) instead.
+version of the book](../ch19-03-pattern-syntax.html) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
diff --git a/rustbook-en/first-edition/src/procedural-macros.md b/rustbook-en/first-edition/src/procedural-macros.md
index 9778383d8..3b683a975 100644
--- a/rustbook-en/first-edition/src/procedural-macros.md
+++ b/rustbook-en/first-edition/src/procedural-macros.md
@@ -3,7 +3,7 @@
The first edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch19-06-macros.html?highlight=procedural#procedural-macros-for-generating-code-from-attributes) instead.
+version of the book](../ch20-06-macros.html?highlight=procedural#procedural-macros-for-generating-code-from-attributes) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
diff --git a/rustbook-en/first-edition/src/raw-pointers.md b/rustbook-en/first-edition/src/raw-pointers.md
index c149da868..a4cc68d47 100644
--- a/rustbook-en/first-edition/src/raw-pointers.md
+++ b/rustbook-en/first-edition/src/raw-pointers.md
@@ -3,7 +3,7 @@
The first edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch19-01-unsafe-rust.html#dereferencing-a-raw-pointer) instead.
+version of the book](../ch20-01-unsafe-rust.html#dereferencing-a-raw-pointer) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
diff --git a/rustbook-en/first-edition/src/trait-objects.md b/rustbook-en/first-edition/src/trait-objects.md
index 871bad614..a04d16b4b 100644
--- a/rustbook-en/first-edition/src/trait-objects.md
+++ b/rustbook-en/first-edition/src/trait-objects.md
@@ -3,7 +3,7 @@
The first edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch17-02-trait-objects.html) instead.
+version of the book](../ch18-02-trait-objects.html) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
diff --git a/rustbook-en/first-edition/src/type-aliases.md b/rustbook-en/first-edition/src/type-aliases.md
index 7ac51ff19..d79974e55 100644
--- a/rustbook-en/first-edition/src/type-aliases.md
+++ b/rustbook-en/first-edition/src/type-aliases.md
@@ -3,7 +3,7 @@
The first edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch19-04-advanced-types.html#creating-type-synonyms-with-type-aliases) instead.
+version of the book](../ch20-04-advanced-types.html#creating-type-synonyms-with-type-aliases) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
diff --git a/rustbook-en/first-edition/src/unsafe.md b/rustbook-en/first-edition/src/unsafe.md
index be816dfd3..187fef52e 100644
--- a/rustbook-en/first-edition/src/unsafe.md
+++ b/rustbook-en/first-edition/src/unsafe.md
@@ -3,7 +3,7 @@
The first edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch19-01-unsafe-rust.html) instead.
+version of the book](../ch20-01-unsafe-rust.html) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
diff --git a/rustbook-en/first-edition/src/unsized-types.md b/rustbook-en/first-edition/src/unsized-types.md
index 4ec43ecad..5fb51b1fd 100644
--- a/rustbook-en/first-edition/src/unsized-types.md
+++ b/rustbook-en/first-edition/src/unsized-types.md
@@ -3,7 +3,7 @@
The first edition of the book is no longer distributed with Rust's documentation.
If you came here via a link or web search, you may want to check out [the current
-version of the book](../ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait) instead.
+version of the book](../ch20-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait) instead.
If you have an internet connection, you can [find a copy distributed with
Rust
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-01/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-01/Cargo.lock
new file mode 100644
index 000000000..4ee6b7a26
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new file mode 100644
index 000000000..57fe49bfe
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-01/Cargo.toml
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new file mode 100644
index 000000000..b4d9323f5
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-01/src/main.rs
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+
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+}
+
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+ .map(|title_element| title_element.inner_html())
+}
+// ANCHOR_END: all
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index 000000000..9a37f621b
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new file mode 100644
index 000000000..57fe49bfe
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-02/Cargo.toml
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new file mode 100644
index 000000000..e9c43b34d
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-02/src/main.rs
@@ -0,0 +1,16 @@
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+
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+}
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+ Html::parse(&response_text)
+ .select_first("title")
+ .map(|title_element| title_element.inner_html())
+}
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-03/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-03/Cargo.toml
new file mode 100644
index 000000000..57fe49bfe
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-03/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-03/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-03/src/main.rs
new file mode 100644
index 000000000..23290fff4
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-03/src/main.rs
@@ -0,0 +1,21 @@
+extern crate trpl; // required for mdbook test
+
+use trpl::Html;
+
+// ANCHOR: main
+async fn main() {
+ let args: Vec = std::env::args().collect();
+ let url = &args[1];
+ match page_title(url).await {
+ Some(title) => println!("The title for {url} was {title}"),
+ None => println!("{url} had no title"),
+ }
+}
+// ANCHOR_END: main
+
+async fn page_title(url: &str) -> Option {
+ let response_text = trpl::get(url).await.text().await;
+ Html::parse(&response_text)
+ .select_first("title")
+ .map(|title_element| title_element.inner_html())
+}
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-04/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-04/Cargo.lock
new file mode 100644
index 000000000..9a37f621b
--- /dev/null
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-04/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-04/Cargo.toml
new file mode 100644
index 000000000..57fe49bfe
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-04/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-04/output.txt b/rustbook-en/listings/ch17-async-await/listing-17-04/output.txt
new file mode 100644
index 000000000..a9b7a86ff
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-04/output.txt
@@ -0,0 +1,3 @@
+$ cargo run "http://www.rust-lang.org"
+The title for http://www.rust-lang.org was
+ Rust Programming Language
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-04/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-04/src/main.rs
new file mode 100644
index 000000000..23b2ea99f
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-04/src/main.rs
@@ -0,0 +1,24 @@
+extern crate trpl; // required for mdbook test
+
+use trpl::Html;
+
+// ANCHOR: run
+fn main() {
+ let args: Vec = std::env::args().collect();
+
+ trpl::run(async {
+ let url = &args[1];
+ match page_title(url).await {
+ Some(title) => println!("The title for {url} was {title}"),
+ None => println!("{url} had no title"),
+ }
+ })
+}
+// ANCHOR_END: run
+
+async fn page_title(url: &str) -> Option {
+ let response_text = trpl::get(url).await.text().await;
+ Html::parse(&response_text)
+ .select_first("title")
+ .map(|title_element| title_element.inner_html())
+}
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new file mode 100644
index 000000000..9a37f621b
--- /dev/null
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-05/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-05/Cargo.toml
new file mode 100644
index 000000000..57fe49bfe
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-05/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-05/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-05/src/main.rs
new file mode 100644
index 000000000..8a5546afd
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-05/src/main.rs
@@ -0,0 +1,34 @@
+extern crate trpl; // required for mdbook test
+
+// ANCHOR: all
+use trpl::{Either, Html};
+
+fn main() {
+ let args: Vec = std::env::args().collect();
+
+ trpl::run(async {
+ let title_fut_1 = page_title(&args[1]);
+ let title_fut_2 = page_title(&args[2]);
+
+ let (url, maybe_title) =
+ match trpl::race(title_fut_1, title_fut_2).await {
+ Either::Left(left) => left,
+ Either::Right(right) => right,
+ };
+
+ println!("{url} returned first");
+ match maybe_title {
+ Some(title) => println!("Its page title is: '{title}'"),
+ None => println!("Its title could not be parsed."),
+ }
+ })
+}
+
+async fn page_title(url: &str) -> (&str, Option) {
+ let text = trpl::get(url).await.text().await;
+ let title = Html::parse(&text)
+ .select_first("title")
+ .map(|title| title.inner_html());
+ (url, title)
+}
+// ANCHOR_END: all
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-06/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-06/Cargo.lock
new file mode 100644
index 000000000..0be7d2c88
--- /dev/null
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-06/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-06/Cargo.toml
new file mode 100644
index 000000000..349041d3e
--- /dev/null
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-06/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-06/src/main.rs
new file mode 100644
index 000000000..8eb415ee7
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-06/src/main.rs
@@ -0,0 +1,21 @@
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+}
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-07/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-07/Cargo.lock
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index 000000000..f09d29189
--- /dev/null
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-07/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-07/Cargo.toml
new file mode 100644
index 000000000..349041d3e
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-07/Cargo.toml
@@ -0,0 +1,9 @@
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+
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-07/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-07/src/main.rs
new file mode 100644
index 000000000..5415e1fce
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-07/src/main.rs
@@ -0,0 +1,23 @@
+extern crate trpl; // required for mdbook test
+
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+
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+ });
+}
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-08/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-08/Cargo.lock
new file mode 100644
index 000000000..f09d29189
--- /dev/null
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-08/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-08/Cargo.toml
new file mode 100644
index 000000000..349041d3e
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-08/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
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+version = "0.1.0"
+edition = "2021"
+
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+
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-08/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-08/src/main.rs
new file mode 100644
index 000000000..2cd5de9ba
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-08/src/main.rs
@@ -0,0 +1,25 @@
+extern crate trpl; // required for mdbook test
+
+use std::time::Duration;
+
+fn main() {
+ trpl::run(async {
+ // ANCHOR: join
+ let fut1 = async {
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+ }
+ };
+
+ trpl::join(fut1, fut2).await;
+ // ANCHOR_END: join
+ });
+}
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-09/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-09/Cargo.lock
new file mode 100644
index 000000000..f09d29189
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-09/Cargo.lock
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-09/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-09/Cargo.toml
new file mode 100644
index 000000000..349041d3e
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-09/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-09/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-09/src/main.rs
new file mode 100644
index 000000000..56daddc10
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-09/src/main.rs
@@ -0,0 +1,15 @@
+extern crate trpl; // required for mdbook test
+
+fn main() {
+ trpl::run(async {
+ // ANCHOR: channel
+ let (tx, mut rx) = trpl::channel();
+
+ let val = String::from("hi");
+ tx.send(val).unwrap();
+
+ let received = rx.recv().await.unwrap();
+ println!("Got: {received}");
+ // ANCHOR_END: channel
+ });
+}
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-10/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-10/Cargo.lock
new file mode 100644
index 000000000..f09d29189
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-10/Cargo.lock
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-10/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-10/Cargo.toml
new file mode 100644
index 000000000..349041d3e
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-10/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-10/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-10/src/main.rs
new file mode 100644
index 000000000..e11ae5178
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-10/src/main.rs
@@ -0,0 +1,27 @@
+extern crate trpl; // required for mdbook test
+
+use std::time::Duration;
+
+fn main() {
+ trpl::run(async {
+ // ANCHOR: many-messages
+ let (tx, mut rx) = trpl::channel();
+
+ let vals = vec![
+ String::from("hi"),
+ String::from("from"),
+ String::from("the"),
+ String::from("future"),
+ ];
+
+ for val in vals {
+ tx.send(val).unwrap();
+ trpl::sleep(Duration::from_millis(500)).await;
+ }
+
+ while let Some(value) = rx.recv().await {
+ println!("received '{value}'");
+ }
+ // ANCHOR_END: many-messages
+ });
+}
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new file mode 100644
index 000000000..f09d29189
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-11/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-11/Cargo.toml
new file mode 100644
index 000000000..349041d3e
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-11/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-11/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-11/src/main.rs
new file mode 100644
index 000000000..f8e641d6d
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-11/src/main.rs
@@ -0,0 +1,33 @@
+extern crate trpl; // required for mdbook test
+
+use std::time::Duration;
+
+fn main() {
+ trpl::run(async {
+ let (tx, mut rx) = trpl::channel();
+
+ // ANCHOR: futures
+ let tx_fut = async {
+ let vals = vec![
+ String::from("hi"),
+ String::from("from"),
+ String::from("the"),
+ String::from("future"),
+ ];
+
+ for val in vals {
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+ }
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+
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+ println!("received '{value}'");
+ }
+ };
+
+ trpl::join(tx_fut, rx_fut).await;
+ // ANCHOR_END: futures
+ });
+}
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new file mode 100644
index 000000000..f09d29189
--- /dev/null
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-12/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-12/Cargo.toml
new file mode 100644
index 000000000..349041d3e
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-12/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
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+version = "0.1.0"
+edition = "2021"
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+
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-12/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-12/src/main.rs
new file mode 100644
index 000000000..c22b7d2d7
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-12/src/main.rs
@@ -0,0 +1,33 @@
+extern crate trpl; // required for mdbook test
+
+use std::time::Duration;
+
+fn main() {
+ trpl::run(async {
+ // ANCHOR: with-move
+ let (tx, mut rx) = trpl::channel();
+
+ let tx_fut = async move {
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+ String::from("hi"),
+ String::from("from"),
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+ String::from("future"),
+ ];
+
+ for val in vals {
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+ eprintln!("received '{value}'");
+ }
+ };
+
+ trpl::join(tx_fut, rx_fut).await;
+ // ANCHOR_END: with-move
+ });
+}
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new file mode 100644
index 000000000..f09d29189
--- /dev/null
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-13/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-13/Cargo.toml
new file mode 100644
index 000000000..349041d3e
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-13/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-13/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-13/src/main.rs
new file mode 100644
index 000000000..d5a2e56e3
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-13/src/main.rs
@@ -0,0 +1,48 @@
+extern crate trpl; // required for mdbook test
+
+use std::time::Duration;
+
+fn main() {
+ trpl::run(async {
+ // ANCHOR: here
+ let (tx, mut rx) = trpl::channel();
+
+ let tx1 = tx.clone();
+ let tx1_fut = async move {
+ let vals = vec![
+ String::from("hi"),
+ String::from("from"),
+ String::from("the"),
+ String::from("future"),
+ ];
+
+ for val in vals {
+ tx1.send(val).unwrap();
+ trpl::sleep(Duration::from_millis(500)).await;
+ }
+ };
+
+ let rx_fut = async {
+ while let Some(value) = rx.recv().await {
+ println!("received '{value}'");
+ }
+ };
+
+ let tx_fut = async move {
+ let vals = vec![
+ String::from("more"),
+ String::from("messages"),
+ String::from("for"),
+ String::from("you"),
+ ];
+
+ for val in vals {
+ tx.send(val).unwrap();
+ trpl::sleep(Duration::from_millis(1500)).await;
+ }
+ };
+
+ trpl::join3(tx1_fut, tx_fut, rx_fut).await;
+ // ANCHOR_END: here
+ });
+}
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-14/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-14/Cargo.lock
new file mode 100644
index 000000000..f09d29189
--- /dev/null
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-14/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-14/Cargo.toml
new file mode 100644
index 000000000..349041d3e
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-14/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-14/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-14/src/main.rs
new file mode 100644
index 000000000..0bb425d36
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-14/src/main.rs
@@ -0,0 +1,48 @@
+extern crate trpl; // required for mdbook test
+
+use std::time::Duration;
+
+fn main() {
+ trpl::run(async {
+ let (tx, mut rx) = trpl::channel();
+
+ let tx1 = tx.clone();
+ let tx1_fut = async move {
+ let vals = vec![
+ String::from("hi"),
+ String::from("from"),
+ String::from("the"),
+ String::from("future"),
+ ];
+
+ for val in vals {
+ tx1.send(val).unwrap();
+ trpl::sleep(Duration::from_secs(1)).await;
+ }
+ };
+
+ let rx_fut = async {
+ while let Some(value) = rx.recv().await {
+ println!("received '{value}'");
+ }
+ };
+
+ let tx_fut = async move {
+ let vals = vec![
+ String::from("more"),
+ String::from("messages"),
+ String::from("for"),
+ String::from("you"),
+ ];
+
+ for val in vals {
+ tx.send(val).unwrap();
+ trpl::sleep(Duration::from_secs(1)).await;
+ }
+ };
+
+ // ANCHOR: here
+ trpl::join!(tx1_fut, tx_fut, rx_fut);
+ // ANCHOR_END: here
+ });
+}
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-15/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-15/Cargo.lock
new file mode 100644
index 000000000..f09d29189
--- /dev/null
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-15/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-15/Cargo.toml
new file mode 100644
index 000000000..349041d3e
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-15/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-15/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-15/src/main.rs
new file mode 100644
index 000000000..249ffd0f6
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-15/src/main.rs
@@ -0,0 +1,50 @@
+extern crate trpl; // required for mdbook test
+
+use std::time::Duration;
+
+fn main() {
+ trpl::run(async {
+ let (tx, mut rx) = trpl::channel();
+
+ let tx1 = tx.clone();
+ let tx1_fut = async move {
+ let vals = vec![
+ String::from("hi"),
+ String::from("from"),
+ String::from("the"),
+ String::from("future"),
+ ];
+
+ for val in vals {
+ tx1.send(val).unwrap();
+ trpl::sleep(Duration::from_secs(1)).await;
+ }
+ };
+
+ let rx_fut = async {
+ while let Some(value) = rx.recv().await {
+ println!("received '{value}'");
+ }
+ };
+
+ let tx_fut = async move {
+ let vals = vec![
+ String::from("more"),
+ String::from("messages"),
+ String::from("for"),
+ String::from("you"),
+ ];
+
+ for val in vals {
+ tx.send(val).unwrap();
+ trpl::sleep(Duration::from_secs(1)).await;
+ }
+ };
+
+ // ANCHOR: here
+ let futures = vec![tx1_fut, rx_fut, tx_fut];
+
+ trpl::join_all(futures).await;
+ // ANCHOR_END: here
+ });
+}
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-16/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-16/Cargo.lock
new file mode 100644
index 000000000..f09d29189
--- /dev/null
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-16/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-16/Cargo.toml
new file mode 100644
index 000000000..349041d3e
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-16/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-16/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-16/src/main.rs
new file mode 100644
index 000000000..9fefdcf46
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-16/src/main.rs
@@ -0,0 +1,51 @@
+extern crate trpl; // required for mdbook test
+
+use std::time::Duration;
+
+fn main() {
+ trpl::run(async {
+ let (tx, mut rx) = trpl::channel();
+
+ let tx1 = tx.clone();
+ let tx1_fut = async move {
+ let vals = vec![
+ String::from("hi"),
+ String::from("from"),
+ String::from("the"),
+ String::from("future"),
+ ];
+
+ for val in vals {
+ tx1.send(val).unwrap();
+ trpl::sleep(Duration::from_secs(1)).await;
+ }
+ };
+
+ let rx_fut = async {
+ while let Some(value) = rx.recv().await {
+ println!("received '{value}'");
+ }
+ };
+
+ let tx_fut = async move {
+ let vals = vec![
+ String::from("more"),
+ String::from("messages"),
+ String::from("for"),
+ String::from("you"),
+ ];
+
+ for val in vals {
+ tx.send(val).unwrap();
+ trpl::sleep(Duration::from_secs(1)).await;
+ }
+ };
+
+ // ANCHOR: here
+ let futures =
+ vec![Box::new(tx1_fut), Box::new(rx_fut), Box::new(tx_fut)];
+
+ trpl::join_all(futures).await;
+ // ANCHOR_END: here
+ });
+}
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-17/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-17/Cargo.lock
new file mode 100644
index 000000000..973206db6
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-17/Cargo.lock
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-17/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-17/Cargo.toml
new file mode 100644
index 000000000..349041d3e
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-17/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-17/output.txt b/rustbook-en/listings/ch17-async-await/listing-17-17/output.txt
new file mode 100644
index 000000000..b928fb602
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-17/output.txt
@@ -0,0 +1 @@
+$
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-17/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-17/src/main.rs
new file mode 100644
index 000000000..1888a5356
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-17/src/main.rs
@@ -0,0 +1,51 @@
+extern crate trpl; // required for mdbook test
+
+use std::{future::Future, time::Duration};
+
+fn main() {
+ trpl::run(async {
+ let (tx, mut rx) = trpl::channel();
+
+ let tx1 = tx.clone();
+ let tx1_fut = async move {
+ let vals = vec![
+ String::from("hi"),
+ String::from("from"),
+ String::from("the"),
+ String::from("future"),
+ ];
+
+ for val in vals {
+ tx1.send(val).unwrap();
+ trpl::sleep(Duration::from_secs(1)).await;
+ }
+ };
+
+ let rx_fut = async {
+ while let Some(value) = rx.recv().await {
+ println!("received '{value}'");
+ }
+ };
+
+ let tx_fut = async move {
+ let vals = vec![
+ String::from("more"),
+ String::from("messages"),
+ String::from("for"),
+ String::from("you"),
+ ];
+
+ for val in vals {
+ tx.send(val).unwrap();
+ trpl::sleep(Duration::from_secs(1)).await;
+ }
+ };
+
+ // ANCHOR: here
+ let futures: Vec>> =
+ vec![Box::new(tx1_fut), Box::new(rx_fut), Box::new(tx_fut)];
+ // ANCHOR_END: here
+
+ trpl::join_all(futures).await;
+ });
+}
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-18/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-18/Cargo.lock
new file mode 100644
index 000000000..f09d29189
--- /dev/null
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-18/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-18/Cargo.toml
new file mode 100644
index 000000000..349041d3e
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-18/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-18/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-18/src/main.rs
new file mode 100644
index 000000000..777366051
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-18/src/main.rs
@@ -0,0 +1,55 @@
+extern crate trpl; // required for mdbook test
+
+use std::{
+ future::Future,
+ pin::{pin, Pin},
+ time::Duration,
+};
+
+fn main() {
+ trpl::run(async {
+ let (tx, mut rx) = trpl::channel();
+
+ let tx1 = tx.clone();
+ let tx1_fut = pin!(async move {
+ let vals = vec![
+ String::from("hi"),
+ String::from("from"),
+ String::from("the"),
+ String::from("future"),
+ ];
+
+ for val in vals {
+ tx1.send(val).unwrap();
+ trpl::sleep(Duration::from_secs(1)).await;
+ }
+ });
+
+ let rx_fut = pin!(async {
+ while let Some(value) = rx.recv().await {
+ println!("received '{value}'");
+ }
+ });
+
+ let tx_fut = pin!(async move {
+ let vals = vec![
+ String::from("more"),
+ String::from("messages"),
+ String::from("for"),
+ String::from("you"),
+ ];
+
+ for val in vals {
+ tx.send(val).unwrap();
+ trpl::sleep(Duration::from_secs(1)).await;
+ }
+ });
+
+ // ANCHOR: here
+ let futures: Vec>>> =
+ vec![Box::pin(tx1_fut), Box::pin(rx_fut), Box::pin(tx_fut)];
+ // ANCHOR_END: here
+
+ trpl::join_all(futures).await;
+ });
+}
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-19/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-19/Cargo.lock
new file mode 100644
index 000000000..f09d29189
--- /dev/null
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-19/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-19/Cargo.toml
new file mode 100644
index 000000000..349041d3e
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-19/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-19/output.txt b/rustbook-en/listings/ch17-async-await/listing-17-19/output.txt
new file mode 100644
index 000000000..f6a657d5a
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-19/output.txt
@@ -0,0 +1,14 @@
+$ cargo run
+error: failed to get `trpl` as a dependency of package `async_await v0.1.0 (/Users/chris/dev/rust-lang/book/tmp/listings/ch17-async-await/listing-17-18)`
+
+Caused by:
+ failed to load source for dependency `trpl`
+
+Caused by:
+ Unable to update /Users/chris/dev/rust-lang/book/tmp/packages/trpl
+
+Caused by:
+ failed to read `/Users/chris/dev/rust-lang/book/tmp/packages/trpl/Cargo.toml`
+
+Caused by:
+ No such file or directory (os error 2)
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-19/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-19/src/main.rs
new file mode 100644
index 000000000..41820fc8a
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-19/src/main.rs
@@ -0,0 +1,66 @@
+extern crate trpl; // required for mdbook test
+
+use std::{
+ future::Future,
+ pin::{pin, Pin},
+ time::Duration,
+};
+
+fn main() {
+ trpl::run(async {
+ let (tx, mut rx) = trpl::channel();
+
+ let tx1 = tx.clone();
+ // ANCHOR: here
+ let tx1_fut = pin!(async move {
+ // --snip--
+ // ANCHOR_END: here
+ let vals = vec![
+ String::from("hi"),
+ String::from("from"),
+ String::from("the"),
+ String::from("future"),
+ ];
+
+ for val in vals {
+ tx1.send(val).unwrap();
+ trpl::sleep(Duration::from_secs(1)).await;
+ }
+ // ANCHOR: here
+ });
+
+ // ANCHOR_END: here
+ // ANCHOR: here
+ let rx_fut = pin!(async {
+ // --snip--
+ // ANCHOR_END: here
+ while let Some(value) = rx.recv().await {
+ println!("received '{value}'");
+ }
+ // ANCHOR: here
+ });
+
+ let tx_fut = pin!(async move {
+ // --snip--
+ // ANCHOR_END: here
+ let vals = vec![
+ String::from("more"),
+ String::from("messages"),
+ String::from("for"),
+ String::from("you"),
+ ];
+
+ for val in vals {
+ tx.send(val).unwrap();
+ trpl::sleep(Duration::from_secs(1)).await;
+ }
+ // ANCHOR: here
+ });
+
+ let futures: Vec>> =
+ vec![tx1_fut, rx_fut, tx_fut];
+ // ANCHOR_END: here
+
+ trpl::join_all(futures).await;
+ });
+}
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-20/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-20/Cargo.lock
new file mode 100644
index 000000000..f09d29189
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-20/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-20/Cargo.toml
new file mode 100644
index 000000000..349041d3e
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-20/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
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+
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-20/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-20/src/main.rs
new file mode 100644
index 000000000..12ab2704b
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-20/src/main.rs
@@ -0,0 +1,14 @@
+extern crate trpl; // required for mdbook test
+
+fn main() {
+ trpl::run(async {
+ // ANCHOR: here
+ let a = async { 1u32 };
+ let b = async { "Hello!" };
+ let c = async { true };
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+ println!("{a_result}, {b_result}, {c_result}");
+ // ANCHOR_END: here
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+}
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-21/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-21/Cargo.toml
new file mode 100644
index 000000000..349041d3e
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-21/Cargo.toml
@@ -0,0 +1,9 @@
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+
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-21/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-21/src/main.rs
new file mode 100644
index 000000000..308c14a4a
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-21/src/main.rs
@@ -0,0 +1,23 @@
+extern crate trpl; // required for mdbook test
+
+use std::time::Duration;
+
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+ // ANCHOR_END: here
+ });
+}
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-22/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-22/Cargo.lock
new file mode 100644
index 000000000..f09d29189
--- /dev/null
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-22/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-22/Cargo.toml
new file mode 100644
index 000000000..349041d3e
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-22/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
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+version = "0.1.0"
+edition = "2021"
+
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+
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-22/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-22/src/main.rs
new file mode 100644
index 000000000..2dfb52b7d
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-22/src/main.rs
@@ -0,0 +1,16 @@
+extern crate trpl; // required for mdbook test
+
+use std::{thread, time::Duration};
+
+fn main() {
+ trpl::run(async {
+ // We will call `slow` here later
+ });
+}
+
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+ thread::sleep(Duration::from_millis(ms));
+ println!("'{name}' ran for {ms}ms");
+}
+// ANCHOR_END: slow
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-23/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-23/Cargo.lock
new file mode 100644
index 000000000..f09d29189
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-23/Cargo.lock
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-23/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-23/Cargo.toml
new file mode 100644
index 000000000..349041d3e
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-23/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-23/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-23/src/main.rs
new file mode 100644
index 000000000..391cf39e1
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-23/src/main.rs
@@ -0,0 +1,35 @@
+extern crate trpl; // required for mdbook test
+
+use std::{thread, time::Duration};
+
+fn main() {
+ trpl::run(async {
+ // ANCHOR: slow-futures
+ let a = async {
+ println!("'a' started.");
+ slow("a", 30);
+ slow("a", 10);
+ slow("a", 20);
+ trpl::sleep(Duration::from_millis(50)).await;
+ println!("'a' finished.");
+ };
+
+ let b = async {
+ println!("'b' started.");
+ slow("b", 75);
+ slow("b", 10);
+ slow("b", 15);
+ slow("b", 350);
+ trpl::sleep(Duration::from_millis(50)).await;
+ println!("'b' finished.");
+ };
+
+ trpl::race(a, b).await;
+ // ANCHOR_END: slow-futures
+ });
+}
+
+fn slow(name: &str, ms: u64) {
+ thread::sleep(Duration::from_millis(ms));
+ println!("'{name}' ran for {ms}ms");
+}
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-24/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-24/Cargo.lock
new file mode 100644
index 000000000..f09d29189
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-24/Cargo.lock
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index 000000000..349041d3e
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+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-24/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-24/src/main.rs
new file mode 100644
index 000000000..961431d39
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-24/src/main.rs
@@ -0,0 +1,42 @@
+extern crate trpl; // required for mdbook test
+
+use std::{thread, time::Duration};
+
+fn main() {
+ trpl::run(async {
+ // ANCHOR: here
+ let one_ms = Duration::from_millis(1);
+
+ let a = async {
+ println!("'a' started.");
+ slow("a", 30);
+ trpl::sleep(one_ms).await;
+ slow("a", 10);
+ trpl::sleep(one_ms).await;
+ slow("a", 20);
+ trpl::sleep(one_ms).await;
+ println!("'a' finished.");
+ };
+
+ let b = async {
+ println!("'b' started.");
+ slow("b", 75);
+ trpl::sleep(one_ms).await;
+ slow("b", 10);
+ trpl::sleep(one_ms).await;
+ slow("b", 15);
+ trpl::sleep(one_ms).await;
+ slow("b", 35);
+ trpl::sleep(one_ms).await;
+ println!("'b' finished.");
+ };
+ // ANCHOR_END: here
+
+ trpl::race(a, b).await;
+ });
+}
+
+fn slow(name: &str, ms: u64) {
+ thread::sleep(Duration::from_millis(ms));
+ println!("'{name}' ran for {ms}ms");
+}
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new file mode 100644
index 000000000..f09d29189
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-25/Cargo.lock
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-25/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-25/Cargo.toml
new file mode 100644
index 000000000..349041d3e
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-25/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-25/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-25/src/main.rs
new file mode 100644
index 000000000..165022108
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-25/src/main.rs
@@ -0,0 +1,40 @@
+extern crate trpl; // required for mdbook test
+
+use std::{thread, time::Duration};
+
+fn main() {
+ trpl::run(async {
+ // ANCHOR: yields
+ let a = async {
+ println!("'a' started.");
+ slow("a", 30);
+ trpl::yield_now().await;
+ slow("a", 10);
+ trpl::yield_now().await;
+ slow("a", 20);
+ trpl::yield_now().await;
+ println!("'a' finished.");
+ };
+
+ let b = async {
+ println!("'b' started.");
+ slow("b", 75);
+ trpl::yield_now().await;
+ slow("b", 10);
+ trpl::yield_now().await;
+ slow("b", 15);
+ trpl::yield_now().await;
+ slow("b", 35);
+ trpl::yield_now().await;
+ println!("'b' finished.");
+ };
+ // ANCHOR_END: yields
+
+ trpl::race(a, b).await;
+ });
+}
+
+fn slow(name: &str, ms: u64) {
+ thread::sleep(Duration::from_millis(ms));
+ println!("'{name}' ran for {ms}ms");
+}
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-26/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-26/Cargo.lock
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index 000000000..34598194f
--- /dev/null
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-26/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-26/Cargo.toml
new file mode 100644
index 000000000..349041d3e
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-26/Cargo.toml
@@ -0,0 +1,9 @@
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+version = "0.1.0"
+edition = "2021"
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+
+[dependencies]
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-26/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-26/src/main.rs
new file mode 100644
index 000000000..31ce58d9e
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-26/src/main.rs
@@ -0,0 +1,36 @@
+extern crate trpl; // required for mdbook test
+
+use std::time::{Duration, Instant};
+
+fn main() {
+ trpl::run(async {
+ // ANCHOR: here
+ let one_ns = Duration::from_nanos(1);
+ let start = Instant::now();
+ async {
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+ .await;
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+ );
+
+ let start = Instant::now();
+ async {
+ for _ in 1..1000 {
+ trpl::yield_now().await;
+ }
+ }
+ .await;
+ let time = Instant::now() - start;
+ println!(
+ "'yield' version finished after {} seconds.",
+ time.as_secs_f32()
+ );
+ // ANCHOR_END: here
+ });
+}
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-27/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-27/Cargo.lock
new file mode 100644
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--- /dev/null
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-27/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-27/Cargo.toml
new file mode 100644
index 000000000..349041d3e
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-27/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
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+edition = "2021"
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+
+[dependencies]
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-27/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-27/src/main.rs
new file mode 100644
index 000000000..cdab72468
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-27/src/main.rs
@@ -0,0 +1,21 @@
+extern crate trpl; // required for mdbook test
+
+use std::time::Duration;
+
+fn main() {
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+ trpl::sleep(Duration::from_millis(100)).await;
+ "I finished!"
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+ // ANCHOR_END: here
+ });
+}
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new file mode 100644
index 000000000..f09d29189
--- /dev/null
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-28/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-28/Cargo.toml
new file mode 100644
index 000000000..349041d3e
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-28/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-28/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-28/src/main.rs
new file mode 100644
index 000000000..d2edded63
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-28/src/main.rs
@@ -0,0 +1,28 @@
+extern crate trpl; // required for mdbook test
+
+use std::{future::Future, time::Duration};
+
+fn main() {
+ trpl::run(async {
+ let slow = async {
+ trpl::sleep(Duration::from_secs(5)).await;
+ "Finally finished"
+ };
+
+ match timeout(slow, Duration::from_millis(10)).await {
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+ Err(duration) => {
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+ }
+ }
+ });
+}
+
+// ANCHOR: declaration
+async fn timeout(
+ future_to_try: F,
+ max_time: Duration,
+) -> Result {
+ // Here is where our implementation will go!
+}
+// ANCHOR_END: declaration
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-29/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-29/Cargo.lock
new file mode 100644
index 000000000..0be7d2c88
--- /dev/null
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-29/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-29/Cargo.toml
new file mode 100644
index 000000000..349041d3e
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-29/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-29/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-29/src/main.rs
new file mode 100644
index 000000000..9efb5e792
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-29/src/main.rs
@@ -0,0 +1,37 @@
+extern crate trpl; // required for mdbook test
+
+use std::{future::Future, time::Duration};
+
+// ANCHOR: implementation
+use trpl::Either;
+
+// --snip--
+// ANCHOR: implementation
+
+fn main() {
+ trpl::run(async {
+ let slow = async {
+ trpl::sleep(Duration::from_secs(5)).await;
+ "Finally finished"
+ };
+
+ match timeout(slow, Duration::from_secs(2)).await {
+ Ok(message) => println!("Succeeded with '{message}'"),
+ Err(duration) => {
+ println!("Failed after {} seconds", duration.as_secs())
+ }
+ }
+ });
+}
+
+async fn timeout(
+ future_to_try: F,
+ max_time: Duration,
+) -> Result {
+ // ANCHOR: implementation
+ match trpl::race(future_to_try, trpl::sleep(max_time)).await {
+ Either::Left(output) => Ok(output),
+ Either::Right(_) => Err(max_time),
+ }
+ // ANCHOR_END: implementation
+}
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-30/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-30/Cargo.lock
new file mode 100644
index 000000000..72e870c80
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-30/Cargo.lock
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-30/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-30/Cargo.toml
new file mode 100644
index 000000000..e094f067f
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-30/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-30/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-30/src/main.rs
new file mode 100644
index 000000000..faa6b6a1c
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-30/src/main.rs
@@ -0,0 +1,15 @@
+extern crate trpl; // required for mdbook test
+
+fn main() {
+ trpl::run(async {
+ // ANCHOR: stream
+ let values = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+ let iter = values.iter().map(|n| n * 2);
+ let mut stream = trpl::stream_from_iter(iter);
+
+ while let Some(value) = stream.next().await {
+ println!("The value was: {value}");
+ }
+ // ANCHOR_END: stream
+ });
+}
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-31/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-31/Cargo.lock
new file mode 100644
index 000000000..72e870c80
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-31/Cargo.lock
@@ -0,0 +1,1817 @@
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-31/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-31/Cargo.toml
new file mode 100644
index 000000000..e094f067f
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-31/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
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+[dependencies]
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-31/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-31/src/main.rs
new file mode 100644
index 000000000..f03a460aa
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-31/src/main.rs
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+extern crate trpl; // required for mdbook test
+
+// ANCHOR: all
+use trpl::StreamExt;
+
+fn main() {
+ trpl::run(async {
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+ let iter = values.iter().map(|n| n * 2);
+ let mut stream = trpl::stream_from_iter(iter);
+
+ while let Some(value) = stream.next().await {
+ println!("The value was: {value}");
+ }
+ });
+}
+// ANCHOR_END: all
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-32/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-32/Cargo.lock
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index 000000000..72e870c80
--- /dev/null
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-32/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-32/Cargo.toml
new file mode 100644
index 000000000..e094f067f
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-32/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
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+edition = "2021"
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+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-32/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-32/src/main.rs
new file mode 100644
index 000000000..2667c5e9a
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-32/src/main.rs
@@ -0,0 +1,20 @@
+extern crate trpl; // required for mdbook test
+
+// ANCHOR: all
+use trpl::StreamExt;
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+}
+// ANCHOR_END: all
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-33/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-33/Cargo.lock
new file mode 100644
index 000000000..72e870c80
--- /dev/null
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-33/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-33/Cargo.toml
new file mode 100644
index 000000000..e094f067f
--- /dev/null
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-33/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-33/src/main.rs
new file mode 100644
index 000000000..d9a7733d4
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-33/src/main.rs
@@ -0,0 +1,26 @@
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+
+// ANCHOR: all
+use trpl::{ReceiverStream, Stream, StreamExt};
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+}
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-34/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-34/Cargo.toml
new file mode 100644
index 000000000..e094f067f
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-34/Cargo.toml
@@ -0,0 +1,8 @@
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+[dependencies]
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-34/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-34/src/main.rs
new file mode 100644
index 000000000..de919073f
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-34/src/main.rs
@@ -0,0 +1,31 @@
+extern crate trpl; // required for mdbook test
+
+// ANCHOR: timeout
+use std::{pin::pin, time::Duration};
+use trpl::{ReceiverStream, Stream, StreamExt};
+
+fn main() {
+ trpl::run(async {
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+ pin!(get_messages().timeout(Duration::from_millis(200)));
+
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+}
+// ANCHOR_END: timeout
+
+fn get_messages() -> impl Stream
- {
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+
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+ for message in messages {
+ tx.send(format!("Message: '{message}'")).unwrap();
+ }
+
+ ReceiverStream::new(rx)
+}
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-35/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-35/Cargo.toml
new file mode 100644
index 000000000..e094f067f
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-35/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-35/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-35/src/main.rs
new file mode 100644
index 000000000..b4dda21d5
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-35/src/main.rs
@@ -0,0 +1,37 @@
+extern crate trpl; // required for mdbook test
+
+use std::{pin::pin, time::Duration};
+
+use trpl::{ReceiverStream, Stream, StreamExt};
+
+fn main() {
+ trpl::run(async {
+ let mut messages =
+ pin!(get_messages().timeout(Duration::from_millis(200)));
+
+ while let Some(result) = messages.next().await {
+ match result {
+ Ok(message) => println!("{message}"),
+ Err(reason) => eprintln!("Problem: {reason:?}"),
+ }
+ }
+ })
+}
+
+// ANCHOR: messages
+fn get_messages() -> impl Stream
- {
+ let (tx, rx) = trpl::channel();
+
+ trpl::spawn_task(async move {
+ let messages = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"];
+ for (index, message) in messages.into_iter().enumerate() {
+ let time_to_sleep = if index % 2 == 0 { 100 } else { 300 };
+ trpl::sleep(Duration::from_millis(time_to_sleep)).await;
+
+ tx.send(format!("Message: '{message}'")).unwrap();
+ }
+ });
+
+ ReceiverStream::new(rx)
+}
+// ANCHOR_END: messages
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-36/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-36/Cargo.lock
new file mode 100644
index 000000000..72e870c80
--- /dev/null
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-36/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-36/Cargo.toml
new file mode 100644
index 000000000..e094f067f
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-36/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-36/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-36/src/main.rs
new file mode 100644
index 000000000..13bd0b112
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-36/src/main.rs
@@ -0,0 +1,52 @@
+extern crate trpl; // required for mdbook test
+
+use std::{pin::pin, time::Duration};
+
+use trpl::{ReceiverStream, Stream, StreamExt};
+
+fn main() {
+ trpl::run(async {
+ let mut messages =
+ pin!(get_messages().timeout(Duration::from_millis(200)));
+
+ while let Some(result) = messages.next().await {
+ match result {
+ Ok(message) => println!("{message}"),
+ Err(reason) => eprintln!("Problem: {reason:?}"),
+ }
+ }
+ })
+}
+
+fn get_messages() -> impl Stream
- {
+ let (tx, rx) = trpl::channel();
+
+ trpl::spawn_task(async move {
+ let messages = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"];
+ for (index, message) in messages.into_iter().enumerate() {
+ let time_to_sleep = if index % 2 == 0 { 100 } else { 300 };
+ trpl::sleep(Duration::from_millis(time_to_sleep)).await;
+
+ tx.send(format!("Message: '{message}'")).unwrap();
+ }
+ });
+
+ ReceiverStream::new(rx)
+}
+
+// ANCHOR: intervals
+fn get_intervals() -> impl Stream
- {
+ let (tx, rx) = trpl::channel();
+
+ trpl::spawn_task(async move {
+ let mut count = 0;
+ loop {
+ trpl::sleep(Duration::from_millis(1)).await;
+ count += 1;
+ tx.send(count).unwrap();
+ }
+ });
+
+ ReceiverStream::new(rx)
+}
+// ANCHOR_END: intervals
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-37/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-37/Cargo.lock
new file mode 100644
index 000000000..72e870c80
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-37/Cargo.lock
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-37/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-37/Cargo.toml
new file mode 100644
index 000000000..e094f067f
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-37/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-37/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-37/src/main.rs
new file mode 100644
index 000000000..bc10dd48c
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-37/src/main.rs
@@ -0,0 +1,53 @@
+extern crate trpl; // required for mdbook test
+
+use std::{pin::pin, time::Duration};
+
+use trpl::{ReceiverStream, Stream, StreamExt};
+
+fn main() {
+ trpl::run(async {
+ // ANCHOR: main
+ let messages = get_messages().timeout(Duration::from_millis(200));
+ let intervals = get_intervals();
+ let merged = messages.merge(intervals);
+ // ANCHOR_END: main
+
+ while let Some(result) = merged.next().await {
+ match result {
+ Ok(message) => println!("{message}"),
+ Err(reason) => eprintln!("Problem: {reason:?}"),
+ }
+ }
+ })
+}
+
+fn get_messages() -> impl Stream
- {
+ let (tx, rx) = trpl::channel();
+
+ trpl::spawn_task(async move {
+ let messages = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"];
+ for (index, message) in messages.into_iter().enumerate() {
+ let time_to_sleep = if index % 2 == 0 { 100 } else { 300 };
+ trpl::sleep(Duration::from_millis(time_to_sleep)).await;
+
+ tx.send(format!("Message: '{message}'")).unwrap();
+ }
+ });
+
+ ReceiverStream::new(rx)
+}
+
+fn get_intervals() -> impl Stream
- {
+ let (tx, rx) = trpl::channel();
+
+ trpl::spawn_task(async move {
+ let mut count = 0;
+ loop {
+ trpl::sleep(Duration::from_millis(1)).await;
+ count += 1;
+ tx.send(count).unwrap();
+ }
+ });
+
+ ReceiverStream::new(rx)
+}
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-38/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-38/Cargo.lock
new file mode 100644
index 000000000..72e870c80
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-38/Cargo.lock
@@ -0,0 +1,1817 @@
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+# It is not intended for manual editing.
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-38/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-38/Cargo.toml
new file mode 100644
index 000000000..e094f067f
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-38/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-38/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-38/src/main.rs
new file mode 100644
index 000000000..72da09d75
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-38/src/main.rs
@@ -0,0 +1,56 @@
+extern crate trpl; // required for mdbook test
+
+use std::{pin::pin, time::Duration};
+
+use trpl::{ReceiverStream, Stream, StreamExt};
+
+fn main() {
+ trpl::run(async {
+ // ANCHOR: main
+ let messages = get_messages().timeout(Duration::from_millis(200));
+ let intervals = get_intervals()
+ .map(|count| format!("Interval: {count}"))
+ .timeout(Duration::from_secs(10));
+ let merged = messages.merge(intervals);
+ let mut stream = pin!(merged);
+ // ANCHOR_END: main
+
+ while let Some(result) = stream.next().await {
+ match result {
+ Ok(message) => println!("{message}"),
+ Err(reason) => eprintln!("Problem: {reason:?}"),
+ }
+ }
+ })
+}
+
+fn get_messages() -> impl Stream
- {
+ let (tx, rx) = trpl::channel();
+
+ trpl::spawn_task(async move {
+ let messages = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"];
+ for (index, message) in messages.into_iter().enumerate() {
+ let time_to_sleep = if index % 2 == 0 { 100 } else { 300 };
+ trpl::sleep(Duration::from_millis(time_to_sleep)).await;
+
+ tx.send(format!("Message: '{message}'")).unwrap();
+ }
+ });
+
+ ReceiverStream::new(rx)
+}
+
+fn get_intervals() -> impl Stream
- {
+ let (tx, rx) = trpl::channel();
+
+ trpl::spawn_task(async move {
+ let mut count = 0;
+ loop {
+ trpl::sleep(Duration::from_millis(1)).await;
+ count += 1;
+ tx.send(count).unwrap();
+ }
+ });
+
+ ReceiverStream::new(rx)
+}
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-39/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-39/Cargo.lock
new file mode 100644
index 000000000..72e870c80
--- /dev/null
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-39/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-39/Cargo.toml
new file mode 100644
index 000000000..e094f067f
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-39/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-39/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-39/src/main.rs
new file mode 100644
index 000000000..57ed7bed4
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-39/src/main.rs
@@ -0,0 +1,57 @@
+extern crate trpl; // required for mdbook test
+
+use std::{pin::pin, time::Duration};
+
+use trpl::{ReceiverStream, Stream, StreamExt};
+
+fn main() {
+ trpl::run(async {
+ // ANCHOR: throttle
+ let messages = get_messages().timeout(Duration::from_millis(200));
+ let intervals = get_intervals()
+ .map(|count| format!("Interval: {count}"))
+ .throttle(Duration::from_millis(100))
+ .timeout(Duration::from_secs(10));
+ let merged = messages.merge(intervals).take(20);
+ let mut stream = pin!(merged);
+ // ANCHOR_END: throttle
+
+ while let Some(result) = stream.next().await {
+ match result {
+ Ok(message) => println!("{message}"),
+ Err(reason) => eprintln!("Problem: {reason:?}"),
+ }
+ }
+ })
+}
+
+fn get_messages() -> impl Stream
- {
+ let (tx, rx) = trpl::channel();
+
+ trpl::spawn_task(async move {
+ let messages = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"];
+ for (index, message) in messages.into_iter().enumerate() {
+ let time_to_sleep = if index % 2 == 0 { 100 } else { 300 };
+ trpl::sleep(Duration::from_millis(time_to_sleep)).await;
+
+ tx.send(format!("Message: '{message}'")).unwrap();
+ }
+ });
+
+ ReceiverStream::new(rx)
+}
+
+fn get_intervals() -> impl Stream
- {
+ let (tx, rx) = trpl::channel();
+
+ trpl::spawn_task(async move {
+ let mut count = 0;
+ loop {
+ trpl::sleep(Duration::from_millis(1)).await;
+ count += 1;
+ tx.send(count).unwrap();
+ }
+ });
+
+ ReceiverStream::new(rx)
+}
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-40/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-40/Cargo.lock
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index 000000000..72e870c80
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-40/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-40/Cargo.toml
new file mode 100644
index 000000000..e094f067f
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-40/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-40/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-40/src/main.rs
new file mode 100644
index 000000000..ecf406e93
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-40/src/main.rs
@@ -0,0 +1,65 @@
+extern crate trpl; // required for mdbook test
+
+use std::{pin::pin, time::Duration};
+
+use trpl::{ReceiverStream, Stream, StreamExt};
+
+fn main() {
+ trpl::run(async {
+ let messages = get_messages().timeout(Duration::from_millis(200));
+ let intervals = get_intervals()
+ .map(|count| format!("Interval #{count}"))
+ .throttle(Duration::from_millis(500))
+ .timeout(Duration::from_secs(10));
+ let merged = messages.merge(intervals).take(20);
+ let mut stream = pin!(merged);
+
+ while let Some(result) = stream.next().await {
+ match result {
+ Ok(item) => println!("{item}"),
+ Err(reason) => eprintln!("Problem: {reason:?}"),
+ }
+ }
+ });
+}
+
+// ANCHOR: errors
+fn get_messages() -> impl Stream
- {
+ let (tx, rx) = trpl::channel();
+
+ trpl::spawn_task(async move {
+ let messages = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"];
+
+ for (index, message) in messages.into_iter().enumerate() {
+ let time_to_sleep = if index % 2 == 0 { 100 } else { 300 };
+ trpl::sleep(Duration::from_millis(time_to_sleep)).await;
+
+ if let Err(send_error) = tx.send(format!("Message: '{message}'")) {
+ eprintln!("Cannot send message '{message}': {send_error}");
+ break;
+ }
+ }
+ });
+
+ ReceiverStream::new(rx)
+}
+
+fn get_intervals() -> impl Stream
- {
+ let (tx, rx) = trpl::channel();
+
+ trpl::spawn_task(async move {
+ let mut count = 0;
+ loop {
+ trpl::sleep(Duration::from_millis(1)).await;
+ count += 1;
+
+ if let Err(send_error) = tx.send(count) {
+ eprintln!("Could not send interval {count}: {send_error}");
+ break;
+ };
+ }
+ });
+
+ ReceiverStream::new(rx)
+}
+// ANCHOR_END: errors
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-41/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-41/Cargo.lock
new file mode 100644
index 000000000..72e870c80
--- /dev/null
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-41/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-41/Cargo.toml
new file mode 100644
index 000000000..e094f067f
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-41/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-41/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-41/src/main.rs
new file mode 100644
index 000000000..f1f3d4b0c
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-41/src/main.rs
@@ -0,0 +1,67 @@
+extern crate trpl; // required for mdbook test
+
+use std::{pin::pin, thread, time::Duration};
+
+use trpl::{ReceiverStream, Stream, StreamExt};
+
+fn main() {
+ trpl::run(async {
+ let messages = get_messages().timeout(Duration::from_millis(200));
+ let intervals = get_intervals()
+ .map(|count| format!("Interval #{count}"))
+ .throttle(Duration::from_millis(500))
+ .timeout(Duration::from_secs(10));
+ let merged = messages.merge(intervals).take(20);
+ let mut stream = pin!(merged);
+
+ while let Some(result) = stream.next().await {
+ match result {
+ Ok(item) => println!("{item}"),
+ Err(reason) => eprintln!("Problem: {reason:?}"),
+ }
+ }
+ });
+}
+
+fn get_messages() -> impl Stream
- {
+ let (tx, rx) = trpl::channel();
+
+ trpl::spawn_task(async move {
+ let messages = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"];
+
+ for (index, message) in messages.into_iter().enumerate() {
+ let time_to_sleep = if index % 2 == 0 { 100 } else { 300 };
+ trpl::sleep(Duration::from_millis(time_to_sleep)).await;
+
+ if let Err(send_error) = tx.send(format!("Message: '{message}'")) {
+ eprintln!("Cannot send message '{message}': {send_error}");
+ break;
+ }
+ }
+ });
+
+ ReceiverStream::new(rx)
+}
+
+// ANCHOR: threads
+fn get_intervals() -> impl Stream
- {
+ let (tx, rx) = trpl::channel();
+
+ // This is *not* `trpl::spawn` but `std::thread::spawn`!
+ thread::spawn(move || {
+ let mut count = 0;
+ loop {
+ // Likewise, this is *not* `trpl::sleep` but `std::thread::sleep`!
+ thread::sleep(Duration::from_millis(1));
+ count += 1;
+
+ if let Err(send_error) = tx.send(count) {
+ eprintln!("Could not send interval {count}: {send_error}");
+ break;
+ };
+ }
+ });
+
+ ReceiverStream::new(rx)
+}
+// ANCHOR_END: threads
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-42/Cargo.lock b/rustbook-en/listings/ch17-async-await/listing-17-42/Cargo.lock
new file mode 100644
index 000000000..071a0943b
--- /dev/null
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diff --git a/rustbook-en/listings/ch17-async-await/listing-17-42/Cargo.toml b/rustbook-en/listings/ch17-async-await/listing-17-42/Cargo.toml
new file mode 100644
index 000000000..e094f067f
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-42/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/listing-17-42/src/main.rs b/rustbook-en/listings/ch17-async-await/listing-17-42/src/main.rs
new file mode 100644
index 000000000..1a508bf58
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/listing-17-42/src/main.rs
@@ -0,0 +1,22 @@
+extern crate trpl; // for mdbook test
+
+// ANCHOR: all
+use std::{thread, time::Duration};
+
+fn main() {
+ let (tx, mut rx) = trpl::channel();
+
+ thread::spawn(move || {
+ for i in 1..11 {
+ tx.send(i).unwrap();
+ thread::sleep(Duration::from_secs(1));
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+
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+ println!("{message}");
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+ });
+}
+// ANCHOR_END: all
diff --git a/rustbook-en/listings/ch17-async-await/no-listing-state-machine/Cargo.lock b/rustbook-en/listings/ch17-async-await/no-listing-state-machine/Cargo.lock
new file mode 100644
index 000000000..7b6b110bc
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/no-listing-state-machine/Cargo.lock
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diff --git a/rustbook-en/listings/ch17-async-await/no-listing-state-machine/Cargo.toml b/rustbook-en/listings/ch17-async-await/no-listing-state-machine/Cargo.toml
new file mode 100644
index 000000000..e094f067f
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/no-listing-state-machine/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[dependencies]
+trpl = { path = "../../../packages/trpl" }
diff --git a/rustbook-en/listings/ch17-async-await/no-listing-state-machine/output.txt b/rustbook-en/listings/ch17-async-await/no-listing-state-machine/output.txt
new file mode 100644
index 000000000..10a18bc48
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/no-listing-state-machine/output.txt
@@ -0,0 +1,2 @@
+$ cargo run
+error: a bin target must be available for `cargo run`
diff --git a/rustbook-en/listings/ch17-async-await/no-listing-state-machine/src/lib.rs b/rustbook-en/listings/ch17-async-await/no-listing-state-machine/src/lib.rs
new file mode 100644
index 000000000..127328314
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/no-listing-state-machine/src/lib.rs
@@ -0,0 +1,9 @@
+extern crate trpl; // required for mdbook test
+
+// ANCHOR: enum
+enum PageTitleFuture<'a> {
+ Initial { url: &'a str },
+ GetAwaitPoint { url: &'a str },
+ TextAwaitPoint { response: trpl::Response },
+}
+// ANCHOR_END: enum
diff --git a/rustbook-en/listings/ch17-async-await/no-listing-stream-ext/Cargo.lock b/rustbook-en/listings/ch17-async-await/no-listing-stream-ext/Cargo.lock
new file mode 100644
index 000000000..d30b928a6
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/no-listing-stream-ext/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "async_await"
+version = "0.1.0"
diff --git a/rustbook-en/listings/ch17-async-await/no-listing-stream-ext/Cargo.toml b/rustbook-en/listings/ch17-async-await/no-listing-stream-ext/Cargo.toml
new file mode 100644
index 000000000..67729afc8
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/no-listing-stream-ext/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "async_await"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
diff --git a/rustbook-en/listings/ch17-async-await/no-listing-stream-ext/output.txt b/rustbook-en/listings/ch17-async-await/no-listing-stream-ext/output.txt
new file mode 100644
index 000000000..10a18bc48
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/no-listing-stream-ext/output.txt
@@ -0,0 +1,2 @@
+$ cargo run
+error: a bin target must be available for `cargo run`
diff --git a/rustbook-en/listings/ch17-async-await/no-listing-stream-ext/src/lib.rs b/rustbook-en/listings/ch17-async-await/no-listing-stream-ext/src/lib.rs
new file mode 100644
index 000000000..09a980c04
--- /dev/null
+++ b/rustbook-en/listings/ch17-async-await/no-listing-stream-ext/src/lib.rs
@@ -0,0 +1,20 @@
+use std::pin::Pin;
+use std::task::{Context, Poll};
+
+trait Stream {
+ type Item;
+ fn poll_next(
+ self: Pin<&mut Self>,
+ cx: &mut Context<'_>,
+ ) -> Poll>;
+}
+
+// ANCHOR: here
+trait StreamExt: Stream {
+ async fn next(&mut self) -> Option
+ where
+ Self: Unpin;
+
+ // other methods...
+}
+// ANCHOR_END: here
diff --git a/rustbook-en/listings/ch17-oop/listing-17-01/Cargo.lock b/rustbook-en/listings/ch18-oop/listing-18-01/Cargo.lock
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-01/Cargo.lock
rename to rustbook-en/listings/ch18-oop/listing-18-01/Cargo.lock
diff --git a/rustbook-en/listings/ch17-oop/listing-17-01/Cargo.toml b/rustbook-en/listings/ch18-oop/listing-18-01/Cargo.toml
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-01/Cargo.toml
rename to rustbook-en/listings/ch18-oop/listing-18-01/Cargo.toml
diff --git a/rustbook-en/listings/ch17-oop/listing-17-01/src/lib.rs b/rustbook-en/listings/ch18-oop/listing-18-01/src/lib.rs
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-01/src/lib.rs
rename to rustbook-en/listings/ch18-oop/listing-18-01/src/lib.rs
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similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-02/Cargo.lock
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diff --git a/rustbook-en/listings/ch17-oop/listing-17-02/Cargo.toml b/rustbook-en/listings/ch18-oop/listing-18-02/Cargo.toml
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-02/Cargo.toml
rename to rustbook-en/listings/ch18-oop/listing-18-02/Cargo.toml
diff --git a/rustbook-en/listings/ch17-oop/listing-17-02/src/lib.rs b/rustbook-en/listings/ch18-oop/listing-18-02/src/lib.rs
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-02/src/lib.rs
rename to rustbook-en/listings/ch18-oop/listing-18-02/src/lib.rs
diff --git a/rustbook-en/listings/ch17-oop/listing-17-03/Cargo.lock b/rustbook-en/listings/ch18-oop/listing-18-03/Cargo.lock
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-03/Cargo.lock
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diff --git a/rustbook-en/listings/ch17-oop/listing-17-03/Cargo.toml b/rustbook-en/listings/ch18-oop/listing-18-03/Cargo.toml
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-03/Cargo.toml
rename to rustbook-en/listings/ch18-oop/listing-18-03/Cargo.toml
diff --git a/rustbook-en/listings/ch17-oop/listing-17-03/src/lib.rs b/rustbook-en/listings/ch18-oop/listing-18-03/src/lib.rs
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-03/src/lib.rs
rename to rustbook-en/listings/ch18-oop/listing-18-03/src/lib.rs
diff --git a/rustbook-en/listings/ch17-oop/listing-17-04/Cargo.lock b/rustbook-en/listings/ch18-oop/listing-18-04/Cargo.lock
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-04/Cargo.lock
rename to rustbook-en/listings/ch18-oop/listing-18-04/Cargo.lock
diff --git a/rustbook-en/listings/ch17-oop/listing-17-04/Cargo.toml b/rustbook-en/listings/ch18-oop/listing-18-04/Cargo.toml
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-04/Cargo.toml
rename to rustbook-en/listings/ch18-oop/listing-18-04/Cargo.toml
diff --git a/rustbook-en/listings/ch17-oop/listing-17-04/src/lib.rs b/rustbook-en/listings/ch18-oop/listing-18-04/src/lib.rs
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-04/src/lib.rs
rename to rustbook-en/listings/ch18-oop/listing-18-04/src/lib.rs
diff --git a/rustbook-en/listings/ch17-oop/listing-17-05/Cargo.lock b/rustbook-en/listings/ch18-oop/listing-18-05/Cargo.lock
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-05/Cargo.lock
rename to rustbook-en/listings/ch18-oop/listing-18-05/Cargo.lock
diff --git a/rustbook-en/listings/ch17-oop/listing-17-05/Cargo.toml b/rustbook-en/listings/ch18-oop/listing-18-05/Cargo.toml
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-05/Cargo.toml
rename to rustbook-en/listings/ch18-oop/listing-18-05/Cargo.toml
diff --git a/rustbook-en/listings/ch17-oop/listing-17-05/src/lib.rs b/rustbook-en/listings/ch18-oop/listing-18-05/src/lib.rs
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-05/src/lib.rs
rename to rustbook-en/listings/ch18-oop/listing-18-05/src/lib.rs
diff --git a/rustbook-en/listings/ch17-oop/listing-17-06/Cargo.lock b/rustbook-en/listings/ch18-oop/listing-18-06/Cargo.lock
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-06/Cargo.lock
rename to rustbook-en/listings/ch18-oop/listing-18-06/Cargo.lock
diff --git a/rustbook-en/listings/ch17-oop/listing-17-06/Cargo.toml b/rustbook-en/listings/ch18-oop/listing-18-06/Cargo.toml
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-06/Cargo.toml
rename to rustbook-en/listings/ch18-oop/listing-18-06/Cargo.toml
diff --git a/rustbook-en/listings/ch17-oop/listing-17-06/src/lib.rs b/rustbook-en/listings/ch18-oop/listing-18-06/src/lib.rs
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-06/src/lib.rs
rename to rustbook-en/listings/ch18-oop/listing-18-06/src/lib.rs
diff --git a/rustbook-en/listings/ch17-oop/listing-17-07/Cargo.lock b/rustbook-en/listings/ch18-oop/listing-18-07/Cargo.lock
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-07/Cargo.lock
rename to rustbook-en/listings/ch18-oop/listing-18-07/Cargo.lock
diff --git a/rustbook-en/listings/ch17-oop/listing-17-07/Cargo.toml b/rustbook-en/listings/ch18-oop/listing-18-07/Cargo.toml
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-07/Cargo.toml
rename to rustbook-en/listings/ch18-oop/listing-18-07/Cargo.toml
diff --git a/rustbook-en/listings/ch17-oop/listing-17-07/src/lib.rs b/rustbook-en/listings/ch18-oop/listing-18-07/src/lib.rs
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-07/src/lib.rs
rename to rustbook-en/listings/ch18-oop/listing-18-07/src/lib.rs
diff --git a/rustbook-en/listings/ch17-oop/listing-17-08/Cargo.lock b/rustbook-en/listings/ch18-oop/listing-18-08/Cargo.lock
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-08/Cargo.lock
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diff --git a/rustbook-en/listings/ch17-oop/listing-17-08/Cargo.toml b/rustbook-en/listings/ch18-oop/listing-18-08/Cargo.toml
similarity index 100%
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diff --git a/rustbook-en/listings/ch17-oop/listing-17-08/src/lib.rs b/rustbook-en/listings/ch18-oop/listing-18-08/src/lib.rs
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-08/src/lib.rs
rename to rustbook-en/listings/ch18-oop/listing-18-08/src/lib.rs
diff --git a/rustbook-en/listings/ch17-oop/listing-17-08/src/main.rs b/rustbook-en/listings/ch18-oop/listing-18-08/src/main.rs
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-08/src/main.rs
rename to rustbook-en/listings/ch18-oop/listing-18-08/src/main.rs
diff --git a/rustbook-en/listings/ch17-oop/listing-17-09/Cargo.lock b/rustbook-en/listings/ch18-oop/listing-18-09/Cargo.lock
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-09/Cargo.lock
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similarity index 100%
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diff --git a/rustbook-en/listings/ch17-oop/listing-17-09/src/lib.rs b/rustbook-en/listings/ch18-oop/listing-18-09/src/lib.rs
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-09/src/lib.rs
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diff --git a/rustbook-en/listings/ch17-oop/listing-17-09/src/main.rs b/rustbook-en/listings/ch18-oop/listing-18-09/src/main.rs
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-09/src/main.rs
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similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-10/Cargo.lock
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similarity index 100%
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similarity index 100%
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similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-10/src/lib.rs
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similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-10/src/main.rs
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diff --git a/rustbook-en/listings/ch17-oop/listing-17-11/Cargo.lock b/rustbook-en/listings/ch18-oop/listing-18-11/Cargo.lock
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-11/Cargo.lock
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similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-11/Cargo.toml
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diff --git a/rustbook-en/listings/ch17-oop/listing-17-11/src/main.rs b/rustbook-en/listings/ch18-oop/listing-18-11/src/main.rs
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-11/src/main.rs
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diff --git a/rustbook-en/listings/ch17-oop/listing-17-12/Cargo.lock b/rustbook-en/listings/ch18-oop/listing-18-12/Cargo.lock
similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-12/Cargo.lock
rename to rustbook-en/listings/ch18-oop/listing-18-12/Cargo.lock
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similarity index 100%
rename from rustbook-en/listings/ch17-oop/listing-17-12/Cargo.toml
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similarity index 100%
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similarity index 100%
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similarity index 100%
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similarity index 100%
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similarity index 100%
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similarity index 100%
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similarity index 100%
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similarity index 100%
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similarity index 100%
rename from rustbook-en/listings/ch18-patterns-and-matching/listing-18-08/Cargo.toml
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diff --git a/rustbook-en/listings/ch18-patterns-and-matching/listing-18-08/output.txt b/rustbook-en/listings/ch19-patterns-and-matching/listing-19-08/output.txt
similarity index 96%
rename from rustbook-en/listings/ch18-patterns-and-matching/listing-18-08/output.txt
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index 6ce3dfc58..0ed34b716 100644
--- a/rustbook-en/listings/ch18-patterns-and-matching/listing-18-08/output.txt
+++ b/rustbook-en/listings/ch19-patterns-and-matching/listing-19-08/output.txt
@@ -7,7 +7,7 @@ error[E0005]: refutable pattern in local binding
| ^^^^^^^ pattern `None` not covered
|
= note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
- = note: for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
+ = note: for more information, visit https://doc.rust-lang.org/book/ch19-02-refutability.html
= note: the matched value is of type `Option`
help: you might want to use `let else` to handle the variant that isn't matched
|
diff --git a/rustbook-en/listings/ch18-patterns-and-matching/listing-18-08/src/main.rs b/rustbook-en/listings/ch19-patterns-and-matching/listing-19-08/src/main.rs
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similarity index 100%
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similarity index 100%
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similarity index 100%
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diff --git a/rustbook-en/nostarch/chapter17.md b/rustbook-en/nostarch/chapter17.md
index 946d20a11..af8698283 100644
--- a/rustbook-en/nostarch/chapter17.md
+++ b/rustbook-en/nostarch/chapter17.md
@@ -1,1233 +1,3008 @@
-
+## Async and Await
+
+Many operations we ask the computer to do can take a while to finish. For
+example, if you used a video editor to create a video of a family celebration,
+exporting it could take anywhere from minutes to hours. Similarly, downloading a
+video shared by someone in your family might take a long time. It would be nice
+if we could do something else while we are waiting for those long-running
+processes to complete.
+
+The video export will use as much CPU and GPU power as it can. If you only had
+one CPU core, and your operating system never paused that export until it
+completed, you couldn’t do anything else on your computer while it was running.
+That would be a pretty frustrating experience, though. Instead, your computer’s
+operating system can—and does!—invisibly interrupt the export often enough to
+let you get other work done along the way.
+
+The file download is different. It does not take up very much CPU time. Instead,
+the CPU needs to wait on data to arrive from the network. While you can start
+reading the data once some of it is present, it might take a while for the rest
+to show up. Even once the data is all present, a video can be quite large, so it
+might take some time to load it all. Maybe it only takes a second or two—but
+that’s a very long time for a modern processor, which can do billions of
+operations every second. It would be nice to be able to put the CPU to use for
+other work while waiting for the network call to finish—so, again, your
+operating system will invisibly interrupt your program so other things can
+happen while the network operation is still ongoing.
+
+> Note: The video export is the kind of operation which is often described as
+> “CPU-bound” or “compute-bound”. It’s limited by the speed of the computer’s
+> ability to process data within the *CPU* or *GPU*, and how much of that speed
+> it can use. The video download is the kind of operation which is often
+> described as “IO-bound,” because it’s limited by the speed of the computer’s
+> *input and output*. It can only go as fast as the data can be sent across the
+> network.
+
+In both of these examples, the operating system’s invisible interrupts provide a
+form of concurrency. That concurrency only happens at the level of a whole
+program, though: the operating system interrupts one program to let other
+programs get work done. In many cases, because we understand our programs at a
+much more granular level than the operating system does, we can spot lots of
+opportunities for concurrency that the operating system cannot see.
+
+For example, if we’re building a tool to manage file downloads, we should be
+able to write our program in such a way that starting one download does not lock
+up the UI, and users should be able to start multiple downloads at the same
+time. Many operating system APIs for interacting with the network are
+*blocking*, though. That is, these APIs block the program’s progress until the
+data that they are processing is completely ready.
+
+> Note: This is how *most* function calls work, if you think about it! However,
+> we normally reserve the term “blocking” for function calls which interact with
+> files, the network, or other resources on the computer, because those are the
+> places where an individual program would benefit from the operation being
+> *non*-blocking.
+
+We could avoid blocking our main thread by spawning a dedicated thread to
+download each file. However, we would eventually find that the overhead of those
+threads was a problem. It would also be nicer if the call were not blocking in
+the first place. Last but not least, it would be better if we could write in the
+same direct style we use in blocking code. Something similar to this:
-[TOC]
+```
+let data = fetch_data_from(url).await;
+println!("{data}");
+```
+
+That is exactly what Rust’s async abstraction gives us. Before we see how this
+works in practice, though, we need to take a short detour into the differences
+between parallelism and concurrency.
+
+### Parallelism and Concurrency
+
+In the “Fearless Concurrency” chapter on page XX, we treated parallelism and
+concurrency as mostly interchangeable. Now we need to distinguish between them
+more precisely, because the differences will show up as we start working.
+
+Consider the different ways a team could split up work on a software project. We
+could assign a single individual multiple tasks, or we could assign one task per
+team member, or we could do a mix of both approaches.
+
+When an individual works on several different tasks before any of them is
+complete, this is *concurrency*. Maybe you have two different projects checked
+out on your computer, and when you get bored or stuck on one project, you switch
+to the other. You’re just one person, so you can’t make progress on both tasks
+at the exact same time—but you can multi-task, making progress on multiple
+tasks by switching between them.
+
+
+
+Figure 17-1: A concurrent workflow, switching between Task A and Task B.
+
+When you agree to split up a group of tasks between the people on the team, with
+each person taking one task and working on it alone, this is *parallelism*. Each
+person on the team can make progress at the exact same time.
+
+
+
+Figure 17-2: A parallel workflow, where work happens on Task A and Task B
+independently.
-# Object-Oriented Programming Features
-
-Object-oriented programming (OOP) is a way of modeling programs. Objects as a
-programmatic concept were introduced in the programming language Simula in the
-1960s. Those objects influenced Alan Kay’s programming architecture in which
-objects pass messages to each other. To describe this architecture, he coined
-the term *object-oriented programming* in 1967. Many competing definitions
-describe what OOP is, and by some of these definitions Rust is object oriented
-but by others it is not. In this chapter, we’ll explore certain characteristics
-that are commonly considered object oriented and how those characteristics
-translate to idiomatic Rust. We’ll then show you how to implement an
-object-oriented design pattern in Rust and discuss the trade-offs of doing so
-versus implementing a solution using some of Rust’s strengths instead.
-
-## Characteristics of Object-Oriented Languages
-
-There is no consensus in the programming community about what features a
-language must have to be considered object oriented. Rust is influenced by many
-programming paradigms, including OOP; for example, we explored the features
-that came from functional programming in Chapter 13. Arguably, OOP languages
-share certain common characteristics, namely objects, encapsulation, and
-inheritance. Let’s look at what each of those characteristics means and whether
-Rust supports it.
-
-### Objects Contain Data and Behavior
-
-The book *Design Patterns: Elements of Reusable Object-Oriented Software* by
-Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides (Addison-Wesley,
-1994), colloquially referred to as *The Gang of Four* book, is a catalog of
-object-oriented design patterns. It defines OOP in this way:
-
-Object-oriented programs are made up of objects. An *object* packages both data
-and the procedures that operate on that data. The procedures are typically
-called *methods* or *operations*.
-
-Using this definition, Rust is object oriented: structs and enums have data,
-and `impl` blocks provide methods on structs and enums. Even though structs and
-enums with methods aren’t *called* objects, they provide the same
-functionality, according to the Gang of Four’s definition of objects.
-
-### Encapsulation That Hides Implementation Details
-
-Another aspect commonly associated with OOP is the idea of *encapsulation*,
-which means that the implementation details of an object aren’t accessible to
-code using that object. Therefore, the only way to interact with an object is
-through its public API; code using the object shouldn’t be able to reach into
-the object’s internals and change data or behavior directly. This enables the
-programmer to change and refactor an object’s internals without needing to
-change the code that uses the object.
-
-We discussed how to control encapsulation in Chapter 7: we can use the `pub`
-keyword to decide which modules, types, functions, and methods in our code
-should be public, and by default everything else is private. For example, we
-can define a struct `AveragedCollection` that has a field containing a vector
-of `i32` values. The struct can also have a field that contains the average of
-the values in the vector, meaning the average doesn’t have to be computed on
-demand whenever anyone needs it. In other words, `AveragedCollection` will
-cache the calculated average for us. Listing 17-1 has the definition of the
-`AveragedCollection` struct.
-
-Filename: src/lib.rs
-
-```
-pub struct AveragedCollection {
- list: Vec,
- average: f64,
+With both of these situations, you might have to coordinate between different
+tasks. Maybe you *thought* the task that one person was working on was totally
+independent from everyone else’s work, but it actually needs something finished
+by another person on the team. Some of the work could be done in parallel, but
+some of it was actually *serial*: it could only happen in a series, one thing
+after the other, as in Figure 17-3.
+
+
+
+Figure 17-3: A partially parallel workflow, where work happens on Task A and Task B independently until task A3 is blocked on the results of task B3.
+
+Likewise, you might realize that one of your own tasks depends on another of
+your tasks. Now your concurrent work has also become serial.
+
+Parallelism and concurrency can intersect with each other, too. If you learn
+that a colleague is stuck until you finish one of your tasks, you’ll probably
+focus all your efforts on that task to “unblock” your colleague. You and your
+coworker are no longer able to work in parallel, and you’re also no longer able
+to work concurrently on your own tasks.
+
+The same basic dynamics come into play with software and hardware. On a machine
+with a single CPU core, the CPU can only do one operation at a time, but it can
+still work concurrently. Using tools such as threads, processes, and async, the
+computer can pause one activity and switch to others before eventually cycling
+back to that first activity again. On a machine with multiple CPU cores, it can
+also do work in parallel. One core can be doing one thing while another core
+does something completely unrelated, and those actually happen at the same
+time.
+
+When working with async in Rust, we’re always dealing with concurrency.
+Depending on the hardware, the operating system, and the async runtime we are
+using—more on async runtimes shortly!—that concurrency may also use parallelism
+under the hood.
+
+Now, let’s dive into how async programming in Rust actually works! In the rest
+of this chapter, we will:
+
+* see how to use Rust’s `async` and `await` syntax
+* explore how to use the async model to solve some of the same challenges we
+ looked at in Chapter 16
+* look at how multithreading and async provide complementary solutions, which
+ you can even use together in many cases
+
+## Futures and the Async Syntax
+
+The key elements of asynchronous programming in Rust are *futures* and Rust’s
+`async` and `await` keywords.
+
+A *future* is a value which may not be ready now, but will become ready at some
+point in the future. (This same concept shows up in many languages, sometimes
+under other names such as “task” or “promise”.) Rust provides a `Future` trait
+as a building block so different async operations can be implemented with
+different data structures, but with a common interface. In Rust, we say that
+types which implement the `Future` trait are futures. Each type which
+implements `Future` holds its own information about the progress that has been
+made and what “ready” means.
+
+The `async` keyword can be applied to blocks and functions to specify that they
+can be interrupted and resumed. Within an async block or async function, you can
+use the `await` keyword to wait for a future to become ready, called *awaiting a
+future*. Each place you await a future within an async block or function is a
+place that async block or function may get paused and resumed. The process of
+checking with a future to see if its value is available yet is called *polling*.
+
+Some other languages also use `async` and `await` keywords for async
+programming. If you’re familiar with those languages, you may notice some
+significant differences in how Rust does things, including how it handles the
+syntax. That’s for good reason, as we’ll see!
+
+Most of the time when writing async Rust, we use the `async` and `await`
+keywords. Rust compiles them into equivalent code using the `Future` trait, much
+as it compiles `for` loops into equivalent code using the `Iterator` trait.
+Because Rust provides the `Future` trait, though, you can also implement it for
+your own data types when you need to. Many of the functions we’ll see
+throughout this chapter return types with their own implementations of `Future`.
+We’ll return to the definition of the trait at the end of the chapter and dig
+into more of how it works, but this is enough detail to keep us moving forward.
+
+That may all feel a bit abstract. Let’s write our first async program: a little
+web scraper. We’ll pass in two URLs from the command line, fetch both of them
+concurrently, and return the result of whichever one finishes first. This
+example will have a fair bit of new syntax, but don’t worry. We’ll explain
+everything you need to know as we go.
+
+### Our First Async Program
+
+To keep this chapter focused on learning async, rather than juggling parts of
+the ecosystem, we have created the `trpl` crate (`trpl` is short for “The Rust
+Programming Language”). It re-exports all the types, traits, and functions
+you’ll need, primarily from the `futures` and `tokio` crates, available on
+*https://crates.io*.
+
+* The `futures` crate is an official home for Rust experimentation for async
+ code, and is actually where the `Future` type was originally designed.
+
+* Tokio is the most widely used async runtime in Rust today, especially (but
+ not only!) for web applications. There are other great runtimes out there,
+ and they may be more suitable for your purposes. We use Tokio under the hood
+ for `trpl` because it’s well-tested and widely used.
+
+In some cases, `trpl` also renames or wraps the original APIs to let us stay
+focused on the details relevant to this chapter. If you want to understand what
+the crate does, we encourage you to check out its source code at
+*https://github.com/rust-lang/book/tree/main/packages/trpl*.
+You’ll be able to see what crate each re-export comes from, and we’ve left
+extensive comments explaining what the crate does.
+
+Create a new binary project named `hello-async` and add the `trpl` crate as a
+dependency:
+
+```
+$ cargo new hello-async
+$ cd hello-async
+$ cargo add trpl
+```
+
+Now we can use the various pieces provided by `trpl` to write our first async
+program. We’ll build a little command line tool which fetches two web pages,
+pulls the `` element from each, and prints out the title of whichever
+finishes that whole process first.
+
+Let’s start by writing a function that takes one page URL as a parameter, makes
+a request to it, and returns the text of the title element:
+
+Filename: src/main.rs
+
+```
+use trpl::Html;
+
+async fn page_title(url: &str) -> Option<String> {
+ let response = trpl::get(url).await;
+ let response_text = response.text().await;
+ Html::parse(&response_text)
+ .select_first("title")
+ .map(|title_element| title_element.inner_html())
}
```
-Listing 17-1: An `AveragedCollection` struct that maintains a list of integers
-and the average of the items in the collection
+Listing 17-1: Defining an async function to get the title element from an HTML page
+
+In Listing 17-1, we define a function named `page_title`, and we mark it with
+the `async` keyword. Then we use the `trpl::get` function to fetch whatever URL
+is passed in, and, and we await the response by using the `await` keyword. Then
+we get the text of the response by calling its `text` method and once again
+awaiting it with the `await` keyword. Both of these steps are asynchronous. For
+`get`, we need to wait for the server to send back the first part of its
+response, which will include HTTP headers, cookies, and so on. That part of the
+response can be delivered separately from the body of the request. Especially if
+the body is very large, it can take some time for it all to arrive. Thus, we
+have to wait for the *entirety* of the response to arrive, so the `text` method
+is also async.
+
+We have to explicitly await both of these futures, because futures in Rust are
+*lazy*: they don’t do anything until you ask them to with `await`. (In fact,
+Rust will show a compiler warning if you don’t use a future.) This should
+remind you of our discussion of iterators back in the “Processing a Series of
+Items with Iterators” section of Chapter 13 on page XX. Iterators do nothing
+unless you call their `next` method—whether directly, or using `for` loops or
+methods such as `map` which use `next` under the hood. With futures, the same
+basic idea applies: they do nothing unless you explicitly ask them to. This
+laziness allows Rust to avoid running async code until it’s actually needed.
+
+> Note: This is different from the behavior we saw when using `thread::spawn` in
+> the “Creating a New Thread with `spawn`” section of Chapter 16 on page XX,
+> where the closure we passed to another thread started running immediately.
+> It’s also different from how many other languages approach async! But it’s
+> important for Rust. We’ll see why that is later.
+
+Once we have `response_text`, we can then parse it into an instance of the
+`Html` type using `Html::parse`. Instead of a raw string, we now have a data
+type we can use to work with the HTML as a richer data structure. In particular,
+we can use the `select_first` method to find the first instance of a given CSS
+selector. By passing the string `"title"`, we’ll get the first `<title>`
+element in the document, if there is one. Because there may not be any matching
+element, `select_first` returns an `Option<ElementRef>`. Finally, we use the
+`Option::map` method, which lets us work with the item in the `Option` if it’s
+present, and do nothing if it isn’t. (We could also use a `match` expression
+here, but `map` is more idiomatic.) In the body of the function we supply to
+`map`, we call `inner_html` on the `title_element` to get its content, which is
+a `String`. When all is said and done, we have an `Option<String>`.
+
+Notice that Rust’s `await` keyword goes after the expression you’re awaiting,
+not before it. That is, it’s a *postfix keyword*. This may be different from
+what you might be used to if you have used async in other languages. Rust chose
+this because it makes chains of methods much nicer to work with. As a result, we
+can change the body of `page_url_for` to chain the `trpl::get` and `text`
+function calls together with `await` between them, as shown in Listing 17-2:
+
+Filename: src/main.rs
+
+```
+ let response_text = trpl::get(url).await.text().await;
+```
+
+Listing 17-2: Chaining with the `await` keyword
+
+With that, we have successfully written our first async function! Before we add
+some code in `main` to call it, let’s talk a little more about what we’ve
+written and what it means.
-The struct is marked `pub` so that other code can use it, but the fields within
-the struct remain private. This is important in this case because we want to
-ensure that whenever a value is added or removed from the list, the average is
-also updated. We do this by implementing `add`, `remove`, and `average` methods
-on the struct, as shown in Listing 17-2.
+When Rust sees a block marked with the `async` keyword, it compiles it into a
+unique, anonymous data type which implements the `Future` trait. When Rust sees
+a function marked with `async`, it compiles it into a non-async function whose
+body is an async block. An async function’s return type is the type of the of
+the anonymous data type the compiler creates for that async block.
-Filename: src/lib.rs
+Thus, writing `async fn` is equivalent to writing a function which returns a
+*future* of the return type. When the compiler sees a function definition such
+as the `async fn page_title` in Listing 17-1, it’s equivalent to a non-async
+function defined like this:
```
-impl AveragedCollection {
- pub fn add(&mut self, value: i32) {
- self.list.push(value);
- self.update_average();
+use std::future::Future;
+use trpl::Html;
+
+fn page_title(url: &str) -> impl Future<Output = Option<String>> + '_ {
+ async move {
+ let text = trpl::get(url).await.text().await;
+ Html::parse(&text)
+ .select_first("title")
+ .map(|title| title.inner_html())
}
+}
+```
- pub fn remove(&mut self) -> Option<i32> {
- let result = self.list.pop();
- match result {
- Some(value) => {
- self.update_average();
- Some(value)
- }
- None => None,
- }
- }
+Let’s walk through each part of the transformed version:
+
+* It uses the `impl Trait` syntax we discussed back in the “Traits as
+ Parameters” section in Chapter 10 on page XX.
+* The returned trait is a `Future`, with an associated type of `Output`. Notice
+ that the `Output` type is `Option<String>`, which is the same as the the
+ original return type from the `async fn` version of `page_title`.
+* All of the code called in the body of the original function is wrapped in an
+ `async move` block. Remember that blocks are expressions. This whole block is
+ the expression returned from the function.
+* This async block produces a value with the type `Option<String>`, as described
+ above. That value matches the `Output` type in the return type. This is just
+ like other blocks you have seen.
+* The new function body is an `async move` block because of how it uses the
+ `url` parameter. (We’ll talk about `async` vs. `async move` much more later
+ in the chapter.)
+* The new version of the function has a kind of lifetime we haven’t seen before
+ in the output type: `'_`. Because the function returns a `Future` which refers
+ to a reference—in this case, the reference from the `url` parameter—we need to
+ tell Rust that we mean for that reference to be included. We don’t have to
+ name the lifetime here, because Rust is smart enough to know there is only one
+ reference which could be involved, but we *do* have to be explicit that the
+ resulting `Future` is bound by that lifetime.
+
+Now we can call `page_title` in `main`. To start, we’ll just get the title for
+a single page. In Listing 17-3, we follow the same pattern we used for getting
+command line arguments back in the “Accepting Command Line Arguments” section
+of Chapter 12 on page XX. Then we pass the first URL `page_title`, and await
+the result. Because the value produced by the future is an `Option<String>`, we
+use a `match` expression to print different messages to account for whether the
+page had a `<title>`.
- pub fn average(&self) -> f64 {
- self.average
- }
+Filename: src/main.rs
- fn update_average(&mut self) {
- let total: i32 = self.list.iter().sum();
- self.average = total as f64 / self.list.len() as f64;
+```
+async fn main() {
+ let args: Vec<String> = std::env::args().collect();
+ let url = &args[1];
+ match page_title(url).await {
+ Some(title) => println!("The title for {url} was {title}"),
+ None => println!("{url} had no title"),
}
}
```
-Listing 17-2: Implementations of the public methods `add`, `remove`, and
-`average` on `AveragedCollection`
-
-The public methods `add`, `remove`, and `average` are the only ways to access
-or modify data in an instance of `AveragedCollection`. When an item is added to
-`list` using the `add` method or removed using the `remove` method, the
-implementations of each call the private `update_average` method that handles
-updating the `average` field as well.
-
-We leave the `list` and `average` fields private so there is no way for
-external code to add or remove items to or from the `list` field directly;
-otherwise, the `average` field might become out of sync when the `list`
-changes. The `average` method returns the value in the `average` field,
-allowing external code to read the `average` but not modify it.
-
-Because we’ve encapsulated the implementation details of the struct
-`AveragedCollection`, we can easily change aspects, such as the data structure,
-in the future. For instance, we could use a `HashSet<i32>` instead of a
-`Vec<i32>` for the `list` field. As long as the signatures of the `add`,
-`remove`, and `average` public methods stayed the same, code using
-`AveragedCollection` wouldn’t need to change. If we made `list` public instead,
-this wouldn’t necessarily be the case: `HashSet<i32>` and `Vec<i32>` have
-different methods for adding and removing items, so the external code would
-likely have to change if it were modifying `list` directly.
-
-If encapsulation is a required aspect for a language to be considered object
-oriented, then Rust meets that requirement. The option to use `pub` or not for
-different parts of code enables encapsulation of implementation details.
-
-### Inheritance as a Type System and as Code Sharing
-
-*Inheritance* is a mechanism whereby an object can inherit elements from
-another object’s definition, thus gaining the parent object’s data and behavior
-without you having to define them again.
-
-If a language must have inheritance to be object oriented, then Rust is not
-such a language. There is no way to define a struct that inherits the parent
-struct’s fields and method implementations without using a macro.
-
-However, if you’re used to having inheritance in your programming toolbox, you
-can use other solutions in Rust, depending on your reason for reaching for
-inheritance in the first place.
-
-You would choose inheritance for two main reasons. One is for reuse of code:
-you can implement particular behavior for one type, and inheritance enables you
-to reuse that implementation for a different type. You can do this in a limited
-way in Rust code using default trait method implementations, which you saw in
-Listing 10-14 when we added a default implementation of the `summarize` method
-on the `Summary` trait. Any type implementing the `Summary` trait would have
-the `summarize` method available on it without any further code. This is
-similar to a parent class having an implementation of a method and an
-inheriting child class also having the implementation of the method. We can
-also override the default implementation of the `summarize` method when we
-implement the `Summary` trait, which is similar to a child class overriding the
-implementation of a method inherited from a parent class.
-
-The other reason to use inheritance relates to the type system: to enable a
-child type to be used in the same places as the parent type. This is also
-called *polymorphism*, which means that you can substitute multiple objects for
-each other at runtime if they share certain characteristics.
-
-> ### Polymorphism
->
-> To many people, polymorphism is synonymous with inheritance. But it’s
-actually a more general concept that refers to code that can work with data of
-multiple types. For inheritance, those types are generally subclasses.
->
-> Rust instead uses generics to abstract over different possible types and
-trait bounds to impose constraints on what those types must provide. This is
-sometimes called *bounded parametric polymorphism*.
-
-Inheritance has recently fallen out of favor as a programming design solution
-in many programming languages because it’s often at risk of sharing more code
-than necessary. Subclasses shouldn’t always share all characteristics of their
-parent class but will do so with inheritance. This can make a program’s design
-less flexible. It also introduces the possibility of calling methods on
-subclasses that don’t make sense or that cause errors because the methods don’t
-apply to the subclass. In addition, some languages will only allow single
-inheritance (meaning a subclass can only inherit from one class), further
-restricting the flexibility of a program’s design.
-
-For these reasons, Rust takes the different approach of using trait objects
-instead of inheritance. Let’s look at how trait objects enable polymorphism in
-Rust.
-
-## Using Trait Objects That Allow for Values of Different Types
-
-In Chapter 8, we mentioned that one limitation of vectors is that they can
-store elements of only one type. We created a workaround in Listing 8-9 where
-we defined a `SpreadsheetCell` enum that had variants to hold integers, floats,
-and text. This meant we could store different types of data in each cell and
-still have a vector that represented a row of cells. This is a perfectly good
-solution when our interchangeable items are a fixed set of types that we know
-when our code is compiled.
-
-However, sometimes we want our library user to be able to extend the set of
-types that are valid in a particular situation. To show how we might achieve
-this, we’ll create an example graphical user interface (GUI) tool that iterates
-through a list of items, calling a `draw` method on each one to draw it to the
-screen—a common technique for GUI tools. We’ll create a library crate called
-`gui` that contains the structure of a GUI library. This crate might include
-some types for people to use, such as `Button` or `TextField`. In addition,
-`gui` users will want to create their own types that can be drawn: for
-instance, one programmer might add an `Image` and another might add a
-`SelectBox`.
-
-We won’t implement a full-fledged GUI library for this example but will show
-how the pieces would fit together. At the time of writing the library, we can’t
-know and define all the types other programmers might want to create. But we do
-know that `gui` needs to keep track of many values of different types, and it
-needs to call a `draw` method on each of these differently typed values. It
-doesn’t need to know exactly what will happen when we call the `draw` method,
-just that the value will have that method available for us to call.
-
-To do this in a language with inheritance, we might define a class named
-`Component` that has a method named `draw` on it. The other classes, such as
-`Button`, `Image`, and `SelectBox`, would inherit from `Component` and thus
-inherit the `draw` method. They could each override the `draw` method to define
-their custom behavior, but the framework could treat all of the types as if
-they were `Component` instances and call `draw` on them. But because Rust
-doesn’t have inheritance, we need another way to structure the `gui` library to
-allow users to extend it with new types.
-
-### Defining a Trait for Common Behavior
-
-To implement the behavior we want `gui` to have, we’ll define a trait named
-`Draw` that will have one method named `draw`. Then we can define a vector that
-takes a *trait object*. A trait object points to both an instance of a type
-implementing our specified trait and a table used to look up trait methods on
-that type at runtime. We create a trait object by specifying some sort of
-pointer, such as a `&` reference or a `Box<T>` smart pointer, then the `dyn`
-keyword, and then specifying the relevant trait. (We’ll talk about the reason
-trait objects must use a pointer in “Dynamically Sized Types and the Sized
-Trait” on page XX.) We can use trait objects in place of a generic or concrete
-type. Wherever we use a trait object, Rust’s type system will ensure at compile
-time that any value used in that context will implement the trait object’s
-trait. Consequently, we don’t need to know all the possible types at compile
-time.
+Listing 17-3: Calling the `page_title` function from `main` with a
+user-supplied argument
-We’ve mentioned that, in Rust, we refrain from calling structs and enums
-“objects” to distinguish them from other languages’ objects. In a struct or
-enum, the data in the struct fields and the behavior in `impl` blocks are
-separated, whereas in other languages, the data and behavior combined into one
-concept is often labeled an object. However, trait objects *are* more like
-objects in other languages in the sense that they combine data and behavior.
-But trait objects differ from traditional objects in that we can’t add data to
-a trait object. Trait objects aren’t as generally useful as objects in other
-languages: their specific purpose is to allow abstraction across common
-behavior.
+Unfortunately, this doesn’t compile. The only place we can use the `await`
+keyword is in async functions or blocks, and Rust won’t let us mark the
+special `main` function as `async`.
-Listing 17-3 shows how to define a trait named `Draw` with one method named
-`draw`.
+```
+error[E0752]: `main` function is not allowed to be `async`
+ --> src/main.rs:6:1
+ |
+6 | async fn main() {
+ | ^^^^^^^^^^^^^^^ `main` function is not allowed to be `async`
+```
+
+The reason `main` can’t be marked `async` is that async code needs a *runtime*:
+a Rust crate which manages the details of executing asynchronous code. A
+program’s `main` function can *initialize* a runtime, but it’s not a runtime
+*itself*. (We’ll see more about why this is a bit later.) Every Rust program
+that executes async code has at least one place where it sets up a runtime and
+executes the futures.
+
+Most languages which support async bundle a runtime with the language. Rust does
+not. Instead, there are many different async runtimes available, each of which
+makes different tradeoffs suitable to the use case they target. For example, a
+high-throughput web server with many CPU cores and a large amount of RAM has
+very different different needs than a microcontroller with a single core, a
+small amount of RAM, and no ability to do heap allocations. The crates which
+provide those runtimes also often supply async versions of common functionality
+such as file or network I/O.
+
+Here, and throughout the rest of this chapter, we’ll use the `run` function
+from the `trpl` crate, which takes a future as an argument and runs it to
+completion. Behind the scenes, calling `run` sets up a runtime to use to run the
+future passed in. Once the future completes, `run` returns whatever value the
+future produced.
+
+We could pass the future returned by `page_title` directly to `run`. Once it
+completed, we would be able to match on the resulting `Option<String>`, the way
+we tried to do in Listing 17-3. However, for most of the examples in the chapter
+(and most async code in the real world!), we’ll be doing more than just one
+async function call, so instead we’ll pass an `async` block and explicitly
+await the result of calling `page_title`, as in Listing 17-4.
-Filename: src/lib.rs
+Filename: src/main.rs
```
-pub trait Draw {
- fn draw(&self);
+fn main() {
+ let args: Vec<String> = std::env::args().collect();
+
+ trpl::run(async {
+ let url = &args[1];
+ match page_title(url).await {
+ Some(title) => println!("The title for {url} was {title}"),
+ None => println!("{url} had no title"),
+ }
+ })
}
```
-Listing 17-3: Definition of the `Draw` trait
+Listing 17-4: Awaiting an async block with `trpl::run`
+
+When we run this, we get the behavior we might have expected initially:
-This syntax should look familiar from our discussions on how to define traits
-in Chapter 10. Next comes some new syntax: Listing 17-4 defines a struct named
-`Screen` that holds a vector named `components`. This vector is of type
-`Box<dyn Draw>`, which is a trait object; it’s a stand-in for any type inside a
-`Box` that implements the `Draw` trait.
+```
+$ cargo run "http://www.rust-lang.org"
+The title for http://www.rust-lang.org was
+ Rust Programming Language
+```
-Filename: src/lib.rs
+Phew: we finally have some working async code! This now compiles, and we can run
+it. Before we add code to race two sites against each other, let’s briefly turn
+our attention back to how futures work.
+
+Each *await point*—that is, every place where the code uses the `await`
+keyword—represents a place where control gets handed back to the runtime. To
+make that work, Rust needs to keep track of the state involved in the async
+block, so that the runtime can kick off some other work and then come back when
+it’s ready to try advancing this one again. This is an invisible state machine,
+as if you wrote an enum in this way to save the current state at each `await`
+point:
```
-pub struct Screen {
- pub components: Vec<Box<dyn Draw>>,
+enum PageTitleFuture<'a> {
+ Initial { url: &'a str },
+ GetAwaitPoint { url: &'a str },
+ TextAwaitPoint { response: trpl::Response },
}
```
-Listing 17-4: Definition of the `Screen` struct with a `components` field
-holding a vector of trait objects that implement the `Draw` trait
-
-On the `Screen` struct, we’ll define a method named `run` that will call the
-`draw` method on each of its `components`, as shown in Listing 17-5.
+Writing the code to transition between each state by hand would be tedious and
+error-prone, especially when adding more functionality and more states to the
+code later. Instead, the Rust compiler creates and manages the state machine
+data structures for async code automatically. If you’re wondering: yep, the
+normal borrowing and ownership rules around data structures all apply. Happily,
+the compiler also handles checking those for us, and has good error messages.
+We’ll work through a few of those later in the chapter!
+
+Ultimately, something has to execute that state machine. That something is a
+runtime. (This is why you may sometimes come across references to *executors*
+when looking into runtimes: an executor is the part of a runtime responsible for
+executing the async code.)
+
+Now we can understand why the compiler stopped us from making `main` itself an
+async function back in Listing 17-3. If `main` were an async function, something
+else would need to manage the state machine for whatever future `main` returned,
+but `main` is the starting point for the program! Instead, we call the
+`trpl::run` function in `main`, which sets up a runtime and runs the future
+returned by the `async` block until it returns `Ready`.
+
+> Note: some runtimes provide macros to make it so you *can* write an async
+> main function. Those macros rewrite `async fn main() { ... }` to be a normal
+> `fn main` which does the same thing we did by hand in Listing 17-5: call a
+> function which runs a future to completion the way `trpl::run` does.
+
+Let’s put these pieces together and see how we can write concurrent code, by
+calling `page_title` with two different URLs passed in from the command line
+and racing them.
-Filename: src/lib.rs
+Filename: src/main.rs
```
-impl Screen {
- pub fn run(&self) {
- for component in self.components.iter() {
- component.draw();
+use trpl::{Either, Html};
+
+fn main() {
+ let args: Vec<String> = std::env::args().collect();
+
+ trpl::run(async {
+ let title_fut_1 = page_title(&args[1]);
+ let title_fut_2 = page_title(&args[2]);
+
+ let (url, maybe_title) =
+ match trpl::race(title_fut_1, title_fut_2).await {
+ Either::Left(left) => left,
+ Either::Right(right) => right,
+ };
+
+ println!("{url} returned first");
+ match maybe_title {
+ Some(title) => println!("Its page title is: '{title}'"),
+ None => println!("Its title could not be parsed."),
}
- }
+ })
+}
+
+async fn page_title(url: &str) -> (&str, Option<String>) {
+ let text = trpl::get(url).await.text().await;
+ let title = Html::parse(&text)
+ .select_first("title")
+ .map(|title| title.inner_html());
+ (url, title)
}
```
-Listing 17-5: A `run` method on `Screen` that calls the `draw` method on each
-component
+Listing 17-5: Calling `page_title` for two URLs to see which returns first
+
+In Listing 17-5, we begin by calling `page_title` for each of the user-supplied
+URLs. We save the futures produced by calling `page_title` as `title_fut_1` and
+`title_fut_2`. Remember, these don’t do anything yet, because futures are lazy,
+and we haven’t yet awaited them. Then we pass the futures to `trpl::race`,
+which returns a value to indicate which of the futures passed to it finishes
+first.
-This works differently from defining a struct that uses a generic type
-parameter with trait bounds. A generic type parameter can only be substituted
-with one concrete type at a time, whereas trait objects allow for multiple
-concrete types to fill in for the trait object at runtime. For example, we
-could have defined the `Screen` struct using a generic type and a trait bound,
-as in Listing 17-6.
+> Note: Under the hood, `race` is built on a more general function, `select`,
+> which you will encounter more often in real-world Rust code. A `select`
+> function can do a lot of things that `trpl::race` function can’t, but it also
+> has some additional complexity that we can skip over for now.
-Filename: src/lib.rs
+Either future can legitimately “win,” so it doesn’t make sense to return a
+`Result`. Instead, `race` returns a type we haven’t seen before,
+`trpl::Either`. The `Either` type is somewhat similar to a `Result`, in that it
+has two cases. Unlike `Result`, though, there is no notion of success or
+failure baked into `Either`. Instead, it uses `Left` and `Right` to indicate
+“one or the other”.
```
-pub struct Screen<T: Draw> {
- pub components: Vec<T>,
+enum Either<A, B> {
+ Left(A),
+ Right(B),
}
+```
-impl<T> Screen<T>
-where
- T: Draw,
-{
- pub fn run(&self) {
- for component in self.components.iter() {
- component.draw();
+The `race` function returns `Left` if the first argument finishes first, with
+that future’s output, and `Right` with the second future argument’s output if
+*that* one finishes first. This matches the order the arguments appear when
+calling the function: the first argument is to the left of the second argument.
+
+We also update `page_title` to return the same URL passed in. That way, if
+the page which returns first does not have a `<title>` we can resolve, we can
+still print a meaningful message. With that information available, we wrap up by
+updating our `println!` output to indicate both which URL finished first and
+what the `<title>` was for the web page at that URL, if any.
+
+You have built a small working web scraper now! Pick a couple URLs and run the
+command line tool. You may discover that some sites are reliably faster than
+others, while in other cases which site “wins” varies from run to run. More
+importantly, you’ve learned the basics of working with futures, so we can now
+dig into even more of the things we can do with async.
+
+## Concurrency With Async
+
+In this section, we’ll apply async to some of the same concurrency challenges
+we tackled with threads in Chapter 16. Because we already talked about a lot of
+the key ideas there, in this section we’ll focus on what’s different between
+threads and futures.
+
+In many cases, the APIs for working with concurrency using async are very
+similar to those for using threads. In other cases, they end up being shaped
+quite differently. Even when the APIs *look* similar between threads and async,
+they often have different behavior—and they nearly always have different
+performance characteristics.
+
+### Counting
+
+The first task we tackled in the “Creating a New Thread with spawn” section of
+Chapter 16 on page XX was counting up on two separate threads. Let’s do the
+same using async. The `trpl` crate supplies a `spawn_task` function which looks
+very similar to the `thread::spawn` API, and a `sleep` function which is an
+async version of the `thread::sleep` API. We can use these together to
+implement the same counting example as with threads, in Listing 17-6.
+
+Filename: src/main.rs
+
+```
+use std::time::Duration;
+
+fn main() {
+ trpl::run(async {
+ trpl::spawn_task(async {
+ for i in 1..10 {
+ println!("hi number {i} from the first task!");
+ trpl::sleep(Duration::from_millis(500)).await;
+ }
+ });
+
+ for i in 1..5 {
+ println!("hi number {i} from the second task!");
+ trpl::sleep(Duration::from_millis(500)).await;
}
- }
+ });
}
```
-Listing 17-6: An alternate implementation of the `Screen` struct and its `run`
-method using generics and trait bounds
+Listing 17-6: Using `spawn_task` to count with two
+
+As our starting point, we set up our `main` function with `trpl::run`, so
+that our top-level function can be async.
-This restricts us to a `Screen` instance that has a list of components all of
-type `Button` or all of type `TextField`. If you’ll only ever have homogeneous
-collections, using generics and trait bounds is preferable because the
-definitions will be monomorphized at compile time to use the concrete types.
+> Note: From this point forward in the chapter, every example will include this
+> exact same wrapping code with `trpl::run` in `main`, so we’ll often skip it
+> just as we do with `main`. Don’t forget to include it in your code!
-On the other hand, with the method using trait objects, one `Screen` instance
-can hold a `Vec<T>` that contains a `Box<Button>` as well as a
-`Box<TextField>`. Let’s look at how this works, and then we’ll talk about the
-runtime performance implications.
+Then we write two loops within that block, each with a `trpl::sleep` call in it,
+which waits for half a second (500 milliseconds) before sending the next
+message. We put one loop in the body of a `trpl::spawn_task` and the other in a
+top-level `for` loop. We also add an `await` after the `sleep` calls.
-### Implementing the Trait
+This does something similar to the thread-based implementation—including the
+fact that you may see the messages appear in a different order in your own
+terminal when you run it.
+
+```
+hi number 1 from the second task!
+hi number 1 from the first task!
+hi number 2 from the first task!
+hi number 2 from the second task!
+hi number 3 from the first task!
+hi number 3 from the second task!
+hi number 4 from the first task!
+hi number 4 from the second task!
+hi number 5 from the first task!
+```
-Now we’ll add some types that implement the `Draw` trait. We’ll provide the
-`Button` type. Again, actually implementing a GUI library is beyond the scope
-of this book, so the `draw` method won’t have any useful implementation in its
-body. To imagine what the implementation might look like, a `Button` struct
-might have fields for `width`, `height`, and `label`, as shown in Listing 17-7.
+This version stops as soon as the for loop in the body of the main async block
+finishes, because the task spawned by `spawn_task` is shut down when the main
+function ends. If you want to run all the way to the completion of the task, you
+will need to use a join handle to wait for the first task to complete. With
+threads, we used the `join` method to “block” until the thread was done running.
+In Listing 17-7, we can use `await` to do the same thing, because the task
+handle itself is a future. Its `Output` type is a `Result`, so we also unwrap it
+after awaiting it.
-Filename: src/lib.rs
+Filename: src/main.rs
```
-pub struct Button {
- pub width: u32,
- pub height: u32,
- pub label: String,
+let handle = trpl::spawn_task(async {
+ for i in 1..10 {
+ println!("hi number {i} from the first task!");
+ trpl::sleep(Duration::from_millis(500)).await;
+ }
+});
+
+for i in 1..5 {
+ println!("hi number {i} from the second task!");
+ trpl::sleep(Duration::from_millis(500)).await;
}
-impl Draw for Button {
- fn draw(&self) {
- // code to actually draw a button
+handle.await.unwrap();
+```
+
+Listing 17-7: Using `await` with a join handle to run a task to completion
+
+This updated version runs till *both* loops finish.
+
+```
+hi number 1 from the second task!
+hi number 1 from the first task!
+hi number 2 from the first task!
+hi number 2 from the second task!
+hi number 3 from the first task!
+hi number 3 from the second task!
+hi number 4 from the first task!
+hi number 4 from the second task!
+hi number 5 from the first task!
+hi number 6 from the first task!
+hi number 7 from the first task!
+hi number 8 from the first task!
+hi number 9 from the first task!
+```
+
+So far, it looks like async and threads give us the same basic outcomes, just
+with different syntax: using `await` instead of calling `join` on the join
+handle, and awaiting the `sleep` calls.
+
+The bigger difference is that we didn’t need to spawn another operating system
+thread to do this. In fact, we don’t even need to spawn a task here. Because
+async blocks compile to anonymous futures, we can put each loop in an async
+block and have the runtime run them both to completion using the `trpl::join`
+function.
+
+In the “Waiting for All Threads to Finish Using `join` Handles” section of
+Chapter 16 on page XX, we showed how to use the `join` method on the
+`JoinHandle` type returned when you call `std::thread::spawn`. The `trpl::join`
+function is similar, but for futures. When you give it two futures, it produces
+a single new future whose output is a tuple with the output of each of the
+futures you passed in once *both* complete. Thus, in Listing 17-8, we use
+`trpl::join` to wait for both `fut1` and `fut2` to finish. We do *not* await
+`fut1` and `fut2`, but instead the new future produced by `trpl::join`. We
+ignore the output, because it’s just a tuple with two unit values in it.
+
+Filename: src/main.rs
+
+```
+let fut1 = async {
+ for i in 1..10 {
+ println!("hi number {i} from the first task!");
+ trpl::sleep(Duration::from_millis(500)).await;
}
-}
+};
+
+let fut2 = async {
+ for i in 1..5 {
+ println!("hi number {i} from the second task!");
+ trpl::sleep(Duration::from_millis(500)).await;
+ }
+};
+
+trpl::join(fut1, fut2).await;
+```
+
+Listing 17-8: Using `trpl::join` to await two anonymous futures
+
+When we run this, we see both futures run to completion:
+
+```
+hi number 1 from the first task!
+hi number 1 from the second task!
+hi number 2 from the first task!
+hi number 2 from the second task!
+hi number 3 from the first task!
+hi number 3 from the second task!
+hi number 4 from the first task!
+hi number 4 from the second task!
+hi number 5 from the first task!
+hi number 6 from the first task!
+hi number 7 from the first task!
+hi number 8 from the first task!
+hi number 9 from the first task!
+```
+
+Here, you’ll see the exact same order every time, which is very different from
+what we saw with threads. That is because the `trpl::join` function is *fair*,
+meaning it checks each future equally often, alternating between them, and never
+lets one race ahead if the other is ready. With threads, the operating system
+decides which thread to check and how long to let it run. With async Rust, the
+runtime decides which task to check. (In practice, the details get complicated
+because an async runtime might use operating system threads under the hood as
+part of how it manages concurrency, so guaranteeing fairness can be more work
+for a runtime—but it’s still possible!) Runtimes don’t have to guarantee
+fairness for any given operation, and runtimes often offer different APIs to let
+you choose whether you want fairness or not.
+
+Try some of these different variations on awaiting the futures and see what they
+do:
+
+* Remove the async block from around either or both of the loops.
+* Await each async block immediately after defining it.
+* Wrap only the first loop in an async block, and await the resulting future
+ after the body of second loop.
+
+For an extra challenge, see if you can figure out what the output will be in
+each case *before* running the code!
+
+### Message Passing
+
+Sharing data between futures will also be familiar: we’ll use message passing
+again, but this with async versions of the types and functions. We’ll take a
+slightly different path than we did in the “Using Message Passing to Transfer
+Data Between Threads” section of Chapter 16 on page XX, to illustrate some of
+the key differences between thread-based and futures-based concurrency. In
+Listing 17-9, we’ll begin with just a single async block—*not* spawning a
+separate task as we spawned a separate thread.
+
+Filename: src/main.rs
+
```
+let (tx, mut rx) = trpl::channel();
-Listing 17-7: A `Button` struct that implements the `Draw` trait
+let val = String::from("hi");
+tx.send(val).unwrap();
-The `width`, `height`, and `label` fields on `Button` will differ from the
-fields on other components; for example, a `TextField` type might have those
-same fields plus a `placeholder` field. Each of the types we want to draw on
-the screen will implement the `Draw` trait but will use different code in the
-`draw` method to define how to draw that particular type, as `Button` has here
-(without the actual GUI code, as mentioned). The `Button` type, for instance,
-might have an additional `impl` block containing methods related to what
-happens when a user clicks the button. These kinds of methods won’t apply to
-types like `TextField`.
+let received = rx.recv().await.unwrap();
+println!("Got: {received}");
+```
-If someone using our library decides to implement a `SelectBox` struct that has
-`width`, `height`, and `options` fields, they would implement the `Draw` trait
-on the `SelectBox` type as well, as shown in Listing 17-8.
+Listing 17-9: Creating an async channel and assigning the two halves to `tx`
+and `rx`
+
+Here, we use `trpl::channel`, an async version of the multiple-producer,
+single-consumer channel API we used with threads back in the “Using Message
+Passing to Transfer Data Between Threads” section of Chapter 16 on page XX. The
+async version of the API is only a little different from the thread-based
+version: it uses a mutable rather than an immutable receiver `rx`, and its
+`recv` method produces a future we need to await rather than producing the
+value directly. Now we can send messages from the sender to the receiver.
+Notice that we don’t have to spawn a separate thread or even a task; we merely
+need to await the `rx.recv` call.
+
+The synchronous `Receiver::recv` method in `std::mpsc::channel` blocks until
+it receives a message. The `trpl::Receiver::recv` method does not, because it
+is async. Instead of blocking, it hands control back to the runtime until either
+a message is received or the send side of the channel closes. By contrast, we
+don’t await the `send` call, because it doesn’t block. It doesn’t need to,
+because the channel we’re sending it into is unbounded.
+
+> Note: Because all of this async code runs in an async block in a `trpl::run`
+> call, everything within it can avoid blocking. However, the code *outside* it
+> will block on the `run` function returning. That is the whole point of the
+> `trpl::run` function: it lets you *choose* where to block on some set of async
+> code, and thus where to transition between sync and async code. In most async
+> runtimes, `run` is actually named `block_on` for exactly this reason.
+
+Notice two things about this example: First, the message will arrive right away!
+Second, although we use a future here, there’s no concurrency yet. Everything
+in the listing happens in sequence, just as it would if there were no futures
+involved.
+
+Let’s address the first part by sending a series of messages, and sleep in
+between them, as shown in Listing 17-10:
Filename: src/main.rs
```
-use gui::Draw;
+let (tx, mut rx) = trpl::channel();
+
+let vals = vec![
+ String::from("hi"),
+ String::from("from"),
+ String::from("the"),
+ String::from("future"),
+];
+
+for val in vals {
+ tx.send(val).unwrap();
+ trpl::sleep(Duration::from_millis(500)).await;
+}
-struct SelectBox {
- width: u32,
- height: u32,
- options: Vec<String>,
+while let Some(value) = rx.recv().await {
+ println!("received '{value}'");
}
+```
+
+Listing 17-10: Sending and receiving multiple messages over the async channel
+and sleeping with an `await` between each message
+
+In addition to sending the messages, we need to receive them. In this case, we
+could do that manually, by just doing `rx.recv().await` four times, because we
+know how many messages are coming in. In the real world, though, we’ll
+generally be waiting on some *unknown* number of messages. In that case, we need
+to keep waiting until we determine that there are no more messages.
+
+In Listing 16-10, we used a `for` loop to process all the items received from a
+synchronous channel. However, Rust doesn’t yet have a way to write a `for` loop
+over an *asynchronous* series of items. Instead, we need to use a new kind of
+loop we haven’t seen before, the `while let` conditional loop. A `while let`
+loop is the loop version of the `if let` construct we saw back in the “Concise
+Control Flow with `if let`” section in Chapter 6 on page XX. The loop will
+continue executing as long as the pattern it specifies continues to match the
+value.
+
+The `rx.recv` call produces a `Future`, which we await. The runtime will pause
+the `Future` until it is ready. Once a message arrives, the future will resolve
+to `Some(message)`, as many times as a message arrives. When the channel closes,
+regardless of whether *any* messages have arrived, the future will instead
+resolve to `None` to indicate that there are no more values, and we should stop
+polling—that is, stop awaiting.
+
+The `while let` loop pulls all of this together. If the result of calling
+`rx.recv().await` is `Some(message)`, we get access to the message and we can
+use it in the loop body, just as we could with `if let`. If the result is
+`None`, the loop ends. Every time the loop completes, it hits the await point
+again, so the runtime pauses it again until another message arrives.
+
+The code now successfully sends and receives all of the messages. Unfortunately,
+there are still a couple problems. For one thing, the messages do not arrive at
+half-second intervals. They arrive all at once, two seconds (2,000 milliseconds)
+after we start the program. For another, this program also never exits! Instead,
+it waits forever for new messages. You will need to shut it down using <span
+class="keystroke">ctrl-c</span>.
+
+Let’s start by understanding why the messages all come in at once after the full
+delay, rather than coming in with delays in between each one. Within a given
+async block, the order that `await` keywords appear in the code is also the
+order they happen when running the program.
+
+There’s only one async block in Listing 17-10, so everything in it runs
+linearly. There’s still no concurrency. All the `tx.send` calls happen,
+interspersed with all of the `trpl::sleep` calls and their associated await
+points. Only then does the `while let` loop get to go through any of the `await`
+points on the `recv` calls.
+
+To get the behavior we want, where the sleep delay happens between receiving
+each message, we need to put the `tx` and `rx` operations in their own async
+blocks. Then the runtime can execute each of them separately using `trpl::join`,
+just as in the counting example. Once again, we await the result of calling
+`trpl::join`, not the individual futures. If we awaited the individual futures
+in sequence, we would just end up back in a sequential flow—exactly what we’re
+trying *not* to do.
+
+Filename: src/main.rs
-impl Draw for SelectBox {
- fn draw(&self) {
- // code to actually draw a select box
+```
+let tx_fut = async {
+ let vals = vec![
+ String::from("hi"),
+ String::from("from"),
+ String::from("the"),
+ String::from("future"),
+ ];
+
+ for val in vals {
+ tx.send(val).unwrap();
+ trpl::sleep(Duration::from_millis(500)).await;
}
-}
+};
+
+let rx_fut = async {
+ while let Some(value) = rx.recv().await {
+ println!("received '{value}'");
+ }
+};
+
+trpl::join(tx_fut, rx_fut).await;
+```
+
+Listing 17-11: Separating `send` and `recv` into their own `async` blocks and
+awaiting the futures for those blocks
+
+With the updated code in Listing 17-11, the messages get printed at
+500-millisecond intervals, rather than all in a rush after two seconds.
+
+The program still never exits, though, because of the way `while let` loop
+interacts with `trpl::join`:
+
+* The future returned from `trpl::join` only completes once *both* futures
+ passed to it have completed.
+* The `tx` future completes once it finishes sleeping after sending the last
+ message in `vals`.
+* The `rx` future won’t complete until the `while let` loop ends.
+* The `while let` loop won’t end until awaiting `rx.recv` produces `None`.
+* Awaiting `rx.recv` will only return `None` once the other end of the channel
+ is closed.
+* The channel will only close if we call `rx.close` or when the sender side,
+ `tx`, is dropped.
+* We don’t call `rx.close` anywhere, and `tx` won’t be dropped until the
+ outermost async block passed to `trpl::run` ends.
+* The block can’t end because it is blocked on `trpl::join` completing, which
+ takes us back to the top of this list!
+
+We could manually close `rx` by calling `rx.close` somewhere, but that doesn’t
+make much sense. Stopping after handling some arbitrary number of messages would
+make the program shut down, but we could miss messages. We need some other way
+to make sure that `tx` gets dropped *before* the end of the function.
+
+Right now, the async block where we send the messages only borrows `tx` because
+sending a message doesn’t require ownership, but if we could move `tx` into
+that async block, it would be dropped once that block ends. In the “Capturing
+References or Moving Ownership” section of Chapter 13 on page XX, we learned
+how to use the `move` keyword with closures, and in the “Using `move` Closures
+with Threads” section of Chapter 16 on page XX, we saw that we often need to
+move data into closures when working with threads. The same basic dynamics
+apply to async blocks, so the `move` keyword works with async blocks just as it
+does with closures.
+
+In Listing 17-12, we change the async block for sending messages from a plain
+`async` block to an `async move` block. When we run *this* version of the code,
+it shuts down gracefully after the last message is sent and received.
+
+Filename: src/main.rs
+
+```
+let (tx, mut rx) = trpl::channel();
+
+let tx_fut = async move {
+ let vals = vec![
+ String::from("hi"),
+ String::from("from"),
+ String::from("the"),
+ String::from("future"),
+ ];
+
+ for val in vals {
+ tx.send(val).unwrap();
+ trpl::sleep(Duration::from_millis(500)).await;
+ }
+};
+
+let rx_fut = async {
+ while let Some(value) = rx.recv().await {
+ eprintln!("received '{value}'");
+ }
+};
+
+trpl::join(tx_fut, rx_fut).await;
```
-Listing 17-8: Another crate using `gui` and implementing the `Draw` trait on a
-`SelectBox` struct
+Listing 17-12: A working example of sending and receiving messages between
+futures which correctly shuts down when complete
+
+This async channel is also a multiple-producer channel, so we can call `clone`
+on `tx` if we want to send messages from multiple futures. In Listing 17-13, we
+clone `tx`, creating `tx1` outside the first async block. We move `tx1` into
+that block just as we did before with `tx`. Then, later, we move the original
+`tx` into a *new* async block, where we send more messages on a slightly slower
+delay. We happen to put this new async block after the async block for receiving
+messages, but it could go before it just as well. The key is the order of the
+futures are awaited in, not the order they are created in.
-Our library’s user can now write their `main` function to create a `Screen`
-instance. To the `Screen` instance, they can add a `SelectBox` and a `Button`
-by putting each in a `Box<T>` to become a trait object. They can then call the
-`run` method on the `Screen` instance, which will call `draw` on each of the
-components. Listing 17-9 shows this implementation.
+Both of the async blocks for sending messages need to be `async move` blocks, so
+that both `tx` and `tx1` get dropped when those blocks finish. Otherwise we’ll
+end up back in the same infinite loop we started out in. Finally, we switch from
+`trpl::join` to `trpl::join3` to handle the additional future.
Filename: src/main.rs
```
-use gui::{Button, Screen};
+let (tx, mut rx) = trpl::channel();
+
+let tx1 = tx.clone();
+let tx1_fut = async move {
+ let vals = vec![
+ String::from("hi"),
+ String::from("from"),
+ String::from("the"),
+ String::from("future"),
+ ];
+
+ for val in vals {
+ tx1.send(val).unwrap();
+ trpl::sleep(Duration::from_millis(500)).await;
+ }
+};
-fn main() {
- let screen = Screen {
- components: vec![
- Box::new(SelectBox {
- width: 75,
- height: 10,
- options: vec![
- String::from("Yes"),
- String::from("Maybe"),
- String::from("No"),
- ],
- }),
- Box::new(Button {
- width: 50,
- height: 10,
- label: String::from("OK"),
- }),
- ],
- };
-
- screen.run();
-}
+let rx_fut = async {
+ while let Some(value) = rx.recv().await {
+ println!("received '{value}'");
+ }
+};
+
+let tx_fut = async move {
+ let vals = vec![
+ String::from("more"),
+ String::from("messages"),
+ String::from("for"),
+ String::from("you"),
+ ];
+
+ for val in vals {
+ tx.send(val).unwrap();
+ trpl::sleep(Duration::from_millis(1500)).await;
+ }
+};
+
+trpl::join3(tx1_fut, tx_fut, rx_fut).await;
```
-Listing 17-9: Using trait objects to store values of different types that
-implement the same trait
+Listing 17-13: Using multiple producers with async blocks
+
+Now we see all the messages from both sending futures. Because the sending
+futures use slightly different delays after sending, the messages are also
+received at those different intervals.
-When we wrote the library, we didn’t know that someone might add the
-`SelectBox` type, but our `Screen` implementation was able to operate on the
-new type and draw it because `SelectBox` implements the `Draw` trait, which
-means it implements the `draw` method.
+```
+received 'hi'
+received 'more'
+received 'from'
+received 'the'
+received 'messages'
+received 'future'
+received 'for'
+received 'you'
+```
-This concept—of being concerned only with the messages a value responds to
-rather than the value’s concrete type—is similar to the concept of *duck
-typing* in dynamically typed languages: if it walks like a duck and quacks like
-a duck, then it must be a duck! In the implementation of `run` on `Screen` in
-Listing 17-5, `run` doesn’t need to know what the concrete type of each
-component is. It doesn’t check whether a component is an instance of a `Button`
-or a `SelectBox`, it just calls the `draw` method on the component. By
-specifying `Box<dyn Draw>` as the type of the values in the `components`
-vector, we’ve defined `Screen` to need values that we can call the `draw`
-method on.
+This is a good start, but it limits us to just a handful of futures: two with
+`join`, or three with `join3`. Let’s see how we might work with more futures.
-The advantage of using trait objects and Rust’s type system to write code
-similar to code using duck typing is that we never have to check whether a
-value implements a particular method at runtime or worry about getting errors
-if a value doesn’t implement a method but we call it anyway. Rust won’t compile
-our code if the values don’t implement the traits that the trait objects need.
+## Working With Any Number of Futures
-For example, Listing 17-10 shows what happens if we try to create a `Screen`
-with a `String` as a component.
+When we switched from using two futures to three in the previous section, we
+also had to switch from using `join` to using `join3`. It would be annoying to
+have to call a different function every time we changed the number of futures we
+wanted to join. Happily, we have a macro form of `join` to which we can pass an
+arbitrary number of arguments. It also handles awaiting the futures itself.
+Thus, we could rewrite the code from Listing 17-13 to use `join!` instead of
+`join3`, as in Listing 17-14:
Filename: src/main.rs
```
-use gui::Screen;
+trpl::join!(tx1_fut, tx_fut, rx_fut);
+```
-fn main() {
- let screen = Screen {
- components: vec![Box::new(String::from("Hi"))],
- };
+Listing 17-14: Using `join!` to wait for multiple futures
- screen.run();
-}
+This is definitely a nice improvement over needing to swap between `join` and
+`join3` and `join4` and so on! However, even this macro form only works when we
+know the number of futures ahead of time. In real-world Rust, though, pushing
+futures into a collection and then waiting on some or all the futures in that
+collection to complete is a common pattern.
+
+To check all the futures in some collection, we’ll need to iterate over and
+join on *all* of them. The `trpl::join_all` function accepts any type which
+implements the `Iterator` trait, which we learned about back in “The Iterator
+Trait and the next Method” section of Chapter 13 on page XX, so it seems like
+just the ticket. Let’s try putting our futures in a vector, and replace `join!`
+with `join_all`.
+
+```
+let futures = vec![tx1_fut, rx_fut, tx_fut];
+
+trpl::join_all(futures).await;
```
-Listing 17-10: Attempting to use a type that doesn’t implement the trait
-object’s trait
+Listing 17-15: Storing anonymous futures in a vector and calling `join_all`
-We’ll get this error because `String` doesn’t implement the `Draw` trait:
+Unfortunately, this doesn’t compile. Instead, we get this error:
```
-error[E0277]: the trait bound `String: Draw` is not satisfied
- --> src/main.rs:5:26
- |
-5 | components: vec![Box::new(String::from("Hi"))],
- | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Draw` is
-not implemented for `String`
- |
- = note: required for the cast to the object type `dyn Draw`
-```
-
-This error lets us know that either we’re passing something to `Screen` that we
-didn’t mean to pass and so should pass a different type, or we should implement
-`Draw` on `String` so that `Screen` is able to call `draw` on it.
-
-### Trait Objects Perform Dynamic Dispatch
-
-Recall in “Performance of Code Using Generics” on page XX our discussion on the
-monomorphization process performed by the compiler when we use trait bounds on
-generics: the compiler generates nongeneric implementations of functions and
-methods for each concrete type that we use in place of a generic type
-parameter. The code that results from monomorphization is doing *static
-dispatch*, which is when the compiler knows what method you’re calling at
-compile time. This is opposed to *dynamic dispatch*, which is when the compiler
-can’t tell at compile time which method you’re calling. In dynamic dispatch
-cases, the compiler emits code that at runtime will figure out which method to
-call.
-
-When we use trait objects, Rust must use dynamic dispatch. The compiler doesn’t
-know all the types that might be used with the code that’s using trait objects,
-so it doesn’t know which method implemented on which type to call. Instead, at
-runtime, Rust uses the pointers inside the trait object to know which method to
-call. This lookup incurs a runtime cost that doesn’t occur with static
-dispatch. Dynamic dispatch also prevents the compiler from choosing to inline a
-method’s code, which in turn prevents some optimizations. However, we did get
-extra flexibility in the code that we wrote in Listing 17-5 and were able to
-support in Listing 17-9, so it’s a trade-off to consider.
-
-## Implementing an Object-Oriented Design Pattern
-
-The *state pattern* is an object-oriented design pattern. The crux of the
-pattern is that we define a set of states a value can have internally. The
-states are represented by a set of *state objects*, and the value’s behavior
-changes based on its state. We’re going to work through an example of a blog
-post struct that has a field to hold its state, which will be a state object
-from the set “draft,” “review,” or “published.”
-
-The state objects share functionality: in Rust, of course, we use structs and
-traits rather than objects and inheritance. Each state object is responsible
-for its own behavior and for governing when it should change into another
-state. The value that holds a state object knows nothing about the different
-behavior of the states or when to transition between states.
-
-The advantage of using the state pattern is that, when the business
-requirements of the program change, we won’t need to change the code of the
-value holding the state or the code that uses the value. We’ll only need to
-update the code inside one of the state objects to change its rules or perhaps
-add more state objects.
-
-First we’re going to implement the state pattern in a more traditional
-object-oriented way, then we’ll use an approach that’s a bit more natural in
-Rust. Let’s dig in to incrementally implement a blog post workflow using the
-state pattern.
-
-The final functionality will look like this:
-
-1. A blog post starts as an empty draft.
-1. When the draft is done, a review of the post is requested.
-1. When the post is approved, it gets published.
-1. Only published blog posts return content to print, so unapproved posts can’t
-accidentally be published.
-
-Any other changes attempted on a post should have no effect. For example, if we
-try to approve a draft blog post before we’ve requested a review, the post
-should remain an unpublished draft.
-
-Listing 17-11 shows this workflow in code form: this is an example usage of the
-API we’ll implement in a library crate named `blog`. This won’t compile yet
-because we haven’t implemented the `blog` crate.
+error[E0308]: mismatched types
+ --> src/main.rs:43:37
+ |
+8 | let tx1_fut = async move {
+ | _______________________-
+9 | | let vals = vec![
+10 | | String::from("hi"),
+11 | | String::from("from"),
+... |
+19 | | }
+20 | | };
+ | |_________- the expected `async` block
+21 |
+22 | let rx_fut = async {
+ | ______________________-
+23 | | while let Some(value) = rx.recv().await {
+24 | | println!("received '{value}'");
+25 | | }
+26 | | };
+ | |_________- the found `async` block
+...
+43 | let futures = vec![tx1_fut, rx_fut, tx_fut];
+ | ^^^^^^ expected `async` block, found a different `async` block
+ |
+ = note: expected `async` block `{async block@src/main.rs:8:23: 20:10}`
+ found `async` block `{async block@src/main.rs:22:22: 26:10}`
+ = note: no two async blocks, even if identical, have the same type
+ = help: consider pinning your async block and and casting it to a trait object
+```
+
+This might be surprising. After all, none of them return anything, so each
+block produces a `Future<Output = ()>`. However, `Future` is a trait, not a
+concrete type. The concrete types are the individual data structures generated
+by the compiler for async blocks. You can’t put two different hand-written
+structs in a `Vec`, and the same thing applies to the different structs
+generated by the compiler.
+
+To make this work, we need to use *trait objects*, just as we did in the
+“Returning Errors from the run function” section in Chapter 12 on page XX.
+(We’ll cover trait objects in detail in Chapter 18.) Using trait objects lets
+us treat each of the anonymous futures produced by these types as the same
+type, because all of them implement the `Future` trait.
+
+> Note: In the “Using an Enum to Store Multiple Types” section of Chapter 8 on
+> page XX, we discussed another way to include multiple types in a `Vec`: using
+> an enum to represent each of the different types which can appear in the
+> vector. We can’t do that here, though. For one thing, we have no way to name
+> the different types, because they are anonymous. For another, the reason we
+> reached for a vector and `join_all` in the first place was to be able to work
+> with a dynamic collection of futures where we don’t know what they will all
+> be until runtime.
+
+We start by wrapping each of the futures in the `vec!` in a `Box::new`, as shown
+in Listing 17-16.
Filename: src/main.rs
```
-use blog::Post;
+let futures =
+ vec![Box::new(tx1_fut), Box::new(rx_fut), Box::new(tx_fut)];
-fn main() {
- 1 let mut post = Post::new();
+trpl::join_all(futures).await;
+```
- 2 post.add_text("I ate a salad for lunch today");
- 3 assert_eq!("", post.content());
+Listing 17-16: Trying to use `Box::new` to align the types of the futures in a
+`Vec`
- 4 post.request_review();
- 5 assert_eq!("", post.content());
+Unfortunately, this still doesn’t compile. In fact, we have the same basic
+error we did before, but we get one for both the second and third `Box::new`
+calls, and we also get new errors referring to the `Unpin` trait. We will come
+back to the `Unpin` errors in a moment. First, let’s fix the type errors on the
+`Box::new` calls, by explicitly annotating the type of the `futures` variable:
- 6 post.approve();
- 7 assert_eq!("I ate a salad for lunch today", post.content());
-}
+Filename: src/main.rs
+
+```
+let futures: Vec<Box<dyn Future<Output = ()>>> =
+ vec![Box::new(tx1_fut), Box::new(rx_fut), Box::new(tx_fut)];
```
-Listing 17-11: Code that demonstrates the desired behavior we want our `blog`
-crate to have
+Listing 17-17: Fixing the rest of the type mismatch errors by using an explicit
+type declaration
-We want to allow the user to create a new draft blog post with `Post::new` [1].
-We want to allow text to be added to the blog post [2]. If we try to get the
-post’s content immediately, before approval, we shouldn’t get any text because
-the post is still a draft. We’ve added `assert_eq!` in the code for
-demonstration purposes [3]. An excellent unit test for this would be to assert
-that a draft blog post returns an empty string from the `content` method, but
-we’re not going to write tests for this example.
+The type we had to write here is a little involved, so let’s walk through it:
-Next, we want to enable a request for a review of the post [4], and we want
-`content` to return an empty string while waiting for the review [5]. When the
-post receives approval [6], it should get published, meaning the text of the
-post will be returned when `content` is called [7].
+* The innermost type is the future itself. We note explicitly that the output of
+ the future is the unit type `()` by writing `Future<Output = ()>`.
+* Then we annotate the trait with `dyn` to mark it as dynamic.
+* The entire trait reference is wrapped in a `Box`.
+* Finally, we state explicitly that `futures` is a `Vec` containing these items.
-Notice that the only type we’re interacting with from the crate is the `Post`
-type. This type will use the state pattern and will hold a value that will be
-one of three state objects representing the various states a post can be
-in—draft, review, or published. Changing from one state to another will be
-managed internally within the `Post` type. The states change in response to the
-methods called by our library’s users on the `Post` instance, but they don’t
-have to manage the state changes directly. Also, users can’t make a mistake
-with the states, such as publishing a post before it’s reviewed.
+That already made a big difference. Now when we run the compiler, we only have
+the errors mentioning `Unpin`. Although there are three of them, notice that
+each is very similar in its contents.
-### Defining Post and Creating a New Instance in the Draft State
+```
+error[E0277]: `{async block@src/main.rs:8:23: 20:10}` cannot be unpinned
+ --> src/main.rs:46:24
+ |
+46 | trpl::join_all(futures).await;
+ | -------------- ^^^^^^^ the trait `Unpin` is not implemented for `{async block@src/main.rs:8:23: 20:10}`, which is required by `Box<{async block@src/main.rs:8:23: 20:10}>: std::future::Future`
+ | |
+ | required by a bound introduced by this call
+ |
+ = note: consider using the `pin!` macro
+ consider using `Box::pin` if you need to access the pinned value outside of the current scope
+ = note: required for `Box<{async block@src/main.rs:8:23: 20:10}>` to implement `std::future::Future`
+note: required by a bound in `join_all`
+ --> ~/.cargo/registry/src/index.crates.io-6f17d22bba15001f/futures-util-0.3.30/src/future/join_all.rs:105:14
+ |
+102 | pub fn join_all<I>(iter: I) -> JoinAll<I::Item>
+ | -------- required by a bound in this function
+...
+105 | I::Item: Future,
+ | ^^^^^^ required by this bound in `join_all`
+
+error[E0277]: `{async block@src/main.rs:8:23: 20:10}` cannot be unpinned
+ --> src/main.rs:46:9
+ |
+46 | trpl::join_all(futures).await;
+ | ^^^^^^^^^^^^^^^^^^^^^^^ the trait `Unpin` is not implemented for `{async block@src/main.rs:8:23: 20:10}`, which is required by `Box<{async block@src/main.rs:8:23: 20:10}>: std::future::Future`
+ |
+ = note: consider using the `pin!` macro
+ consider using `Box::pin` if you need to access the pinned value outside of the current scope
+ = note: required for `Box<{async block@src/main.rs:8:23: 20:10}>` to implement `std::future::Future`
+note: required by a bound in `JoinAll`
+ --> ~/.cargo/registry/src/index.crates.io-6f17d22bba15001f/futures-util-0.3.30/src/future/join_all.rs:29:8
+ |
+27 | pub struct JoinAll<F>
+ | ------- required by a bound in this struct
+28 | where
+29 | F: Future,
+ | ^^^^^^ required by this bound in `JoinAll`
+
+error[E0277]: `{async block@src/main.rs:8:23: 20:10}` cannot be unpinned
+ --> src/main.rs:46:33
+ |
+46 | trpl::join_all(futures).await;
+ | ^^^^^ the trait `Unpin` is not implemented for `{async block@src/main.rs:8:23: 20:10}`, which is required by `Box<{async block@src/main.rs:8:23: 20:10}>: std::future::Future`
+ |
+ = note: consider using the `pin!` macro
+ consider using `Box::pin` if you need to access the pinned value outside of the current scope
+ = note: required for `Box<{async block@src/main.rs:8:23: 20:10}>` to implement `std::future::Future`
+note: required by a bound in `JoinAll`
+ --> ~/.cargo/registry/src/index.crates.io-6f17d22bba15001f/futures-util-0.3.30/src/future/join_all.rs:29:8
+ |
+27 | pub struct JoinAll<F>
+ | ------- required by a bound in this struct
+28 | where
+29 | F: Future,
+ | ^^^^^^ required by this bound in `JoinAll`
+
+Some errors have detailed explanations: E0277, E0308.
+For more information about an error, try `rustc --explain E0277`.
+```
+
+That is a *lot* to digest, so let’s pull it apart. The first part of the message
+tell us that the first async block (`src/main.rs:8:23: 20:10`) does not
+implement the `Unpin` trait, and suggests using `pin!` or `Box::pin` to resolve
+it. Later in the chapter, we’ll dig into a few more details about `Pin` and
+`Unpin`. For the moment, though, we can just follow the compiler’s advice to get
+unstuck! In Listing 17-18, we start by updating the type annotation for
+`futures`, with a `Pin` wrapping each `Box`. Second, we use `Box::pin` to pin
+the futures themselves.
-Let’s get started on the implementation of the library! We know we need a
-public `Post` struct that holds some content, so we’ll start with the
-definition of the struct and an associated public `new` function to create an
-instance of `Post`, as shown in Listing 17-12. We’ll also make a private
-`State` trait that will define the behavior that all state objects for a `Post`
-must have.
+Filename: src/main.rs
-Then `Post` will hold a trait object of `Box<dyn State>` inside an `Option<T>`
-in a private field named `state` to hold the state object. You’ll see why the
-`Option<T>` is necessary in a bit.
+```
+let futures: Vec<Pin<Box<dyn Future<Output = ()>>>> =
+ vec![Box::pin(tx1_fut), Box::pin(rx_fut), Box::pin(tx_fut)];
+```
-Filename: src/lib.rs
+Listing 17-18: Using `Pin` and `Box::pin` to make the `Vec` type check
+
+If we compile and run this, we finally get the output we hoped for:
```
-pub struct Post {
- state: Option<Box<dyn State>>,
- content: String,
-}
+received 'hi'
+received 'more'
+received 'from'
+received 'messages'
+received 'the'
+received 'for'
+received 'future'
+received 'you'
+```
-impl Post {
- pub fn new() -> Post {
- Post {
- 1 state: Some(Box::new(Draft {})),
- 2 content: String::new(),
- }
- }
-}
+Phew!
+
+There’s a bit more we can explore here. For one thing, using `Pin<Box<T>>`
+comes with a small amount of extra overhead from putting these futures on the
+heap with `Box`—and we’re only doing that to get the types to line up. We don’t
+actually *need* the heap allocation, after all: these futures are local to this
+particular function. As noted above, `Pin` is itself a wrapper type, so we can
+get the benefit of having a single type in the `Vec`—the original reason we
+reached for `Box`—without doing a heap allocation. We can use `Pin` directly
+with each future, using the `std::pin::pin` macro.
-trait State {}
+However, we must still be explicit about the type of the pinned reference;
+otherwise Rust will still not know to interpret these as dynamic trait objects,
+which is what we need them to be in the `Vec`. We therefore `pin!` each future
+when we define it, and define `futures` as a `Vec` containing pinned mutable
+references to the dynamic `Future` type, as in Listing 17-19.
-struct Draft {}
+Filename: src/main.rs
-impl State for Draft {}
```
+let tx1_fut = pin!(async move {
+ // --snip--
+});
-Listing 17-12: Definition of a `Post` struct and a `new` function that creates
-a new `Post` instance, a `State` trait, and a `Draft` struct
+let rx_fut = pin!(async {
+ // --snip--
+});
-The `State` trait defines the behavior shared by different post states. The
-state objects are `Draft`, `PendingReview`, and `Published`, and they will all
-implement the `State` trait. For now, the trait doesn’t have any methods, and
-we’ll start by defining just the `Draft` state because that is the state we
-want a post to start in.
+let tx_fut = pin!(async move {
+ // --snip--
+});
-When we create a new `Post`, we set its `state` field to a `Some` value that
-holds a `Box` [1]. This `Box` points to a new instance of the `Draft` struct.
-This ensures that whenever we create a new instance of `Post`, it will start
-out as a draft. Because the `state` field of `Post` is private, there is no way
-to create a `Post` in any other state! In the `Post::new` function, we set the
-`content` field to a new, empty `String` [2].
+let futures: Vec<Pin<&mut dyn Future<Output = ()>>> =
+ vec![tx1_fut, rx_fut, tx_fut];
+```
-### Storing the Text of the Post Content
+Listing 17-19: Using `Pin` directly with the `pin!` macro to avoid unnecessary
+heap allocations
-We saw in Listing 17-11 that we want to be able to call a method named
-`add_text` and pass it a `&str` that is then added as the text content of the
-blog post. We implement this as a method, rather than exposing the `content`
-field as `pub`, so that later we can implement a method that will control how
-the `content` field’s data is read. The `add_text` method is pretty
-straightforward, so let’s add the implementation in Listing 17-13 to the `impl
-Post` block.
+We got this far by ignoring the fact that we might have different `Output`
+types. For example, in Listing 17-20, the anonymous future for `a` implements
+`Future<Output = u32>`, the anonymous future for `b` implements
+`Future<Output = &str>`, and the anonymous future for `c` implements
+`Future<Output = bool>`.
-Filename: src/lib.rs
+Filename: src/main.rs
```
-impl Post {
- --snip--
- pub fn add_text(&mut self, text: &str) {
- self.content.push_str(text);
- }
-}
+ let a = async { 1u32 };
+ let b = async { "Hello!" };
+ let c = async { true };
+
+ let (a_result, b_result, c_result) = trpl::join!(a, b, c);
+ println!("{a_result}, {b_result}, {c_result}");
```
-Listing 17-13: Implementing the `add_text` method to add text to a post’s
-`content`
+Listing 17-20: Three futures with distinct types
+
+We can use `trpl::join!` to await them, because it allows you to pass in
+multiple future types and produces a tuple of those types. We *cannot* use
+`trpl::join_all`, because it requires the futures passed in all to have the same
+type. Remember, that error is what got us started on this adventure with `Pin`!
-The `add_text` method takes a mutable reference to `self` because we’re
-changing the `Post` instance that we’re calling `add_text` on. We then call
-`push_str` on the `String` in `content` and pass the `text` argument to add to
-the saved `content`. This behavior doesn’t depend on the state the post is in,
-so it’s not part of the state pattern. The `add_text` method doesn’t interact
-with the `state` field at all, but it is part of the behavior we want to
-support.
+This is a fundamental tradeoff: we can either deal with a dynamic number of
+futures with `join_all`, as long as they all have the same type, or we can deal
+with a set number of futures with the `join` functions or the `join!` macro,
+even if they have different types. This is the same as working with any other
+types in Rust, though. Futures are not special, even though we have some nice
+syntax for working with them, and that is a good thing.
-### Ensuring the Content of a Draft Post Is Empty
+### Racing futures
-Even after we’ve called `add_text` and added some content to our post, we still
-want the `content` method to return an empty string slice because the post is
-still in the draft state, as shown at [3] in Listing 17-11. For now, let’s
-implement the `content` method with the simplest thing that will fulfill this
-requirement: always returning an empty string slice. We’ll change this later
-once we implement the ability to change a post’s state so it can be published.
-So far, posts can only be in the draft state, so the post content should always
-be empty. Listing 17-14 shows this placeholder implementation.
+When we “join” futures with the `join` family of functions and macros, we
+require *all* of them to finish before we move on. Sometimes, though, we only
+need *some* future from a set to finish before we move on—kind of similar to
+racing one future against another.
-Filename: src/lib.rs
+In Listing 17-21, we once again use `trpl::race` to run two futures, `slow` and
+`fast`, against each other. Each one prints a message when it starts running,
+pauses for some amount of time by calling and awaiting `sleep`, and then prints
+another message when it finishes. Then we pass both to `trpl::race` and wait for
+one of them to finish. (The outcome here won’t be too surprising: `fast` wins!)
+Unlike when we used `race` back in the “Our First Async Program” section of this
+chapter on page XX, we just ignore the `Either` instance it returns here,
+because all of the interesting behavior happens in the body of the async blocks.
+
+Filename: src/main.rs
```
-impl Post {
- --snip--
- pub fn content(&self) -> &str {
- ""
- }
+let slow = async {
+ println!("'slow' started.");
+ trpl::sleep(Duration::from_millis(100)).await;
+ println!("'slow' finished.");
+};
+
+let fast = async {
+ println!("'fast' started.");
+ trpl::sleep(Duration::from_millis(50)).await;
+ println!("'fast' finished.");
+};
+
+trpl::race(slow, fast).await;
+```
+
+Listing 17-21: Using `race` to get the result of whichever future finishes first
+
+Notice that if you flip the order of the arguments to `race`, the order of the
+“started” messages changes, even though the `fast` future always completes
+first. That’s because the implementation of this particular `race` function is
+not fair. It always runs the futures passed as arguments in the order they’re
+passed. Other implementations *are* fair, and will randomly choose which future
+to poll first. Regardless of whether the implementation of race we’re using is
+fair, though, *one* of the futures will run up to the first `await` in its body
+before another task can start.
+
+Recall from the “Our First Async Program” section of this chapter on page XX
+that at each await point, Rust gives a runtime a chance to pause the task and
+switch to another one if the future being awaited isn’t ready. The inverse is
+also true: Rust *only* pauses async blocks and hands control back to a runtime
+at an await point. Everything between await points is synchronous.
+
+That means if you do a bunch of work in an async block without an await point,
+that future will block any other futures from making progress. You may sometimes
+hear this referred to as one future *starving* other futures. In some cases,
+that may not be a big deal. However, if you are doing some kind of expensive
+setup or long-running work, or if you have a future which will keep doing some
+particular task indefinitely, you’ll need to think about when and where to
+hand control back to the runtime.
+
+By the same token, if you have long-running blocking operations, async can be a
+useful tool for providing ways for different parts of the program to relate to
+each other.
+
+But *how* would you hand control back to the runtime in those cases?
+
+### Yielding
+
+Let’s simulate a long-running operation. Listing 17-22 introduces a `slow`
+function. It uses `std::thread::sleep` instead of `trpl::sleep` so that calling
+`slow` will block the current thread for some number of milliseconds. We can use
+`slow` to stand in for real-world operations which are both long-running and
+blocking.
+
+Filename: src/main.rs
+
+```
+fn slow(name: &str, ms: u64) {
+ thread::sleep(Duration::from_millis(ms));
+ println!("'{name}' ran for {ms}ms");
}
```
-Listing 17-14: Adding a placeholder implementation for the `content` method on
-`Post` that always returns an empty string slice
+Listing 17-22: Using `thread::sleep` to simulate slow operations
+
+In Listing 17-23, we use `slow` to emulate doing this kind of CPU-bound work in
+a pair of futures. To begin, each future only hands control back to the runtime
+*after* carrying out a bunch of slow operations.
+
+Filename: src/main.rs
+
+```
+let a = async {
+ println!("'a' started.");
+ slow("a", 30);
+ slow("a", 10);
+ slow("a", 20);
+ trpl::sleep(Duration::from_millis(50)).await;
+ println!("'a' finished.");
+};
+
+let b = async {
+ println!("'b' started.");
+ slow("b", 75);
+ slow("b", 10);
+ slow("b", 15);
+ slow("b", 350);
+ trpl::sleep(Duration::from_millis(50)).await;
+ println!("'b' finished.");
+};
+
+trpl::race(a, b).await;
+```
+
+Listing 17-23: Using `thread::sleep` to simulate slow operations
+
+If you run this, you will see this output:
+
+```
+'a' started.
+'a' ran for 30ms
+'a' ran for 10ms
+'a' ran for 20ms
+'b' started.
+'b' ran for 75ms
+'b' ran for 10ms
+'b' ran for 15ms
+'b' ran for 350ms
+'a' finished.
+```
+
+As with our earlier example, `race` still finishes as soon as `a` is done.
+There’s no interleaving between the two futures, though. The `a` future does all
+of its work until the `trpl::sleep` call is awaited, then the `b` future does
+all of its work until its own `trpl::sleep` call is awaited, and then the `a`
+future completes. To allow both futures to make progress between their slow
+tasks, we need await points so we can hand control back to the runtime. That
+means we need something we can await!
-With this added `content` method, everything in Listing 17-11 up to the line at
-[3] works as intended.
+We can already see this kind of handoff happening in Listing 17-23: if we
+removed the `trpl::sleep` at the end of the `a` future, it would complete
+without the `b` future running *at all*. Maybe we could use the `sleep` function
+as a starting point?
-### Requesting a Review Changes the Post’s State
+Filename: src/main.rs
-Next, we need to add functionality to request a review of a post, which should
-change its state from `Draft` to `PendingReview`. Listing 17-15 shows this code.
+```
+let one_ms = Duration::from_millis(1);
+
+let a = async {
+ println!("'a' started.");
+ slow("a", 30);
+ trpl::sleep(one_ms).await;
+ slow("a", 10);
+ trpl::sleep(one_ms).await;
+ slow("a", 20);
+ trpl::sleep(one_ms).await;
+ println!("'a' finished.");
+};
+
+let b = async {
+ println!("'b' started.");
+ slow("b", 75);
+ trpl::sleep(one_ms).await;
+ slow("b", 10);
+ trpl::sleep(one_ms).await;
+ slow("b", 15);
+ trpl::sleep(one_ms).await;
+ slow("b", 35);
+ trpl::sleep(one_ms).await;
+ println!("'b' finished.");
+};
+```
-Filename: src/lib.rs
+Listing 17-24: Using `sleep` to let operations switch off making progress
+
+In Listing 17-24, we add `trpl::sleep` calls with await points between each call
+to `slow`. Now the two futures’ work is interleaved:
```
-impl Post {
- --snip--
- 1 pub fn request_review(&mut self) {
- 2 if let Some(s) = self.state.take() {
- 3 self.state = Some(s.request_review())
- }
+'a' started.
+'a' ran for 30ms
+'b' started.
+'b' ran for 75ms
+'a' ran for 10ms
+'b' ran for 10ms
+'a' ran for 20ms
+'b' ran for 15ms
+'a' finished.
+```
+
+The `a` future still runs for a bit before handing off control to `b`, because
+it calls `slow` before ever calling `trpl::sleep`, but after that the futures
+swap back and forth each time one of them hits an await point. In this case, we
+have done that after every call to `slow`, but we could break up the work
+however makes the most sense to us.
+
+We don’t really want to *sleep* here, though: we want to make progress as fast
+as we can. We just need to hand back control to the runtime. We can do that
+directly, using the `yield_now` function. In Listing 17-25, we replace all those
+`sleep` calls with `yield_now`.
+
+Filename: src/main.rs
+
+```
+let a = async {
+ println!("'a' started.");
+ slow("a", 30);
+ trpl::yield_now().await;
+ slow("a", 10);
+ trpl::yield_now().await;
+ slow("a", 20);
+ trpl::yield_now().await;
+ println!("'a' finished.");
+};
+
+let b = async {
+ println!("'b' started.");
+ slow("b", 75);
+ trpl::yield_now().await;
+ slow("b", 10);
+ trpl::yield_now().await;
+ slow("b", 15);
+ trpl::yield_now().await;
+ slow("b", 35);
+ trpl::yield_now().await;
+ println!("'b' finished.");
+};
+```
+
+Listing 17-25: Using `yield_now` to let operations switch off making progress
+
+This is both clearer about the actual intent and can be significantly faster
+than using `sleep`, because timers such as the one used by `sleep` often have
+limits to how granular they can be. The version of `sleep` we are using, for
+example, will always sleep for at least a millisecond, even if we pass it a
+`Duration` of one nanosecond. Again, modern computers are *fast*: they can do a
+lot in one millisecond!
+
+You can see this for yourself by setting up a little benchmark, such as the one
+in Listing 17-26. (This isn’t an especially rigorous way to do performance
+testing, but it suffices to show the difference here.) Here, we skip all the
+status printing, pass a one-nanosecond `Duration` to `trpl::sleep`, and let
+each future run by itself, with no switching between the futures. Then we run
+for 1,000 iterations and see how long the future using `trpl::sleep` takes
+compared to the future using `trpl::yield_now`.
+
+Filename: src/main.rs
+
+```
+let one_ns = Duration::from_nanos(1);
+let start = Instant::now();
+async {
+ for _ in 1..1000 {
+ trpl::sleep(one_ns).await;
}
}
-
-trait State {
- 4 fn request_review(self: Box<Self>) -> Box<dyn State>;
+.await;
+let time = Instant::now() - start;
+println!(
+ "'sleep' version finished after {} seconds.",
+ time.as_secs_f32()
+);
+
+let start = Instant::now();
+async {
+ for _ in 1..1000 {
+ trpl::yield_now().await;
+ }
}
+.await;
+let time = Instant::now() - start;
+println!(
+ "'yield' version finished after {} seconds.",
+ time.as_secs_f32()
+);
+```
+
+Listing 17-26: Comparing the performance of `sleep` and `yield_now`
+
+The version with `yield_now` is *way* faster!
+
+This means that async can be useful even for compute-bound tasks, depending on
+what else your program is doing, because it provides a useful tool for
+structuring the relationships between different parts of the program. This is a
+form of *cooperative multitasking*, where each future has both the power to
+determine when it hands over control via await points. Each future therefore
+also has the responsibility to avoid blocking for too long. In some Rust-based
+embedded operating systems, this is the *only* kind of multitasking!
-struct Draft {}
+In real-world code, you won’t usually be alternating function calls with await
+points on every single line, of course. While yielding control in this way is
+relatively inexpensive, it’s not free! In many cases, trying to break up a
+compute-bound task might make it significantly slower, so sometimes it’s better
+for *overall* performance to let an operation block briefly. You should always
+measure to see what your code’s actual performance bottlenecks are. The
+underlying dynamic is an important one to keep in mind if you *are* seeing a
+lot of work happening in serial that you expected to happen concurrently,
+though!
-impl State for Draft {
- fn request_review(self: Box<Self>) -> Box<dyn State> {
- 5 Box::new(PendingReview {})
+### Building Our Own Async Abstractions
+
+We can also compose futures together to create new patterns. For example, we can
+build a `timeout` function with async building blocks we already have. When
+we’re done, the result will be another building block we could use to build up
+yet further async abstractions.
+
+Listing 17-27 shows how we would expect this `timeout` to work with a slow
+future.
+
+Filename: src/main.rs
+
+```
+let slow = async {
+ trpl::sleep(Duration::from_millis(100)).await;
+ "I finished!"
+};
+
+match timeout(slow, Duration::from_millis(10)).await {
+ Ok(message) => println!("Succeeded with '{message}'"),
+ Err(duration) => {
+ println!("Failed after {} seconds", duration.as_secs())
}
}
+```
-struct PendingReview {}
+Listing 17-27: Using our imagined `timeout` to run a slow operation with a time
+limit
-impl State for PendingReview {
- fn request_review(self: Box<Self>) -> Box<dyn State> {
- 6 self
- }
+Let’s implement this! To begin, let’s think about the API for `timeout`:
+
+* It needs to be an async function itself so we can await it.
+* Its first parameter should be a future to run. We can make it generic to allow
+ it to work with any future.
+* Its second parameter will be the maximum time to wait. If we use a `Duration`,
+ that will make it easy to pass along to `trpl::sleep`.
+* It should return a `Result`. If the future completes successfully, the
+ `Result` will be `Ok` with the value produced by the future. If the timeout
+ elapses first, the `Result` will be `Err` with the duration that the timeout
+ waited for.
+
+Listing 17-28 shows this declaration.
+
+Filename: src/main.rs
+
+```
+async fn timeout<F: Future>(
+ future_to_try: F,
+ max_time: Duration,
+) -> Result<F::Output, Duration> {
+ // Here is where our implementation will go!
}
```
-Listing 17-15: Implementing `request_review` methods on `Post` and the `State`
-trait
-
-We give `Post` a public method named `request_review` that will take a mutable
-reference to `self` [1]. Then we call an internal `request_review` method on
-the current state of `Post` [3], and this second `request_review` method
-consumes the current state and returns a new state.
-
-We add the `request_review` method to the `State` trait [4]; all types that
-implement the trait will now need to implement the `request_review` method.
-Note that rather than having `self`, `&self`, or `&mut self` as the first
-parameter of the method, we have `self: Box<Self>`. This syntax means the
-method is only valid when called on a `Box` holding the type. This syntax takes
-ownership of `Box<Self>`, invalidating the old state so the state value of the
-`Post` can transform into a new state.
-
-To consume the old state, the `request_review` method needs to take ownership
-of the state value. This is where the `Option` in the `state` field of `Post`
-comes in: we call the `take` method to take the `Some` value out of the `state`
-field and leave a `None` in its place because Rust doesn’t let us have
-unpopulated fields in structs [2]. This lets us move the `state` value out of
-`Post` rather than borrowing it. Then we’ll set the post’s `state` value to the
-result of this operation.
-
-We need to set `state` to `None` temporarily rather than setting it directly
-with code like `self.state = self.state.request_review();` to get ownership of
-the `state` value. This ensures `Post` can’t use the old `state` value after
-we’ve transformed it into a new state.
-
-The `request_review` method on `Draft` returns a new, boxed instance of a new
-`PendingReview` struct [5], which represents the state when a post is waiting
-for a review. The `PendingReview` struct also implements the `request_review`
-method but doesn’t do any transformations. Rather, it returns itself [6]
-because when we request a review on a post already in the `PendingReview`
-state, it should stay in the `PendingReview` state.
-
-Now we can start seeing the advantages of the state pattern: the
-`request_review` method on `Post` is the same no matter its `state` value. Each
-state is responsible for its own rules.
-
-We’ll leave the `content` method on `Post` as is, returning an empty string
-slice. We can now have a `Post` in the `PendingReview` state as well as in the
-`Draft` state, but we want the same behavior in the `PendingReview` state.
-Listing 17-11 now works up to the line at [5]!
-
-### Adding approve to Change the Behavior of content
-
-The `approve` method will be similar to the `request_review` method: it will
-set `state` to the value that the current state says it should have when that
-state is approved, as shown in Listing 17-16.
-
-Filename: src/lib.rs
-
-```
-impl Post {
- --snip--
- pub fn approve(&mut self) {
- if let Some(s) = self.state.take() {
- self.state = Some(s.approve())
+Listing 17-28: Defining the signature of `timeout`
+
+That satisfies our goals for the types. Now let’s think about the *behavior* we
+need: we want to race the future passed in against the duration. We can use
+`trpl::sleep` to make a timer future from the duration, and use `trpl::race` to
+run that timer with the future the caller passes in.
+
+We also know that `race` is not fair, and polls arguments in the order they are
+passed. Thus, we pass `future_to_try` to `race` first so it gets a chance to
+complete even if `max_time` is a very short duration. If `future_to_try`
+finishes first, `race` will return `Left` with the output from `future`. If
+`timer` finishes first, `race` will return `Right` with the timer’s output of
+`()`.
+
+In Listing 17-29, we match on the result of awaiting `trpl::race`. If the
+`future_to_try` succeeded and we get a `Left(output)`, we return `Ok(output)`.
+If the sleep timer elapsed instead and we get a `Right(())`, we ignore the `()`
+with `_` and return `Err(max_time)` instead.
+
+Filename: src/main.rs
+
+```
+use trpl::Either;
+
+// --snip--
+
+fn main() {
+ trpl::run(async {
+ let slow = async {
+ trpl::sleep(Duration::from_secs(5)).await;
+ "Finally finished"
+ };
+
+ match timeout(slow, Duration::from_secs(2)).await {
+ Ok(message) => println!("Succeeded with '{message}'"),
+ Err(duration) => {
+ println!("Failed after {} seconds", duration.as_secs())
+ }
}
+ });
+}
+
+async fn timeout<F: Future>(
+ future_to_try: F,
+ max_time: Duration,
+) -> Result<F::Output, Duration> {
+ match trpl::race(future_to_try, trpl::sleep(max_time)).await {
+ Either::Left(output) => Ok(output),
+ Either::Right(_) => Err(max_time),
}
+```
+
+Listing 17-29: Defining `timeout` with `race` and `sleep`
+
+With that, we have a working `timeout`, built out of two other async helpers. If
+we run our code, it will print the failure mode after the timeout:
+
+```
+Failed after 2 seconds
+```
+
+Because futures compose with other futures, you can build really powerful tools
+using smaller async building blocks. For example, you can use this same
+approach to combine timeouts with retries, and in turn use those with things
+such as network calls—one of the examples from the beginning of the chapter!
+
+In practice, you will usually work directly with `async` and `await`, and
+secondarily with functions and macros such as `join`, `join_all`, `race`, and
+so on. You’ll only need to reach for `pin` now and again to use them with those
+APIs.
+
+We’ve now seen a number of ways to work with multiple futures at the same
+time. Up next, we’ll look at how we can work with multiple futures in a
+sequence over time, with *streams*. Here are a couple more things you might want
+to consider first, though:
+
+* We used a `Vec` with `join_all` to wait for all of the futures in some group
+ to finish. How could you use a `Vec` to process a group of futures in
+ sequence, instead? What are the tradeoffs of doing that?
+
+* Take a look at the `futures::stream::FuturesUnordered` type from the `futures`
+ crate. How would using it be different from using a `Vec`? (Don’t worry about
+ the fact that it is from the `stream` part of the crate; it works just fine
+ with any collection of futures.)
+
+## Streams
+
+So far in this chapter, we have mostly stuck to individual futures. The one big
+exception was the async channel we used. Recall how we used the receiver for
+our async channel in the “Message Passing” section of this chapter on page XX.
+The async `recv` method produces a sequence of items over time. This is an
+instance of a much more general pattern, often called a *stream*.
+
+A sequence of items is something we’ve seen before, when we looked at the
+`Iterator` trait in “The `Iterator` Trait and the `next` Method” section of
+Chapter 13 on page XX, but there are two differences between iterators and the
+async channel receiver. The first difference is the element of time: iterators
+are synchronous, while the channel receiver is asynchronous. The second
+difference is the API. When working directly with an `Iterator`, we call its
+synchronous `next` method. With the `trpl::Receiver` stream in particular, we
+called an asynchronous `recv` method instead, but these APIs otherwise feel
+very similar.
+
+That similarity isn’t a coincidence. A stream is similar to an asynchronous
+form of iteration. Whereas the `trpl::Receiver` specifically waits to receive
+messages, though, the general-purpose stream API is much more general: it
+provides the next item the way `Iterator` does, but asynchronously. The
+similarity between iterators and streams in Rust means we can actually create a
+stream from any iterator. As with an iterator, we can work with a stream by
+calling its `next` method and then awaiting the output, as in Listing 17-30.
+
+Filename: src/main.rs
+
+```
+let values = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+let iter = values.iter().map(|n| n * 2);
+let mut stream = trpl::stream_from_iter(iter);
+
+while let Some(value) = stream.next().await {
+ println!("The value was: {value}");
}
+```
+
+Listing 17-30: Creating a stream from an iterator and printing its values
+
+We start with an array of numbers, which we convert to an iterator and then call
+`map` on to double all the values. Then we convert the iterator into a stream
+using the `trpl::stream_from_iter` function. Then we loop over the items in the
+stream as they arrive with the `while let` loop.
-trait State {
- fn request_review(self: Box<Self>) -> Box<dyn State>;
- fn approve(self: Box<Self>) -> Box<dyn State>;
+Unfortunately, when we try to run the code, it doesn’t compile. Instead, as we
+can see in the output, it reports that there is no `next` method available.
+
+```
+error[E0599]: no method named `next` found for struct `Iter` in the current scope
+ --> src/main.rs:8:40
+ |
+8 | while let Some(value) = stream.next().await {
+ | ^^^^
+ |
+ = note: the full type name has been written to '~/projects/hello-async/target/debug/deps/async_await-bbd5bb8f6851cb5f.long-type-18426562901668632191.txt'
+ = note: consider using `--verbose` to print the full type name to the console
+ = help: items from traits can only be used if the trait is in scope
+help: the following traits which provide `next` are implemented but not in scope; perhaps you want to import one of them
+ |
+1 + use futures_util::stream::stream::StreamExt;
+ |
+1 + use std::iter::Iterator;
+ |
+1 + use std::str::pattern::Searcher;
+ |
+1 + use trpl::StreamExt;
+ |
+help: there is a method `try_next` with a similar name
+ |
+8 | while let Some(value) = stream.try_next().await {
+ | ~~~~~~~~
+
+For more information about this error, try `rustc --explain E0599`.
+```
+
+As the output suggests, the reason for the compiler error is that we need the
+right trait in scope to be able to use the `next` method. Given our discussion
+so far, you might reasonably expect that to be `Stream`, but the trait we need
+here is actually `StreamExt`. The `Ext` there is for “extension”: this is a
+common pattern in the Rust community for extending one trait with another.
+
+Why do we need `StreamExt` instead of `Stream`, and what does the `Stream` trait
+itself do? Briefly, the answer is that throughout the Rust ecosystem, the
+`Stream` trait defines a low-level interface which effectively combines the
+`Iterator` and `Future` traits. The `StreamExt` trait supplies a higher-level
+set of APIs on top of `Stream`, including the `next` method as well as other
+utility methods similar to those provided by the `Iterator` trait. We’ll return
+to the `Stream` and `StreamExt` traits in a bit more detail at the end of the
+chapter. For now, this is enough to let us keep moving.
+
+The fix to the compiler error is to add a `use` statement for `trpl::StreamExt`,
+as in Listing 17-31.
+
+Filename: src/main.rs
+
+```
+use trpl::StreamExt;
+
+fn main() {
+ trpl::run(async {
+ let values = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+ let iter = values.iter().map(|n| n * 2);
+ let mut stream = trpl::stream_from_iter(iter);
+
+ while let Some(value) = stream.next().await {
+ println!("The value was: {value}");
+ }
+ });
}
+```
-struct Draft {}
+Listing 17-31: Successfully using an iterator as the basis for a stream
-impl State for Draft {
- --snip--
- fn approve(self: Box<Self>) -> Box<dyn State> {
- 1 self
- }
+With all those pieces put together, this code works the way we want! What’s
+more, now that we have `StreamExt` in scope, we can use all of its utility
+methods, just as with iterators. For example, in Listing 17-32, we use the
+`filter` method to filter out everything but multiples of three and five.
+
+Filename: src/main.rs
+
+```
+use trpl::StreamExt;
+
+fn main() {
+ trpl::run(async {
+ let values = 1..101;
+ let iter = values.map(|n| n * 2);
+ let stream = trpl::stream_from_iter(iter);
+
+ let mut filtered =
+ stream.filter(|value| value % 3 == 0 || value % 5 == 0);
+
+ while let Some(value) = filtered.next().await {
+ println!("The value was: {value}");
+ }
+ });
}
+```
-struct PendingReview {}
+Listing 17-32: Filtering a `Stream` with the `StreamExt::filter` method
-impl State for PendingReview {
- --snip--
- fn approve(self: Box<Self>) -> Box<dyn State> {
- 2 Box::new(Published {})
- }
+Of course, this isn’t very interesting. We could do that with normal iterators
+and without any async at all. So let’s look at some of the other things we can
+do which are unique to streams.
+
+### Composing Streams
+
+Many concepts are naturally represented as streams: items becoming available in
+a queue, or working with more data than can fit in a computer’s memory by only
+pulling chunks of it from the file system at a time, or data arriving over the
+network over time. Because streams are futures, we can use them with any other
+kind of future, too, and we can combine them in interesting ways. For example,
+we can batch up events to avoid triggering too many network calls, set timeouts
+on sequences of long-running operations, or throttle user interface events to
+avoid doing needless work.
+
+Let’s start by building a little stream of messages, as a stand-in for a stream
+of data we might see from a WebSocket or another real-time communication
+protocol. In Listing 17-33, we create a function `get_messages` which returns
+`impl Stream<Item = String>`. For its implementation, we create an async
+channel, loop over the first ten letters of the English alphabet, and send them
+across the channel.
+
+We also use a new type: `ReceiverStream`, which converts the `rx` receiver from
+the `trpl::channel` into a `Stream` with a `next` method. Back in `main`, we use
+a `while let` loop to print all the messages from the stream.
+
+Filename: src/main.rs
+
+```
+use trpl::{ReceiverStream, Stream, StreamExt};
+
+fn main() {
+ trpl::run(async {
+ let mut messages = get_messages();
+
+ while let Some(message) = messages.next().await {
+ println!("{message}");
+ }
+ });
}
-struct Published {}
+fn get_messages() -> impl Stream<Item = String> {
+ let (tx, rx) = trpl::channel();
-impl State for Published {
- fn request_review(self: Box<Self>) -> Box<dyn State> {
- self
+ let messages = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"];
+ for message in messages {
+ tx.send(format!("Message: '{message}'")).unwrap();
}
- fn approve(self: Box<Self>) -> Box<dyn State> {
- self
- }
+ ReceiverStream::new(rx)
}
```
-Listing 17-16: Implementing the `approve` method on `Post` and the `State` trait
+Listing 17-33: Using the `rx` receiver as a `ReceiverStream`
-We add the `approve` method to the `State` trait and add a new struct that
-implements `State`, the `Published` state.
+When we run this code, we get exactly the results we would expect:
-Similar to the way `request_review` on `PendingReview` works, if we call the
-`approve` method on a `Draft`, it will have no effect because `approve` will
-return `self` [1]. When we call `approve` on `PendingReview`, it returns a new,
-boxed instance of the `Published` struct [2]. The `Published` struct implements
-the `State` trait, and for both the `request_review` method and the `approve`
-method, it returns itself because the post should stay in the `Published` state
-in those cases.
+```
+Message: 'a'
+Message: 'b'
+Message: 'c'
+Message: 'd'
+Message: 'e'
+Message: 'f'
+Message: 'g'
+Message: 'h'
+Message: 'i'
+Message: 'j'
+```
-Now we need to update the `content` method on `Post`. We want the value
-returned from `content` to depend on the current state of the `Post`, so we’re
-going to have the `Post` delegate to a `content` method defined on its `state`,
-as shown in Listing 17-17.
+We could do this with the regular `Receiver` API, or even the regular `Iterator`
+API, though. Let’s add something that requires streams: adding a timeout
+which applies to every item in the stream, and a delay on the items we emit.
-Filename: src/lib.rs
+In Listing 17-34, we start by adding a timeout to the stream with the `timeout`
+method, which comes from the `StreamExt` trait. Then we update the body of the
+`while let` loop, because the stream now returns a `Result`. The `Ok` variant
+indicates a message arrived in time; the `Err` variant indicates that the
+timeout elapsed before any message arrived. We `match` on that result and either
+print the message when we receive it successfully, or print a notice about the
+timeout. Finally, notice that we pin the messages after applying the timeout to
+them, because the timeout helper produces a future which needs to be pinned to
+be polled.
+
+Filename: src/main.rs
```
-impl Post {
- --snip--
- pub fn content(&self) -> &str {
- self.state.as_ref().unwrap().content(self)
- }
- --snip--
+use std::{pin::pin, time::Duration};
+use trpl::{ReceiverStream, Stream, StreamExt};
+
+fn main() {
+ trpl::run(async {
+ let mut messages =
+ pin!(get_messages().timeout(Duration::from_millis(200)));
+
+ while let Some(result) = messages.next().await {
+ match result {
+ Ok(message) => println!("{message}"),
+ Err(reason) => eprintln!("Problem: {reason:?}"),
+ }
+ }
+ })
}
```
-Listing 17-17: Updating the `content` method on `Post` to delegate to a
-`content` method on `State`
+Listing 17-34: Using the `StreamExt::timeout` method to set a time limit on the
+items in a stream
-Because the goal is to keep all of these rules inside the structs that
-implement `State`, we call a `content` method on the value in `state` and pass
-the post instance (that is, `self`) as an argument. Then we return the value
-that’s returned from using the `content` method on the `state` value.
+However, because there are no delays between messages, this timeout does not
+change the behavior of the program. Let’s add a variable delay to the messages
+we send. In `get_messages`, we use the `enumerate` iterator method with the
+`messages` array so that we can get the index of each item we are sending along
+with the item itself. Then we apply a 100 millisecond delay to even-index items
+and a 300 millisecond delay to odd-index items, to simulate the different delays
+we might see from a stream of messages in the real world. Because our timeout is
+for 200 milliseconds, this should affect half of the messages.
-We call the `as_ref` method on the `Option` because we want a reference to the
-value inside the `Option` rather than ownership of the value. Because `state`
-is an `Option<Box<dyn State>>`, when we call `as_ref`, an `Option<&Box<dyn
-State>>` is returned. If we didn’t call `as_ref`, we would get an error because
-we can’t move `state` out of the borrowed `&self` of the function parameter.
+Filename: src/main.rs
-We then call the `unwrap` method, which we know will never panic because we
-know the methods on `Post` ensure that `state` will always contain a `Some`
-value when those methods are done. This is one of the cases we talked about in
-“Cases in Which You Have More Information Than the Compiler” on page XX when we
-know that a `None` value is never possible, even though the compiler isn’t able
-to understand that.
+```
+fn get_messages() -> impl Stream<Item = String> {
+ let (tx, rx) = trpl::channel();
-At this point, when we call `content` on the `&Box<dyn State>`, deref coercion
-will take effect on the `&` and the `Box` so the `content` method will
-ultimately be called on the type that implements the `State` trait. That means
-we need to add `content` to the `State` trait definition, and that is where
-we’ll put the logic for what content to return depending on which state we
-have, as shown in Listing 17-18.
+ trpl::spawn_task(async move {
+ let messages = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"];
+ for (index, message) in messages.into_iter().enumerate() {
+ let time_to_sleep = if index % 2 == 0 { 100 } else { 300 };
+ trpl::sleep(Duration::from_millis(time_to_sleep)).await;
-Filename: src/lib.rs
+ tx.send(format!("Message: '{message}'")).unwrap();
+ }
+ });
-```
-trait State {
- --snip--
- fn content<'a>(&self, post: &'a Post) -> &'a str {
- 1 ""
- }
+ ReceiverStream::new(rx)
}
+```
---snip--
-struct Published {}
+Listing 17-35: Sending messages through `tx` with an async delay without making
+`get_messages` an async function
+
+To sleep between messages in the `get_messages` function without blocking, we
+need to use async. However, we can’t make `get_messages` itself into an async
+function, because then we’d return a `Future<Output = Stream<Item = String>>`
+instead of a `Stream<Item = String>>`. The caller would have to await
+`get_messages` itself to get access to the stream. But remember: everything in a
+given future happens linearly; concurrency happens *between* futures. Awaiting
+`get_messages` would require it to send all the messages, including sleeping
+between sending each message, before returning the receiver stream. As a result,
+the timeout would end up useless. There would be no delays in the stream itself:
+the delays would all happen before the stream was even available.
+
+Instead, we leave `get_messages` as a regular function which returns a stream,
+and spawn a task to handle the async `sleep` calls.
+
+> Note: calling `spawn_task` in this way works because we already set up our
+> runtime. Calling this particular implementation of `spawn_task` *without*
+> first setting up a runtime will cause a panic. Other implementations choose
+> different tradeoffs: they might spawn a new runtime and so avoid the panic but
+> end up with a bit of extra overhead, or simply not provide a standalone way to
+> spawn tasks without reference to a runtime. You should make sure you know what
+> tradeoff your runtime has chosen and write your code accordingly!
+
+Now our code has a much more interesting result! Between every other pair of
+messages, we see an error reported: `Problem: Elapsed(())`.
-impl State for Published {
- --snip--
- fn content<'a>(&self, post: &'a Post) -> &'a str {
- 2 &post.content
- }
+```
+Message: 'a'
+Problem: Elapsed(())
+Message: 'b'
+Message: 'c'
+Problem: Elapsed(())
+Message: 'd'
+Message: 'e'
+Problem: Elapsed(())
+Message: 'f'
+Message: 'g'
+Problem: Elapsed(())
+Message: 'h'
+Message: 'i'
+Problem: Elapsed(())
+Message: 'j'
+```
+
+The timeout doesn’t prevent the messages from arriving in the end—we still get
+all of the original messages. This is because our channel is unbounded: it can
+hold as many messages as we can fit in memory. If the message doesn’t arrive
+before the timeout, our stream handler will account for that, but when it polls
+the stream again, the message may now have arrived.
+
+You can get different behavior if needed by using other kinds of channels, or
+other kinds of streams more generally. Let’s see one of those in practice in our
+final example for this section, by combining a stream of time intervals with
+this stream of messages.
+
+### Merging Streams
+
+First, let’s create another stream, which will emit an item every millisecond if
+we let it run directly. For simplicity, we can use the `sleep` function to send
+a message on a delay, and combine it with the same approach of creating a stream
+from a channel we used in `get_messages`. The difference is that this time,
+we’re going to send back the count of intervals which has elapsed, so the return
+type will be `impl Stream<Item = u32>`, and we can call the function
+`get_intervals`.
+
+In Listing 17-36, we start by defining a `count` in the task. (We could define
+it outside the task, too, but it is clearer to limit the scope of any given
+variable.) Then we create an infinite loop. Each iteration of the loop
+asynchronously sleeps for one millisecond, increments the count, and then sends
+it over the channel. Because this is all wrapped in the task created by
+`spawn_task`, all of it will get cleaned up along with the runtime, including
+the infinite loop.
+
+Filename: src/main.rs
+
+```
+fn get_intervals() -> impl Stream<Item = u32> {
+ let (tx, rx) = trpl::channel();
+
+ trpl::spawn_task(async move {
+ let mut count = 0;
+ loop {
+ trpl::sleep(Duration::from_millis(1)).await;
+ count += 1;
+ tx.send(count).unwrap();
+ }
+ });
+
+ ReceiverStream::new(rx)
}
```
-Listing 17-18: Adding the `content` method to the `State` trait
+Listing 17-36: Creating a stream with a counter that will be emitted once every
+millisecond
-We add a default implementation for the `content` method that returns an empty
-string slice [1]. That means we don’t need to implement `content` on the
-`Draft` and `PendingReview` structs. The `Published` struct will override the
-`content` method and return the value in `post.content` [2].
+This kind of infinite loop, which only ends when the whole runtime gets torn
+down, is fairly common in async Rust: many programs need to keep running
+indefinitely. With async, this doesn’t block anything else, as long as there is
+at least one await point in each iteration through the loop.
-Note that we need lifetime annotations on this method, as we discussed in
-Chapter 10. We’re taking a reference to a `post` as an argument and returning a
-reference to part of that `post`, so the lifetime of the returned reference is
-related to the lifetime of the `post` argument.
+Back in our main function’s async block, we start by calling `get_intervals`.
+Then we merge the `messages` and `intervals` streams with the `merge` method,
+which combines multiple streams into one stream that produces items from any of
+the source streams as soon as the items are available, without imposing any
+particular ordering. Finally, we loop over that combined stream instead of over
+`messages` (Listing 17-37).
-And we’re done—all of Listing 17-11 now works! We’ve implemented the state
-pattern with the rules of the blog post workflow. The logic related to the
-rules lives in the state objects rather than being scattered throughout `Post`.
+Filename: src/main.rs
-> ### Why Not An Enum?
->
-> You may have been wondering why we didn’t use an `enum` with the different
-possible post states as variants. That’s certainly a possible solution; try it
-and compare the end results to see which you prefer! One disadvantage of using
-an enum is that every place that checks the value of the enum will need a
-`match` expression or similar to handle every possible variant. This could get
-more repetitive than this trait object solution.
-
-### Trade-offs of the State Pattern
-
-We’ve shown that Rust is capable of implementing the object-oriented state
-pattern to encapsulate the different kinds of behavior a post should have in
-each state. The methods on `Post` know nothing about the various behaviors. The
-way we organized the code, we have to look in only one place to know the
-different ways a published post can behave: the implementation of the `State`
-trait on the `Published` struct.
-
-If we were to create an alternative implementation that didn’t use the state
-pattern, we might instead use `match` expressions in the methods on `Post` or
-even in the `main` code that checks the state of the post and changes behavior
-in those places. That would mean we would have to look in several places to
-understand all the implications of a post being in the published state! This
-would only increase the more states we added: each of those `match` expressions
-would need another arm.
-
-With the state pattern, the `Post` methods and the places we use `Post` don’t
-need `match` expressions, and to add a new state, we would only need to add a
-new struct and implement the trait methods on that one struct.
-
-The implementation using the state pattern is easy to extend to add more
-functionality. To see the simplicity of maintaining code that uses the state
-pattern, try a few of these suggestions:
-
-* Add a `reject` method that changes the post’s state from `PendingReview` back
-to `Draft`.
-* Require two calls to `approve` before the state can be changed to `Published`.
-* Allow users to add text content only when a post is in the `Draft` state.
-Hint: have the state object responsible for what might change about the content
-but not responsible for modifying the `Post`.
-
-One downside of the state pattern is that, because the states implement the
-transitions between states, some of the states are coupled to each other. If we
-add another state between `PendingReview` and `Published`, such as `Scheduled`,
-we would have to change the code in `PendingReview` to transition to
-`Scheduled` instead. It would be less work if `PendingReview` didn’t need to
-change with the addition of a new state, but that would mean switching to
-another design pattern.
-
-Another downside is that we’ve duplicated some logic. To eliminate some of the
-duplication, we might try to make default implementations for the
-`request_review` and `approve` methods on the `State` trait that return `self`.
-However, this wouldn’t work: when using `State` as a trait object, the trait
-doesn’t know what the concrete `self` will be exactly, so the return type isn’t
-known at compile time.
-
-Other duplication includes the similar implementations of the `request_review`
-and `approve` methods on `Post`. Both methods delegate to the implementation of
-the same method on the value in the `state` field of `Option` and set the new
-value of the `state` field to the result. If we had a lot of methods on `Post`
-that followed this pattern, we might consider defining a macro to eliminate the
-repetition (see “Macros” on page XX).
-
-By implementing the state pattern exactly as it’s defined for object-oriented
-languages, we’re not taking as full advantage of Rust’s strengths as we could.
-Let’s look at some changes we can make to the `blog` crate that can make
-invalid states and transitions into compile-time errors.
-
-#### Encoding States and Behavior as Types
-
-We’ll show you how to rethink the state pattern to get a different set of
-trade-offs. Rather than encapsulating the states and transitions completely so
-outside code has no knowledge of them, we’ll encode the states into different
-types. Consequently, Rust’s type checking system will prevent attempts to use
-draft posts where only published posts are allowed by issuing a compiler error.
-
-Let’s consider the first part of `main` in Listing 17-11:
+```
+let messages = get_messages().timeout(Duration::from_millis(200));
+let intervals = get_intervals();
+let merged = messages.merge(intervals);
+```
+
+Listing 17-37: Attempting to merge streams of messages and intervals
+
+At this point, neither `messages` nor `intervals` needs to be pinned or
+mutable, because both will be combined into the single `merged` stream.
+However, this call to `merge` does not compile! (Neither does the `next` call
+in the `while let` loop, but we’ll come back to that after fixing this.) The
+two streams have different types. The `messages` stream has the type
+`Timeout<impl Stream<Item = String>>`, where `Timeout` is the type which
+implements `Stream` for a `timeout` call. Meanwhile, the `intervals` stream has
+the type `impl Stream<Item = u32>`. To merge these two streams, we need to
+transform one of them to match the other.
+
+In Listing 17-38, we rework the `intervals` stream, because `messages` is
+already in the basic format we want and has to handle timeout errors. First, we
+can use the `map` helper method to transform the `intervals` into a string.
+Second, we need to match the `Timeout` from `messages`. Because we don’t
+actually *want* a timeout for `intervals`, though, we can just create a timeout
+which is longer than the other durations we are using. Here, we create a
+10-second timeout with `Duration::from_secs(10)`. Finally, we need to make
+`stream` mutable, so that the `while let` loop’s `next` calls can iterate
+through the stream, and pin it so that it’s safe to do so.
Filename: src/main.rs
```
-fn main() {
- let mut post = Post::new();
+let messages = get_messages().timeout(Duration::from_millis(200));
+let intervals = get_intervals()
+ .map(|count| format!("Interval: {count}"))
+ .timeout(Duration::from_secs(10));
+let merged = messages.merge(intervals);
+let mut stream = pin!(merged);
+```
+
+Listing 17-38: Aligning the types of the the `intervals` stream with the type
+of the `messages` stream
+
+That gets us *almost* to where we need to be. Everything type checks. If you run
+this, though, there will be two problems. First, it will never stop! You’ll
+need to stop it with <span class="keystroke">ctrl-c</span>. Second, the
+messages from the English alphabet will be buried in the midst of all the
+interval counter messages:
+
+```
+--snip--
+Interval: 38
+Interval: 39
+Interval: 40
+Message: 'a'
+Interval: 41
+Interval: 42
+Interval: 43
+--snip--
+```
+
+Listing 17-39 shows one way to solve these last two problems. First, we use the
+`throttle` method on the `intervals` stream, so that it doesn’t overwhelm the
+`messages` stream. Throttling is a way of limiting the rate at which a function
+will be called—or, in this case, how often the stream will be polled. Once every
+hundred milliseconds should do, because that is in the same ballpark as how
+often our messages arrive.
+
+To limit the number of items we will accept from a stream, we can use the `take`
+method. We apply it to the *merged* stream, because we want to limit the final
+output, not just one stream or the other.
+
+Filename: src/main.rs
+
+```
+let messages = get_messages().timeout(Duration::from_millis(200));
+let intervals = get_intervals()
+ .map(|count| format!("Interval: {count}"))
+ .throttle(Duration::from_millis(100))
+ .timeout(Duration::from_secs(10));
+let merged = messages.merge(intervals).take(20);
+let mut stream = pin!(merged);
+```
+
+Listing 17-39: Using `throttle` and `take` to manage the merged streams
+
+Now when we run the program, it stops after pulling twenty items from the
+stream, and the intervals don’t overwhelm the messages. We also don’t get
+`Interval: 100` or `Interval: 200` or so on, but instead get `Interval: 1`,
+`Interval: 2`, and so on—even though we have a source stream which *can*
+produce an event every millisecond. That’s because the `throttle` call
+produces a new stream, wrapping the original stream, so that the original
+stream only gets polled at the throttle rate, not its own “native” rate. We
+don’t have a bunch of unhandled interval messages we’re choosing to
+ignore. Instead, we never produce those interval messages in the first place!
+This is the inherent “laziness” of Rust’s futures at work again, allowing us to
+choose our performance characteristics.
+
+```
+Interval: 1
+Message: 'a'
+Interval: 2
+Interval: 3
+Problem: Elapsed(())
+Interval: 4
+Message: 'b'
+Interval: 5
+Message: 'c'
+Interval: 6
+Interval: 7
+Problem: Elapsed(())
+Interval: 8
+Message: 'd'
+Interval: 9
+Message: 'e'
+Interval: 10
+Interval: 11
+Problem: Elapsed(())
+Interval: 12
+```
+
+There’s one last thing we need to handle: errors! With both of these
+channel-based streams, the `send` calls could fail when the other side of the
+channel closes—and that’s just a matter of how the runtime executes the futures
+which make up the stream. Up until now we have ignored this by calling `unwrap`,
+but in a well-behaved app, we should explicitly handle the error, at minimum by
+ending the loop so we don’t try to send any more messages! Listing 17-40 shows
+a simple error strategy: print the issue and then `break` from the loops. As
+usual, the correct way to handle a message send error will vary—just make sure
+you have a strategy.
+
+```
+fn get_messages() -> impl Stream<Item = String> {
+ let (tx, rx) = trpl::channel();
+
+ trpl::spawn_task(async move {
+ let messages = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"];
+
+ for (index, message) in messages.into_iter().enumerate() {
+ let time_to_sleep = if index % 2 == 0 { 100 } else { 300 };
+ trpl::sleep(Duration::from_millis(time_to_sleep)).await;
+
+ if let Err(send_error) = tx.send(format!("Message: '{message}'")) {
+ eprintln!("Cannot send message '{message}': {send_error}");
+ break;
+ }
+ }
+ });
+
+ ReceiverStream::new(rx)
+}
+
+fn get_intervals() -> impl Stream<Item = u32> {
+ let (tx, rx) = trpl::channel();
+
+ trpl::spawn_task(async move {
+ let mut count = 0;
+ loop {
+ trpl::sleep(Duration::from_millis(1)).await;
+ count += 1;
+
+ if let Err(send_error) = tx.send(count) {
+ eprintln!("Could not send interval {count}: {send_error}");
+ break;
+ };
+ }
+ });
- post.add_text("I ate a salad for lunch today");
- assert_eq!("", post.content());
+ ReceiverStream::new(rx)
}
```
-We still enable the creation of new posts in the draft state using `Post::new`
-and the ability to add text to the post’s content. But instead of having a
-`content` method on a draft post that returns an empty string, we’ll make it so
-draft posts don’t have the `content` method at all. That way, if we try to get
-a draft post’s content, we’ll get a compiler error telling us the method
-doesn’t exist. As a result, it will be impossible for us to accidentally
-display draft post content in production because that code won’t even compile.
-Listing 17-19 shows the definition of a `Post` struct and a `DraftPost` struct,
-as well as methods on each.
+Listing 17-40: Handling errors and shutting down the loops
+
+Now that we’ve seen a bunch of async in practice, let’s take a step back and
+dig into a few of the details of how `Future`, `Stream`, and the other key
+traits which Rust uses to make async work.
+
+## Digging Into the Traits for Async
+
+Throughout the chapter, we’ve used the `Future`, `Pin`, `Unpin`, `Stream`, and
+`StreamExt` traits in various ways. So far, though, we’ve avoided digging too
+far into the details of how they work or how they fit together. Much of the time
+when writing Rust day to day, this is fine. Sometimes, though, you’ll hit
+situations where understanding a few more of these details matters. In this
+section, we’ll dig down *enough* further to help with those situations—while
+still leaving the *really* deep dive for other documentation!
-Filename: src/lib.rs
+### Future
+
+Back in the “Futures and the Async Syntax” section of this chapter on page XX,
+we noted that `Future` is a trait. Let’s start by taking a closer look at how
+it works. Here is how Rust defines a `Future`:
```
-pub struct Post {
- content: String,
+use std::pin::Pin;
+use std::task::{Context, Poll};
+
+pub trait Future {
+ type Output;
+
+ fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>;
}
+```
+
+That trait definition includes a bunch of new types and also some syntax we
+haven’t seen before, so let’s walk through the definition piece by piece.
-pub struct DraftPost {
- content: String,
+First, `Future`’s associated type `Output` says what the future resolves to.
+This is analogous to the `Item` associated type for the `Iterator` trait.
+Second, `Future` also has the `poll` method, which takes a special `Pin`
+reference for its `self` parameter and a mutable reference to a `Context` type,
+and returns a `Poll<Self::Output>`. We’ll talk a little more about `Pin` and
+`Context` later in the section. For now, let’s focus on what the method returns,
+the `Poll` type:
+
+```
+enum Poll<T> {
+ Ready(T),
+ Pending,
}
+```
-impl Post {
- 1 pub fn new() -> DraftPost {
- DraftPost {
- content: String::new(),
- }
- }
+This `Poll` type is similar to an `Option`: it has one variant which has a value
+(`Ready(T)`), and one which does not (`Pending`). It means something quite
+different, though! The `Pending` variant indicates that the future still has
+work to do, so the caller will need to check again later. The `Ready` variant
+indicates that the `Future` has finished its work and the `T` value is
+available.
- 2 pub fn content(&self) -> &str {
- &self.content
+> Note: With most futures, the caller should not call `poll` again after the
+> future has returned `Ready`. Many futures will panic if polled again after
+> becoming ready! Futures which are safe to poll again will say so explicitly in
+> their documentation. This is similar to how `Iterator::next` behaves!
+
+Under the hood, when you see code which uses `await`, Rust compiles that to code
+which calls `poll`. If you look back at Listing 17-4, where we printed out the
+page title for a single URL once it resolved, Rust compiles it into something
+kind of (although not exactly) like this:
+
+```
+match page_title(url).poll() {
+ Ready(page_title) => match page_title {
+ Some(title) => println!("The title for {url} was {title}"),
+ None => println!("{url} had no title"),
+ }
+ Pending => {
+ // But what goes here?
}
}
+```
+
+What should we do when the `Future` is still `Pending`? We need some way to try
+again… and again, and again, until the future is finally ready. In other words,
+a loop:
-impl DraftPost {
- 3 pub fn add_text(&mut self, text: &str) {
- self.content.push_str(text);
+```
+let mut page_title_fut = page_title(url);
+loop {
+ match page_title_fut.poll() {
+ Ready(value) => match page_title {
+ Some(title) => println!("The title for {url} was {title}"),
+ None => println!("{url} had no title"),
+ }
+ Pending => {
+ // continue
+ }
}
}
```
-Listing 17-19: A `Post` with a `content` method and a `DraftPost` without a
-`content` method
+If Rust compiled it to exactly that code, though, every `await` would be
+blocking—exactly the opposite of what we were going for! Instead, Rust needs
+makes sure that the loop can hand off control to something which can pause work
+on this future and work on other futures and check this one again later. That
+“something” is an async runtime, and this scheduling and coordination work is
+one of the main jobs for a runtime.
+
+Recall our description (in the “Counting” section of this chapter on page XX)
+of waiting on `rx.recv`. The `recv` call returns a `Future`, and awaiting it
+polls it. In our initial discussion, we noted that a runtime will pause the
+future until it’s ready with either `Some(message)` or `None` when the channel
+closes. With our deeper understanding of `Future` in place, and specifically
+`Future::poll`, we can see how that works. The runtime knows the future isn’t
+ready when it returns `Poll::Pending`. Conversely, the runtime knows the future
+is ready and advances it when `poll` returns `Poll::Ready(Some(message))` or
+`Poll::Ready(None)`.
+
+The exact details of how a runtime does that are more than we will cover in even
+this deep dive section. The key here is to see the basic mechanic of futures: a
+runtime *polls* each future it is responsible for, putting it back to sleep when
+it is not yet ready.
+
+### Pinning and the Pin and Unpin Traits
+
+When we introduced the idea of pinning, while working on Listing 17-17, we ran
+into a very gnarly error message. Here is the relevant part of it again:
+
+```
+error[E0277]: `{async block@src/main.rs:8:23: 20:10}` cannot be unpinned
+ --> src/main.rs:46:33
+ |
+46 | trpl::join_all(futures).await;
+ | ^^^^^ the trait `Unpin` is not implemented for `{async block@src/main.rs:8:23: 20:10}`, which is required by `Box<{async block@src/main.rs:8:23: 20:10}>: std::future::Future`
+ |
+ = note: consider using the `pin!` macro
+ consider using `Box::pin` if you need to access the pinned value outside of the current scope
+ = note: required for `Box<{async block@src/main.rs:8:23: 20:10}>` to implement `std::future::Future`
+note: required by a bound in `JoinAll`
+ --> ~/.cargo/registry/src/index.crates.io-6f17d22bba15001f/futures-util-0.3.30/src/future/join_all.rs:29:8
+ |
+27 | pub struct JoinAll<F>
+ | ------- required by a bound in this struct
+28 | where
+29 | F: Future,
+ | ^^^^^^ required by this bound in `JoinAll`
+
+Some errors have detailed explanations: E0277, E0308.
+For more information about an error, try `rustc --explain E0277`.
+```
-Both the `Post` and `DraftPost` structs have a private `content` field that
-stores the blog post text. The structs no longer have the `state` field because
-we’re moving the encoding of the state to the types of the structs. The `Post`
-struct will represent a published post, and it has a `content` method that
-returns the `content` [2].
+When we read this error message carefully, it not only tells us that we need to
+pin the values, but also tells us why pinning is required. The `trpl::join_all`
+function returns a struct called `JoinAll`. That struct, in turn, is generic
+over a type `F`, which is constrained to implement the `Future` trait. Finally,
+directly awaiting a Future requires that the future in question implement the
+`Unpin` trait. That’s a lot! But we can understand it, if we dive a little
+further into how the `Future` type actually works, in particular around
+*pinning*.
-We still have a `Post::new` function, but instead of returning an instance of
-`Post`, it returns an instance of `DraftPost` [1]. Because `content` is private
-and there aren’t any functions that return `Post`, it’s not possible to create
-an instance of `Post` right now.
+Let’s look again at the definition of `Future`:
-The `DraftPost` struct has an `add_text` method, so we can add text to
-`content` as before [3], but note that `DraftPost` does not have a `content`
-method defined! So now the program ensures all posts start as draft posts, and
-draft posts don’t have their content available for display. Any attempt to get
-around these constraints will result in a compiler error.
+```
+use std::pin::Pin;
+use std::task::{Context, Poll};
-#### Implementing Transitions as Transformations into Different Types
+pub trait Future {
+ type Output;
-So how do we get a published post? We want to enforce the rule that a draft
-post has to be reviewed and approved before it can be published. A post in the
-pending review state should still not display any content. Let’s implement
-these constraints by adding another struct, `PendingReviewPost`, defining the
-`request_review` method on `DraftPost` to return a `PendingReviewPost` and
-defining an `approve` method on `PendingReviewPost` to return a `Post`, as
-shown in Listing 17-20.
+ // Required method
+ fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>;
+}
+```
-Filename: src/lib.rs
+The `cx` parameter and its `Context` type is the key to how a runtime actually
+knows when to check any given future, while still being lazy. The details of how
+that works are beyond the scope of this chapter, though: you generally only need
+to worry about it when writing a custom `Future` implementation.
+
+Instead, we’ll focus on the type for `self`. This is the first time we’ve seen
+a method where `self` has a type annotation. A type annotation for `self` is
+similar to type annotations for other function parameters, with two key
+differences. First, when we specify the type of `self` in this way, we’re
+telling Rust what type `self` must be to call this method. Second, a type
+annotation on `self` can’t be just any type. It’s only allowed to be the type
+on which the method is implemented, a reference or smart pointer to that type,
+or a `Pin` wrapping a reference to that type. We’ll see more on this syntax in
+Chapter 18. For now, it’s enough to know that if we want to poll a future (to
+check whether it is `Pending` or `Ready(Output)`), we need a mutable reference
+to the type, which is wrapped in a `Pin`.
+
+`Pin` is a wrapper type. In some ways, it’s similar to the `Box`, `Rc`, and
+other smart pointer types we saw in Chapter 15, which also wrap other types.
+Unlike those, however, `Pin` only works with *pointer types* such as references
+(`&` and `&mut`) and smart pointers (`Box`, `Rc`, and so on). To be precise,
+`Pin` works with types which implement the `Deref` or `DerefMut` traits, which
+we covered in the “Treating Smart Pointers Like Regular References with the
+Deref Trait” section of Chapter 15 on page XX. You can think of this restriction
+as equivalent to only working with pointers, though, because implementing
+`Deref` or `DerefMut` means your type behaves similarly to a pointer type. `Pin`
+is also not a pointer itself, and it doesn’t have any behavior of its own the
+way `Rc` and `Arc` do with ref counting. It’s purely a tool the compiler can use
+to uphold the relevant guarantees, by wrapping pointers in the type.
+
+Recalling that `await` is implemented in terms of calls to `poll`, this starts
+to explain the error message we saw above—but that was in terms of `Unpin`, not
+`Pin`. So what exactly are `Pin` and `Unpin`, how do they relate, and why does
+`Future` need `self` to be in a `Pin` type to call `poll`?
+
+In the “”ur First Async Program” section of this chapter on page XX, we
+described how a series of await points in a future get compiled into a state
+machine—and noted how the compiler helps make sure that state machine follows
+all of Rust’s normal rules around safety, including borrowing and ownership. To
+make that work, Rust looks at what data is needed between each await point and
+the next await point or the end of the async block. It then creates a
+corresponding variant in the state machine it creates. Each variant gets the
+access it needs to the data that will be used in that section of the source
+code, whether by taking ownership of that data or by getting a mutable or
+immutable reference to it.
+
+So far so good: if we get anything wrong about the ownership or references in a
+given async block, the borrow checker will tell us. When we want to move around
+the future that corresponds to that block—like moving it into a `Vec` to pass to
+`join_all`, the way we did back in—things get trickier.
+
+When we move a future—whether by pushing into a data structure to use as an
+iterator with `join_all`, or returning them from a function—that actually means
+moving the state machine Rust creates for us. And unlike most other types in
+Rust, the futures Rust creates for async blocks can end up with references to
+themselves in the fields of any given variant, as in Figure 17-4 (a simplified
+illustration to help you get a feel for the idea, rather than digging into what
+are often fairly complicated details).
+
+<img alt="Concurrent work flow" src="img/trpl17-04.svg" />
+
+Figure 17-4: A self-referential data type.
+
+By default, though, any object which has a reference to itself is unsafe to
+move, because references always point to the actual memory address of the thing
+they refer to. If you move the data structure itself, those internal references
+will be left pointing to the old location. However, that memory location is now
+invalid. For one thing, its value will not be updated when you make changes to
+the data structure. For another—and more importantly!—the computer is now free
+to reuse that memory for other things! You could end up reading completely
+unrelated data later.
+
+<img alt="Concurrent work flow" src="img/trpl17-05.svg" />
+
+Figure 17-5: The unsafe result of moving a self-referential data type.
+
+In principle, the Rust compiler could try to update every reference to an object
+every time it gets moved. That would potentially be a lot of performance
+overhead, especially given there can be a whole web of references that need
+updating. On the other hand, if we could make sure the data structure in
+question *doesn’t move in memory*, we don’t have to update any references.
+This is exactly what Rust’s borrow checker requires: you can’t move an item
+which has any active references to it using safe code.
+
+`Pin` builds on that to give us the exact guarantee we need. When we *pin* a
+value by wrapping a pointer to that value in `Pin`, it can no longer move. Thus,
+if you have `Pin<Box<SomeType>>`, you actually pin the `SomeType` value, *not*
+the `Box` pointer. Figure 17-6 illustrates this:
+
+<img alt="Concurrent work flow" src="img/trpl17-06.svg" />
+
+Figure 17-6: Pinning a `Box` which points to a self-referential future type.
+
+In fact, the `Box` pointer can still move around freely. Remember: we care about
+making sure the data ultimately being referenced stays in its place. If a
+pointer moves around, but the data it points to is in the same place, as in
+Figure 17-7, there’s no potential problem. (How you would do this with a `Pin`
+wrapping a `Box` is more than we’ll get into in this particular discussion,
+but it would make for a good exercise! If you look at the docs for the types as
+well as the `std::pin` module, you might be able to work out how you would do
+that.) The key is that the self-referential type itself cannot move, because it
+is still pinned.
+
+<img alt="Concurrent work flow" src="img/trpl17-07.svg" />
+
+Figure 17-7: Moving a `Box` which points to a self-referential future type.
+
+However, most types are perfectly safe to move around, even if they happen to
+be behind a `Pin` pointer. We only need to think about pinning when items have
+internal references. Primitive values such as numbers and booleans don’t have
+any internal references, so they’re obviously safe. Neither do most types you
+normally work with in Rust. A `Vec`, for example, doesn’t have any internal
+references it needs to keep up to date this way, so you can move it around
+without worrying. If you have a `Pin<Vec<String>>`, you’d have to do everything
+via the safe but restrictive APIs provided by `Pin`, even though a
+`Vec<String>` is always safe to move if there are no other references to it. We
+need a way to tell the compiler that it’s actually just fine to move items
+around in cases such as these. For that, we have `Unpin`.
+
+`Unpin` is a marker trait, similar to the `Send` and `Sync` traits we saw in the
+“Extensible Concurrency with the `Sync` and `Send` Traits” section of Chapter
+16 on page XX. Recall that marker traits have no functionality of their own.
+They exist only to tell the compiler that it’s safe to use the type which
+implements a given trait in a particular context. `Unpin` informs the compiler
+that a given type does *not* need to uphold any particular guarantees about
+whether the value in question can be moved.
+
+Just as with `Send` and `Sync`, the compiler implements `Unpin` automatically
+for all types where it can prove it is safe. Implementing `Unpin` manually is
+unsafe because it requires *you* to uphold all the guarantees which make `Pin`
+and `Unpin` safe yourself for a type with internal references. In practice,
+this is a very rare thing to implement yourself!
+
+To make that concrete, think about a `String`: it has a length and the Unicode
+characters which make it up. We can wrap a `String` in `Pin`, as seen in Figure
+17-7. However
+
+<img alt="Concurrent work flow" src="img/trpl17-08.svg" />
+
+Figure 17-8: Pinning a String, with a dotted line indicating that the String
+implements the `Unpin` trait, so it is not pinned.
+
+This means that we can do things such as replace one string with another at the
+exact same location in memory as in Figure 17-9. This doesn’t violate the `Pin`
+contract because `String`—like most other types in Rust—implements `Unpin`,
+because it has no internal references that make it unsafe to move around!
+
+<img alt="Concurrent work flow" src="img/trpl17-09.svg" />
+
+Figure 17-9: Replacing the String with an entirely different String in memory.
+
+Now we know enough to understand the errors reported for that `join_all` call
+from back in Listing 17-17. We originally tried to move the futures produced by
+async blocks into a `Vec<Box<dyn Future<Output = ()>>>`, but as we’ve seen,
+those futures may have internal references, so they don’t implement `Unpin`.
+They need to be pinned, and then we can pass the `Pin` type into the `Vec`,
+confident that the underlying data in the futures will *not* be moved.
+
+`Pin` and `Unpin` are mostly important for building lower-level libraries, or
+when you’re building a runtime itself, rather than for day to day Rust code.
+When you see these traits in error messages, though, now you’ll have a better
+idea of how to fix the code!
+
+> Note: This combination of `Pin` and `Unpin` allows a whole class of complex
+> types to be safe in Rust which are otherwise difficult to implement because
+> they’re self-referential. Types which require `Pin` show up *most* commonly
+> in async Rust today, but you might—very rarely!—see it in other contexts, too.
+>
+> The specifics of how `Pin` and `Unpin` work, and the rules they’re required
+> to uphold, are covered extensively in the API documentation for `std::pin`, so
+> if you’d like to understand them more deeply, that’s a great place to start.
+>
+> If you want to understand how things work “under the hood” in even more
+> detail, the official *Asynchronous Programming in Rust* book available at
+> *https://rust-lang.github.io/async-book/* has you covered:
+>
+> * Chapter 2: Under the Hood: Executing Futures and Tasks
+> * Chapter 4: Pinning
+
+### The Stream Trait
+
+Now that we have a deeper grasp on the `Future`, `Pin`, and `Unpin` traits, we
+can turn our attention to the `Stream` trait. As described in the section
+introducing streams, streams are similar to asynchronous iterators. Unlike
+`Iterator` and `Future`, there is no definition of a `Stream` trait in the
+standard library as of the time of writing, but there *is* a very common
+definition from the `futures` crate used throughout the ecosystem.
+
+Let’s review the definitions of the `Iterator` and `Future` traits, so we can
+build up to how a `Stream` trait that merges them together might look. From
+`Iterator`, we have the idea of a sequence: its `next` method provides an
+`Option<Self::Item>`. From `Future`, we have the idea of readiness over time:
+its `poll` method provides a `Poll<Self::Output>`. To represent a sequence of
+items which become ready over time, we define a `Stream` trait which puts those
+features together:
```
-impl DraftPost {
- --snip--
- pub fn request_review(self) -> PendingReviewPost {
- PendingReviewPost {
- content: self.content,
- }
- }
+use std::pin::Pin;
+use std::task::{Context, Poll};
+
+trait Stream {
+ type Item;
+
+ fn poll_next(
+ self: Pin<&mut Self>,
+ cx: &mut Context<'_>
+ ) -> Poll<Option<Self::Item>>;
}
+```
+
+The `Stream` trait defines an associated type `Item` for the type of the items
+produced by the stream. This is similar to `Iterator`: there may be zero to
+many of these, and unlike `Future`, where there is always a single `Output`
+(even if it’s the unit type `()`).
+
+`Stream` also defines a method to get those items. We call it `poll_next`, to
+make it clear that it polls in the same way `Future::poll` does and produces a
+sequence of items in the same way `Iterator::next` does. Its return type
+combines `Poll` with `Option`. The outer type is `Poll`, because it has to be
+checked for readiness, just as a future does. The inner type is `Option`,
+because it needs to signal whether there are more messages, just as an iterator
+does.
+
+Something very similar to this will likely end up standardized as part of Rust’s
+standard library. In the meantime, it’s part of the toolkit of most runtimes,
+so you can rely on it, and everything we cover below should generally apply!
+
+In the example we saw in the section on streaming, though, we didn’t use
+`poll_next` *or* `Stream`, but instead used `next` and `StreamExt`. We *could*
+work directly in terms of the `poll_next` API by hand-writing our own `Stream`
+state machines, of course, just as we *could* work with futures directly via
+their `poll` method. Using `await` is much nicer, though, so the `StreamExt`
+trait supplies the `next` method so we can do just that.
-pub struct PendingReviewPost {
- content: String,
+```
+trait StreamExt: Stream {
+ async fn next(&mut self) -> Option<Self::Item>
+ where
+ Self: Unpin;
+
+ // other methods...
}
+```
-impl PendingReviewPost {
- pub fn approve(self) -> Post {
- Post {
- content: self.content,
+> Note: The actual definition we used earlier in the chapter looks slightly
+> different than this, because it supports versions of Rust which did not yet
+> support using async functions in traits. As a result, it looks like this:
+>
+> ```
+> fn next(&mut self) -> Next<'_, Self> where Self: Unpin;
+> ```
+>
+> That `Next` type is a `struct` which implements `Future` and gives a way to
+> name the lifetime of the reference to `self` with `Next<'_, Self>`, so that
+> `await` can work with this method!
+
+The `StreamExt` trait is also the home of all the interesting methods available
+to use with streams. `StreamExt` is automatically implemented for every type
+which implements `Stream`, but these traits are defined separately so that the
+community can iterate on the foundational trait distinctly from the convenience
+APIs.
+
+In the version of `StreamExt` used in the `trpl` crate, the trait not only
+defines the `next` method, it also supplies an implementation of `next`, which
+correctly handles the details of calling `Stream::poll_next`. This means that
+even when you need to write your own streaming data type, you *only* have to
+implement `Stream`, and then anyone who uses your data type can use `StreamExt`
+and its methods with it automatically.
+
+That’s all we’re going to cover for the lower-level details on these traits. To
+wrap up, let’s consider how futures (including streams), tasks, and threads all
+fit together!
+
+## Futures, Tasks, and Threads
+
+As we saw in the “Using Threads to Run Code Simultaneously” section of Chapter
+16 on page XX, threads provide one approach to concurrency. We’ve seen another
+approach to concurrency in this chapter, using async with futures and streams.
+You might be wondering why you would choose one or the other. The answer is: it
+depends! And in many cases, the choice isn’t threads *or* async but rather
+threads *and* async.
+
+Many operating systems have supplied threading-based concurrency models for
+decades now, and many programming languages have support for them as a result.
+However, they are not without their tradeoffs. On many operating systems, they
+use a fair bit of memory for each thread, and they come with some overhead for
+starting up and shutting down. Threads are also only an option when your
+operating system and hardware support them! Unlike mainstream desktop and mobile
+computers, some embedded systems don’t have an OS at all, so they also don’t
+have threads!
+
+The async model provides a different—and ultimately complementary—set of
+tradeoffs. In the async model, concurrent operations don’t require their own
+threads. Instead, they can run on tasks, as when we used `trpl::spawn_task` to
+kick off work from a synchronous function throughout the streams section. A task
+is similar to a thread, but instead of being managed by the operating system,
+it’s managed by library-level code: the runtime.
+
+In the previous section, we saw that we could build a `Stream` by using an async
+channel and spawning an async task which we could call from synchronous code. We
+could do the exact same thing with a thread! In Listing 17-40, we used
+`trpl::spawn_task` and `trpl::sleep`. In Listing 17-41, we replace those with
+the `thread::spawn` and `thread::sleep` APIs from the standard library in the
+`get_intervals` function.
+
+Filename: src/main.rs
+
+```
+fn get_intervals() -> impl Stream<Item = u32> {
+ let (tx, rx) = trpl::channel();
+
+ // This is *not* `trpl::spawn` but `std::thread::spawn`!
+ thread::spawn(move || {
+ let mut count = 0;
+ loop {
+ // Likewise, this is *not* `trpl::sleep` but `std::thread::sleep`!
+ thread::sleep(Duration::from_millis(1));
+ count += 1;
+
+ if let Err(send_error) = tx.send(count) {
+ eprintln!("Could not send interval {count}: {send_error}");
+ break;
+ };
}
- }
+ });
+
+ ReceiverStream::new(rx)
}
```
-Listing 17-20: A `PendingReviewPost` that gets created by calling
-`request_review` on `DraftPost` and an `approve` method that turns a
-`PendingReviewPost` into a published `Post`
-
-The `request_review` and `approve` methods take ownership of `self`, thus
-consuming the `DraftPost` and `PendingReviewPost` instances and transforming
-them into a `PendingReviewPost` and a published `Post`, respectively. This way,
-we won’t have any lingering `DraftPost` instances after we’ve called
-`request_review` on them, and so forth. The `PendingReviewPost` struct doesn’t
-have a `content` method defined on it, so attempting to read its content
-results in a compiler error, as with `DraftPost`. Because the only way to get a
-published `Post` instance that does have a `content` method defined is to call
-the `approve` method on a `PendingReviewPost`, and the only way to get a
-`PendingReviewPost` is to call the `request_review` method on a `DraftPost`,
-we’ve now encoded the blog post workflow into the type system.
-
-But we also have to make some small changes to `main`. The `request_review` and
-`approve` methods return new instances rather than modifying the struct they’re
-called on, so we need to add more `let post =` shadowing assignments to save
-the returned instances. We also can’t have the assertions about the draft and
-pending review posts’ contents be empty strings, nor do we need them: we can’t
-compile code that tries to use the content of posts in those states any longer.
-The updated code in `main` is shown in Listing 17-21.
+Listing 17-41: Using the `std::thread` APIs instead of the async `trpl` APIs
+for the `get_intervals` function
+
+If you run this, the output is identical. And notice how little changes here
+from the perspective of the calling code! What’s more, even though one of our
+functions spawned an async task on the runtime and the other spawned an
+OS thread, the resulting streams were unaffected by the differences.
+
+Despite the similarities, these two approaches behave very differently, although
+we might have a hard time measuring it in this very simple example. We could
+spawn millions of async tasks on any modern personal computer. If we tried to do
+that with threads, we would literally run out of memory!
+
+However, there’s a reason these APIs are so similar. Threads act as a boundary
+for sets of synchronous operations; concurrency is possible *between* threads.
+Tasks act as a boundary for sets of *asynchronous* operations; concurrency is
+possible both *between* and *within* tasks, because a task can switch between
+futures in its body. Finally, futures are Rust’s most granular unit of
+concurrency, and each future may represent a tree of other futures. The
+runtime—specifically, its executor—manages tasks, and tasks manage futures. In
+that regard, tasks are similar to lightweight, runtime-managed threads with
+added capabilities that come from being managed by a runtime instead of by the
+operating system.
+
+This doesn’t mean that async tasks are always better than threads, any more than
+that threads are always better than tasks.
+
+Concurrency with threads is in some ways a simpler programming model than
+concurrency with `async`. That can be a strength or a weakness. Threads are
+somewhat “fire and forget,” they have no native equivalent to a future, so they
+simply run to completion, without interruption except by the operating system
+itself. That is, they have no built-in support for *intra-task concurrency* the
+way futures do. Threads in Rust also have no mechanisms for cancellation—a
+subject we haven’t covered in depth in this chapter, but which is implicit in
+the fact that whenever we ended a future, its state got cleaned up correctly.
+
+These limitations also make threads harder to compose than futures. It’s much
+more difficult, for example, to use threads to build helpers such as the
+`timeout` we built in the “Building Our Own Async Abstractions” section of this
+chapter on page XX or the `throttle` method we used with streams in the
+“Composing Streams” section of this chapter on page XX. The fact that futures
+are richer data structures means they can be composed together more naturally,
+as we have seen.
+
+Tasks then give *additional* control over futures, allowing you to choose where
+and how to group the futures. And it turns out that threads and tasks often
+work very well together, because tasks can (at least in some runtimes) be moved
+around between threads. We haven’t mentioned it up until now, but under the
+hood the `Runtime` we have been using, including the `spawn_blocking` and
+`spawn_task` functions, is multithreaded by default! Many runtimes use an
+approach called *work stealing* to transparently move tasks around between
+threads based on the current utilization of the threads, with the aim of
+improving the overall performance of the system. To build that actually requires
+threads *and* tasks, and therefore futures.
+
+As a default way of thinking about which to use when:
+
+* If the task is *very parallelizable*, such as processing a bunch of data where
+ each part can be processed separately, threads are a better choice.
+* If the task is *very concurrent*, such as handling messages from a bunch of
+ different sources which may come in a different intervals or different rates,
+ async is a better choice.
+
+And if you need some mix of parallelism and concurrency, you don’t have to
+choose between threads and async. You can use them together freely, letting each
+one serve the part it is best at. For example, Listing 17-42 shows a fairly
+common example of this kind of mix in real-world Rust code.
Filename: src/main.rs
```
-use blog::Post;
+use std::{thread, time::Duration};
fn main() {
- let mut post = Post::new();
-
- post.add_text("I ate a salad for lunch today");
-
- let post = post.request_review();
+ let (tx, mut rx) = trpl::channel();
- let post = post.approve();
+ thread::spawn(move || {
+ for i in 1..11 {
+ tx.send(i).unwrap();
+ thread::sleep(Duration::from_secs(1));
+ }
+ });
- assert_eq!("I ate a salad for lunch today", post.content());
+ trpl::run(async {
+ while let Some(message) = rx.recv().await {
+ println!("{message}");
+ }
+ });
}
```
-Listing 17-21: Modifications to `main` to use the new implementation of the
-blog post workflow
-
-The changes we needed to make to `main` to reassign `post` mean that this
-implementation doesn’t quite follow the object-oriented state pattern anymore:
-the transformations between the states are no longer encapsulated entirely
-within the `Post` implementation. However, our gain is that invalid states are
-now impossible because of the type system and the type checking that happens at
-compile time! This ensures that certain bugs, such as display of the content of
-an unpublished post, will be discovered before they make it to production.
+Listing 17-42: Sending messages with blocking code in a thread and awaiting the
+messages in an async block
-Try the tasks suggested at the start of this section on the `blog` crate as it
-is after Listing 17-21 to see what you think about the design of this version
-of the code. Note that some of the tasks might be completed already in this
-design.
+We begin by creating an async channel. Then we spawn a thread which takes
+ownership of the sender side of the channel. Within the thread, we send the
+numbers 1 through 10, and sleep for a second in between each. Finally, we run a
+future created with an async block passed to `trpl::run` just as we have
+throughout the chapter. In that future, we await those messages, just as in
+the other message-passing examples we have seen.
-We’ve seen that even though Rust is capable of implementing object-oriented
-design patterns, other patterns, such as encoding state into the type system,
-are also available in Rust. These patterns have different trade-offs. Although
-you might be very familiar with object-oriented patterns, rethinking the
-problem to take advantage of Rust’s features can provide benefits, such as
-preventing some bugs at compile time. Object-oriented patterns won’t always be
-the best solution in Rust due to certain features, like ownership, that
-object-oriented languages don’t have.
+To return to the examples we opened the chapter with: you could imagine running
+a set of video encoding tasks using a dedicated thread, because video encoding
+is compute bound, but notifying the UI that those operations are done with an
+async channel. Examples of this kind of mix abound!
## Summary
-Regardless of whether you think Rust is an object-oriented language after
-reading this chapter, you now know that you can use trait objects to get some
-object-oriented features in Rust. Dynamic dispatch can give your code some
-flexibility in exchange for a bit of runtime performance. You can use this
-flexibility to implement object-oriented patterns that can help your code’s
-maintainability. Rust also has other features, like ownership, that
-object-oriented languages don’t have. An object-oriented pattern won’t always
-be the best way to take advantage of Rust’s strengths, but it is an available
-option.
+This isn’t the last you’ll see of concurrency in this book: the project in
+Chapter 21 will use the concepts in this chapter in a more realistic situation
+than the smaller examples discussed here—and compare more directly what it looks
+like to solve these kinds of problems with threading vs. with tasks and futures.
-Next, we’ll look at patterns, which are another of Rust’s features that enable
-lots of flexibility. We’ve looked at them briefly throughout the book but
-haven’t seen their full capability yet. Let’s go!
+Whether with threads, with futures and tasks, or with the combination of them
+all, Rust gives you the tools you need to write safe, fast, concurrent
+code—whether for a high-throughput web server or an embedded operating system.
+Next, we’ll talk about idiomatic ways to model problems and structure solutions
+as your Rust programs get bigger. In addition, we’ll discuss how Rust’s idioms
+relate to those you might be familiar with from object-oriented programming.
diff --git a/rustbook-en/nostarch/chapter18.md b/rustbook-en/nostarch/chapter18.md
index 40c7f10a1..946d20a11 100644
--- a/rustbook-en/nostarch/chapter18.md
+++ b/rustbook-en/nostarch/chapter18.md
@@ -6,1287 +6,1228 @@ directory, so all fixes need to be made in `/src/`.
[TOC]
-# Patterns and Matching
-
-*Patterns* are a special syntax in Rust for matching against the structure of
-types, both complex and simple. Using patterns in conjunction with `match`
-expressions and other constructs gives you more control over a program’s
-control flow. A pattern consists of some combination of the following:
-
-* Literals
-* Destructured arrays, enums, structs, or tuples
-* Variables
-* Wildcards
-* Placeholders
-
-Some example patterns include `x`, `(a, 3)`, and `Some(Color::Red)`. In the
-contexts in which patterns are valid, these components describe the shape of
-data. Our program then matches values against the patterns to determine whether
-it has the correct shape of data to continue running a particular piece of code.
+# Object-Oriented Programming Features
+
+Object-oriented programming (OOP) is a way of modeling programs. Objects as a
+programmatic concept were introduced in the programming language Simula in the
+1960s. Those objects influenced Alan Kay’s programming architecture in which
+objects pass messages to each other. To describe this architecture, he coined
+the term *object-oriented programming* in 1967. Many competing definitions
+describe what OOP is, and by some of these definitions Rust is object oriented
+but by others it is not. In this chapter, we’ll explore certain characteristics
+that are commonly considered object oriented and how those characteristics
+translate to idiomatic Rust. We’ll then show you how to implement an
+object-oriented design pattern in Rust and discuss the trade-offs of doing so
+versus implementing a solution using some of Rust’s strengths instead.
+
+## Characteristics of Object-Oriented Languages
+
+There is no consensus in the programming community about what features a
+language must have to be considered object oriented. Rust is influenced by many
+programming paradigms, including OOP; for example, we explored the features
+that came from functional programming in Chapter 13. Arguably, OOP languages
+share certain common characteristics, namely objects, encapsulation, and
+inheritance. Let’s look at what each of those characteristics means and whether
+Rust supports it.
+
+### Objects Contain Data and Behavior
+
+The book *Design Patterns: Elements of Reusable Object-Oriented Software* by
+Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides (Addison-Wesley,
+1994), colloquially referred to as *The Gang of Four* book, is a catalog of
+object-oriented design patterns. It defines OOP in this way:
+
+Object-oriented programs are made up of objects. An *object* packages both data
+and the procedures that operate on that data. The procedures are typically
+called *methods* or *operations*.
+
+Using this definition, Rust is object oriented: structs and enums have data,
+and `impl` blocks provide methods on structs and enums. Even though structs and
+enums with methods aren’t *called* objects, they provide the same
+functionality, according to the Gang of Four’s definition of objects.
+
+### Encapsulation That Hides Implementation Details
+
+Another aspect commonly associated with OOP is the idea of *encapsulation*,
+which means that the implementation details of an object aren’t accessible to
+code using that object. Therefore, the only way to interact with an object is
+through its public API; code using the object shouldn’t be able to reach into
+the object’s internals and change data or behavior directly. This enables the
+programmer to change and refactor an object’s internals without needing to
+change the code that uses the object.
+
+We discussed how to control encapsulation in Chapter 7: we can use the `pub`
+keyword to decide which modules, types, functions, and methods in our code
+should be public, and by default everything else is private. For example, we
+can define a struct `AveragedCollection` that has a field containing a vector
+of `i32` values. The struct can also have a field that contains the average of
+the values in the vector, meaning the average doesn’t have to be computed on
+demand whenever anyone needs it. In other words, `AveragedCollection` will
+cache the calculated average for us. Listing 17-1 has the definition of the
+`AveragedCollection` struct.
+
+Filename: src/lib.rs
+
+```
+pub struct AveragedCollection {
+ list: Vec<i32>,
+ average: f64,
+}
+```
-To use a pattern, we compare it to some value. If the pattern matches the
-value, we use the value parts in our code. Recall the `match` expressions in
-Chapter 6 that used patterns, such as the coin-sorting machine example. If the
-value fits the shape of the pattern, we can use the named pieces. If it
-doesn’t, the code associated with the pattern won’t run.
+Listing 17-1: An `AveragedCollection` struct that maintains a list of integers
+and the average of the items in the collection
-This chapter is a reference on all things related to patterns. We’ll cover the
-valid places to use patterns, the difference between refutable and irrefutable
-patterns, and the different kinds of pattern syntax that you might see. By the
-end of the chapter, you’ll know how to use patterns to express many concepts in
-a clear way.
+The struct is marked `pub` so that other code can use it, but the fields within
+the struct remain private. This is important in this case because we want to
+ensure that whenever a value is added or removed from the list, the average is
+also updated. We do this by implementing `add`, `remove`, and `average` methods
+on the struct, as shown in Listing 17-2.
-## All the Places Patterns Can Be Used
+Filename: src/lib.rs
-Patterns pop up in a number of places in Rust, and you’ve been using them a lot
-without realizing it! This section discusses all the places where patterns are
-valid.
+```
+impl AveragedCollection {
+ pub fn add(&mut self, value: i32) {
+ self.list.push(value);
+ self.update_average();
+ }
-### match Arms
+ pub fn remove(&mut self) -> Option<i32> {
+ let result = self.list.pop();
+ match result {
+ Some(value) => {
+ self.update_average();
+ Some(value)
+ }
+ None => None,
+ }
+ }
-As discussed in Chapter 6, we use patterns in the arms of `match` expressions.
-Formally, `match` expressions are defined as the keyword `match`, a value to
-match on, and one or more match arms that consist of a pattern and an
-expression to run if the value matches that arm’s pattern, like this:
+ pub fn average(&self) -> f64 {
+ self.average
+ }
-```
-match VALUE {
- PATTERN => EXPRESSION,
- PATTERN => EXPRESSION,
- PATTERN => EXPRESSION,
+ fn update_average(&mut self) {
+ let total: i32 = self.list.iter().sum();
+ self.average = total as f64 / self.list.len() as f64;
+ }
}
```
-For example, here’s the `match` expression from Listing 6-5 that matches on an
-`Option<i32>` value in the variable `x`:
-
-```
-match x {
- None => None,
- Some(i) => Some(i + 1),
+Listing 17-2: Implementations of the public methods `add`, `remove`, and
+`average` on `AveragedCollection`
+
+The public methods `add`, `remove`, and `average` are the only ways to access
+or modify data in an instance of `AveragedCollection`. When an item is added to
+`list` using the `add` method or removed using the `remove` method, the
+implementations of each call the private `update_average` method that handles
+updating the `average` field as well.
+
+We leave the `list` and `average` fields private so there is no way for
+external code to add or remove items to or from the `list` field directly;
+otherwise, the `average` field might become out of sync when the `list`
+changes. The `average` method returns the value in the `average` field,
+allowing external code to read the `average` but not modify it.
+
+Because we’ve encapsulated the implementation details of the struct
+`AveragedCollection`, we can easily change aspects, such as the data structure,
+in the future. For instance, we could use a `HashSet<i32>` instead of a
+`Vec<i32>` for the `list` field. As long as the signatures of the `add`,
+`remove`, and `average` public methods stayed the same, code using
+`AveragedCollection` wouldn’t need to change. If we made `list` public instead,
+this wouldn’t necessarily be the case: `HashSet<i32>` and `Vec<i32>` have
+different methods for adding and removing items, so the external code would
+likely have to change if it were modifying `list` directly.
+
+If encapsulation is a required aspect for a language to be considered object
+oriented, then Rust meets that requirement. The option to use `pub` or not for
+different parts of code enables encapsulation of implementation details.
+
+### Inheritance as a Type System and as Code Sharing
+
+*Inheritance* is a mechanism whereby an object can inherit elements from
+another object’s definition, thus gaining the parent object’s data and behavior
+without you having to define them again.
+
+If a language must have inheritance to be object oriented, then Rust is not
+such a language. There is no way to define a struct that inherits the parent
+struct’s fields and method implementations without using a macro.
+
+However, if you’re used to having inheritance in your programming toolbox, you
+can use other solutions in Rust, depending on your reason for reaching for
+inheritance in the first place.
+
+You would choose inheritance for two main reasons. One is for reuse of code:
+you can implement particular behavior for one type, and inheritance enables you
+to reuse that implementation for a different type. You can do this in a limited
+way in Rust code using default trait method implementations, which you saw in
+Listing 10-14 when we added a default implementation of the `summarize` method
+on the `Summary` trait. Any type implementing the `Summary` trait would have
+the `summarize` method available on it without any further code. This is
+similar to a parent class having an implementation of a method and an
+inheriting child class also having the implementation of the method. We can
+also override the default implementation of the `summarize` method when we
+implement the `Summary` trait, which is similar to a child class overriding the
+implementation of a method inherited from a parent class.
+
+The other reason to use inheritance relates to the type system: to enable a
+child type to be used in the same places as the parent type. This is also
+called *polymorphism*, which means that you can substitute multiple objects for
+each other at runtime if they share certain characteristics.
+
+> ### Polymorphism
+>
+> To many people, polymorphism is synonymous with inheritance. But it’s
+actually a more general concept that refers to code that can work with data of
+multiple types. For inheritance, those types are generally subclasses.
+>
+> Rust instead uses generics to abstract over different possible types and
+trait bounds to impose constraints on what those types must provide. This is
+sometimes called *bounded parametric polymorphism*.
+
+Inheritance has recently fallen out of favor as a programming design solution
+in many programming languages because it’s often at risk of sharing more code
+than necessary. Subclasses shouldn’t always share all characteristics of their
+parent class but will do so with inheritance. This can make a program’s design
+less flexible. It also introduces the possibility of calling methods on
+subclasses that don’t make sense or that cause errors because the methods don’t
+apply to the subclass. In addition, some languages will only allow single
+inheritance (meaning a subclass can only inherit from one class), further
+restricting the flexibility of a program’s design.
+
+For these reasons, Rust takes the different approach of using trait objects
+instead of inheritance. Let’s look at how trait objects enable polymorphism in
+Rust.
+
+## Using Trait Objects That Allow for Values of Different Types
+
+In Chapter 8, we mentioned that one limitation of vectors is that they can
+store elements of only one type. We created a workaround in Listing 8-9 where
+we defined a `SpreadsheetCell` enum that had variants to hold integers, floats,
+and text. This meant we could store different types of data in each cell and
+still have a vector that represented a row of cells. This is a perfectly good
+solution when our interchangeable items are a fixed set of types that we know
+when our code is compiled.
+
+However, sometimes we want our library user to be able to extend the set of
+types that are valid in a particular situation. To show how we might achieve
+this, we’ll create an example graphical user interface (GUI) tool that iterates
+through a list of items, calling a `draw` method on each one to draw it to the
+screen—a common technique for GUI tools. We’ll create a library crate called
+`gui` that contains the structure of a GUI library. This crate might include
+some types for people to use, such as `Button` or `TextField`. In addition,
+`gui` users will want to create their own types that can be drawn: for
+instance, one programmer might add an `Image` and another might add a
+`SelectBox`.
+
+We won’t implement a full-fledged GUI library for this example but will show
+how the pieces would fit together. At the time of writing the library, we can’t
+know and define all the types other programmers might want to create. But we do
+know that `gui` needs to keep track of many values of different types, and it
+needs to call a `draw` method on each of these differently typed values. It
+doesn’t need to know exactly what will happen when we call the `draw` method,
+just that the value will have that method available for us to call.
+
+To do this in a language with inheritance, we might define a class named
+`Component` that has a method named `draw` on it. The other classes, such as
+`Button`, `Image`, and `SelectBox`, would inherit from `Component` and thus
+inherit the `draw` method. They could each override the `draw` method to define
+their custom behavior, but the framework could treat all of the types as if
+they were `Component` instances and call `draw` on them. But because Rust
+doesn’t have inheritance, we need another way to structure the `gui` library to
+allow users to extend it with new types.
+
+### Defining a Trait for Common Behavior
+
+To implement the behavior we want `gui` to have, we’ll define a trait named
+`Draw` that will have one method named `draw`. Then we can define a vector that
+takes a *trait object*. A trait object points to both an instance of a type
+implementing our specified trait and a table used to look up trait methods on
+that type at runtime. We create a trait object by specifying some sort of
+pointer, such as a `&` reference or a `Box<T>` smart pointer, then the `dyn`
+keyword, and then specifying the relevant trait. (We’ll talk about the reason
+trait objects must use a pointer in “Dynamically Sized Types and the Sized
+Trait” on page XX.) We can use trait objects in place of a generic or concrete
+type. Wherever we use a trait object, Rust’s type system will ensure at compile
+time that any value used in that context will implement the trait object’s
+trait. Consequently, we don’t need to know all the possible types at compile
+time.
+
+We’ve mentioned that, in Rust, we refrain from calling structs and enums
+“objects” to distinguish them from other languages’ objects. In a struct or
+enum, the data in the struct fields and the behavior in `impl` blocks are
+separated, whereas in other languages, the data and behavior combined into one
+concept is often labeled an object. However, trait objects *are* more like
+objects in other languages in the sense that they combine data and behavior.
+But trait objects differ from traditional objects in that we can’t add data to
+a trait object. Trait objects aren’t as generally useful as objects in other
+languages: their specific purpose is to allow abstraction across common
+behavior.
+
+Listing 17-3 shows how to define a trait named `Draw` with one method named
+`draw`.
+
+Filename: src/lib.rs
+
+```
+pub trait Draw {
+ fn draw(&self);
}
```
-The patterns in this `match` expression are the `None` and `Some(i)` to the
-left of each arrow.
-
-One requirement for `match` expressions is that they need to be *exhaustive* in
-the sense that all possibilities for the value in the `match` expression must
-be accounted for. One way to ensure you’ve covered every possibility is to have
-a catchall pattern for the last arm: for example, a variable name matching any
-value can never fail and thus covers every remaining case.
-
-The particular pattern `_` will match anything, but it never binds to a
-variable, so it’s often used in the last match arm. The `_` pattern can be
-useful when you want to ignore any value not specified, for example. We’ll
-cover the `_` pattern in more detail in “Ignoring Values in a Pattern” on page
-XX.
-
-### Conditional if let Expressions
-
-In Chapter 6, we discussed how to use `if let` expressions mainly as a shorter
-way to write the equivalent of a `match` that only matches one case.
-Optionally, `if let` can have a corresponding `else` containing code to run if
-the pattern in the `if let` doesn’t match.
+Listing 17-3: Definition of the `Draw` trait
-Listing 18-1 shows that it’s also possible to mix and match `if let`, `else
-if`, and `else if let` expressions. Doing so gives us more flexibility than a
-`match` expression in which we can express only one value to compare with the
-patterns. Also, Rust doesn’t require that the conditions in a series of `if
-let`, `else if`, and `else if let` arms relate to each other.
+This syntax should look familiar from our discussions on how to define traits
+in Chapter 10. Next comes some new syntax: Listing 17-4 defines a struct named
+`Screen` that holds a vector named `components`. This vector is of type
+`Box<dyn Draw>`, which is a trait object; it’s a stand-in for any type inside a
+`Box` that implements the `Draw` trait.
-The code in Listing 18-1 determines what color to make your background based on
-a series of checks for several conditions. For this example, we’ve created
-variables with hardcoded values that a real program might receive from user
-input.
-
-Filename: src/main.rs
+Filename: src/lib.rs
```
-fn main() {
- let favorite_color: Option<&str> = None;
- let is_tuesday = false;
- let age: Result<u8, _> = "34".parse();
-
- 1 if let Some(color) = favorite_color {
- 2 println!(
- "Using your favorite, {color}, as the background"
- );
- 3 } else if is_tuesday {
- 4 println!("Tuesday is green day!");
- 5 } else if let Ok(age) = age {
- 6 if age > 30 {
- 7 println!("Using purple as the background color");
- } else {
- 8 println!("Using orange as the background color");
- }
- 9 } else {
- 10 println!("Using blue as the background color");
- }
+pub struct Screen {
+ pub components: Vec<Box<dyn Draw>>,
}
```
-Listing 18-1: Mixing `if let`, `else if`, `else if let`, and `else`
-
-If the user specifies a favorite color [1], that color is used as the
-background [2]. If no favorite color is specified and today is Tuesday [3], the
-background color is green [4]. Otherwise, if the user specifies their age as a
-string and we can parse it as a number successfully [5], the color is either
-purple [7] or orange [8] depending on the value of the number [6]. If none of
-these conditions apply [9], the background color is blue [10].
-
-This conditional structure lets us support complex requirements. With the
-hardcoded values we have here, this example will print `Using purple as the
-background color`.
-
-You can see that `if let` can also introduce shadowed variables in the same way
-that `match` arms can: the line `if let Ok(age) = age` [5] introduces a new
-shadowed `age` variable that contains the value inside the `Ok` variant. This
-means we need to place the `if age > 30` condition [6] within that block: we
-can’t combine these two conditions into `if let Ok(age) = age && age > 30`. The
-shadowed `age` we want to compare to 30 isn’t valid until the new scope starts
-with the curly bracket.
-
-The downside of using `if let` expressions is that the compiler doesn’t check
-for exhaustiveness, whereas with `match` expressions it does. If we omitted the
-last `else` block [9] and therefore missed handling some cases, the compiler
-would not alert us to the possible logic bug.
+Listing 17-4: Definition of the `Screen` struct with a `components` field
+holding a vector of trait objects that implement the `Draw` trait
-### while let Conditional Loops
+On the `Screen` struct, we’ll define a method named `run` that will call the
+`draw` method on each of its `components`, as shown in Listing 17-5.
-Similar in construction to `if let`, the `while let` conditional loop allows a
-`while` loop to run for as long as a pattern continues to match. In Listing
-18-2, we code a `while let` loop that uses a vector as a stack and prints the
-values in the vector in the opposite order in which they were pushed.
-
-Filename: src/main.rs
+Filename: src/lib.rs
```
-let mut stack = Vec::new();
-
-stack.push(1);
-stack.push(2);
-stack.push(3);
-
-while let Some(top) = stack.pop() {
- println!("{top}");
+impl Screen {
+ pub fn run(&self) {
+ for component in self.components.iter() {
+ component.draw();
+ }
+ }
}
```
-Listing 18-2: Using a `while let` loop to print values for as long as
-`stack.pop()` returns `Some`
+Listing 17-5: A `run` method on `Screen` that calls the `draw` method on each
+component
-This example prints `3`, `2`, and then `1`. The `pop` method takes the last
-element out of the vector and returns `Some(value)`. If the vector is empty,
-`pop` returns `None`. The `while` loop continues running the code in its block
-as long as `pop` returns `Some`. When `pop` returns `None`, the loop stops. We
-can use `while let` to pop every element off our stack.
+This works differently from defining a struct that uses a generic type
+parameter with trait bounds. A generic type parameter can only be substituted
+with one concrete type at a time, whereas trait objects allow for multiple
+concrete types to fill in for the trait object at runtime. For example, we
+could have defined the `Screen` struct using a generic type and a trait bound,
+as in Listing 17-6.
-### for Loops
-
-In a `for` loop, the value that directly follows the keyword `for` is a
-pattern. For example, in `for x in y`, the `x` is the pattern. Listing 18-3
-demonstrates how to use a pattern in a `for` loop to *destructure*, or break
-apart, a tuple as part of the `for` loop.
-
-Filename: src/main.rs
+Filename: src/lib.rs
```
-let v = vec!['a', 'b', 'c'];
+pub struct Screen<T: Draw> {
+ pub components: Vec<T>,
+}
-for (index, value) in v.iter().enumerate() {
- println!("{value} is at index {index}");
+impl<T> Screen<T>
+where
+ T: Draw,
+{
+ pub fn run(&self) {
+ for component in self.components.iter() {
+ component.draw();
+ }
+ }
}
```
-Listing 18-3: Using a pattern in a `for` loop to destructure a tuple
+Listing 17-6: An alternate implementation of the `Screen` struct and its `run`
+method using generics and trait bounds
-The code in Listing 18-3 will print the following:
+This restricts us to a `Screen` instance that has a list of components all of
+type `Button` or all of type `TextField`. If you’ll only ever have homogeneous
+collections, using generics and trait bounds is preferable because the
+definitions will be monomorphized at compile time to use the concrete types.
-```
-a is at index 0
-b is at index 1
-c is at index 2
-```
+On the other hand, with the method using trait objects, one `Screen` instance
+can hold a `Vec<T>` that contains a `Box<Button>` as well as a
+`Box<TextField>`. Let’s look at how this works, and then we’ll talk about the
+runtime performance implications.
-We adapt an iterator using the `enumerate` method so it produces a value and
-the index for that value, placed into a tuple. The first value produced is the
-tuple `(0, 'a')`. When this value is matched to the pattern `(index, value)`,
-`index` will be `0` and `value` will be `'a'`, printing the first line of the
-output.
+### Implementing the Trait
-### let Statements
+Now we’ll add some types that implement the `Draw` trait. We’ll provide the
+`Button` type. Again, actually implementing a GUI library is beyond the scope
+of this book, so the `draw` method won’t have any useful implementation in its
+body. To imagine what the implementation might look like, a `Button` struct
+might have fields for `width`, `height`, and `label`, as shown in Listing 17-7.
-Prior to this chapter, we had only explicitly discussed using patterns with
-`match` and `if let`, but in fact, we’ve used patterns in other places as well,
-including in `let` statements. For example, consider this straightforward
-variable assignment with `let`:
+Filename: src/lib.rs
```
-let x = 5;
-```
-
-Every time you’ve used a `let` statement like this you’ve been using patterns,
-although you might not have realized it! More formally, a `let` statement looks
-like this:
-
-```
-let PATTERN = EXPRESSION;
-```
-
-In statements like `let x = 5;` with a variable name in the PATTERN slot, the
-variable name is just a particularly simple form of a pattern. Rust compares
-the expression against the pattern and assigns any names it finds. So, in the
-`let x = 5;` example, `x` is a pattern that means “bind what matches here to
-the variable `x`.” Because the name `x` is the whole pattern, this pattern
-effectively means “bind everything to the variable `x`, whatever the value is.”
-
-To see the pattern-matching aspect of `let` more clearly, consider Listing
-18-4, which uses a pattern with `let` to destructure a tuple.
+pub struct Button {
+ pub width: u32,
+ pub height: u32,
+ pub label: String,
+}
-```
-let (x, y, z) = (1, 2, 3);
+impl Draw for Button {
+ fn draw(&self) {
+ // code to actually draw a button
+ }
+}
```
-Listing 18-4: Using a pattern to destructure a tuple and create three variables
-at once
+Listing 17-7: A `Button` struct that implements the `Draw` trait
-Here, we match a tuple against a pattern. Rust compares the value `(1, 2, 3)`
-to the pattern `(x, y, z)` and sees that the value matches the pattern, in that
-it sees that the number of elements is the same in both, so Rust binds `1` to
-`x`, `2` to `y`, and `3` to `z`. You can think of this tuple pattern as nesting
-three individual variable patterns inside it.
+The `width`, `height`, and `label` fields on `Button` will differ from the
+fields on other components; for example, a `TextField` type might have those
+same fields plus a `placeholder` field. Each of the types we want to draw on
+the screen will implement the `Draw` trait but will use different code in the
+`draw` method to define how to draw that particular type, as `Button` has here
+(without the actual GUI code, as mentioned). The `Button` type, for instance,
+might have an additional `impl` block containing methods related to what
+happens when a user clicks the button. These kinds of methods won’t apply to
+types like `TextField`.
-If the number of elements in the pattern doesn’t match the number of elements
-in the tuple, the overall type won’t match and we’ll get a compiler error. For
-example, Listing 18-5 shows an attempt to destructure a tuple with three
-elements into two variables, which won’t work.
+If someone using our library decides to implement a `SelectBox` struct that has
+`width`, `height`, and `options` fields, they would implement the `Draw` trait
+on the `SelectBox` type as well, as shown in Listing 17-8.
-```
-let (x, y) = (1, 2, 3);
-```
-
-Listing 18-5: Incorrectly constructing a pattern whose variables don’t match
-the number of elements in the tuple
-
-Attempting to compile this code results in this type error:
+Filename: src/main.rs
```
-error[E0308]: mismatched types
- --> src/main.rs:2:9
- |
-2 | let (x, y) = (1, 2, 3);
- | ^^^^^^ --------- this expression has type `({integer}, {integer},
-{integer})`
- | |
- | expected a tuple with 3 elements, found one with 2 elements
- |
- = note: expected tuple `({integer}, {integer}, {integer})`
- found tuple `(_, _)`
-```
-
-To fix the error, we could ignore one or more of the values in the tuple using
-`_` or `..`, as you’ll see in “Ignoring Values in a Pattern” on page XX. If the
-problem is that we have too many variables in the pattern, the solution is to
-make the types match by removing variables so the number of variables equals
-the number of elements in the tuple.
+use gui::Draw;
-### Function Parameters
-
-Function parameters can also be patterns. The code in Listing 18-6, which
-declares a function named `foo` that takes one parameter named `x` of type
-`i32`, should by now look familiar.
+struct SelectBox {
+ width: u32,
+ height: u32,
+ options: Vec<String>,
+}
-```
-fn foo(x: i32) {
- // code goes here
+impl Draw for SelectBox {
+ fn draw(&self) {
+ // code to actually draw a select box
+ }
}
```
-Listing 18-6: A function signature using patterns in the parameters
+Listing 17-8: Another crate using `gui` and implementing the `Draw` trait on a
+`SelectBox` struct
-The `x` part is a pattern! As we did with `let`, we could match a tuple in a
-function’s arguments to the pattern. Listing 18-7 splits the values in a tuple
-as we pass it to a function.
+Our library’s user can now write their `main` function to create a `Screen`
+instance. To the `Screen` instance, they can add a `SelectBox` and a `Button`
+by putting each in a `Box<T>` to become a trait object. They can then call the
+`run` method on the `Screen` instance, which will call `draw` on each of the
+components. Listing 17-9 shows this implementation.
Filename: src/main.rs
```
-fn print_coordinates(&(x, y): &(i32, i32)) {
- println!("Current location: ({x}, {y})");
-}
+use gui::{Button, Screen};
fn main() {
- let point = (3, 5);
- print_coordinates(&point);
+ let screen = Screen {
+ components: vec![
+ Box::new(SelectBox {
+ width: 75,
+ height: 10,
+ options: vec![
+ String::from("Yes"),
+ String::from("Maybe"),
+ String::from("No"),
+ ],
+ }),
+ Box::new(Button {
+ width: 50,
+ height: 10,
+ label: String::from("OK"),
+ }),
+ ],
+ };
+
+ screen.run();
}
```
-Listing 18-7: A function with parameters that destructure a tuple
-
-This code prints `Current location: (3, 5)`. The values `&(3, 5)` match the
-pattern `&(x, y)`, so `x` is the value `3` and `y` is the value `5`.
-
-We can also use patterns in closure parameter lists in the same way as in
-function parameter lists because closures are similar to functions, as
-discussed in Chapter 13.
-
-At this point, you’ve seen several ways to use patterns, but patterns don’t
-work the same in every place we can use them. In some places, the patterns must
-be irrefutable; in other circumstances, they can be refutable. We’ll discuss
-these two concepts next.
-
-## Refutability: Whether a Pattern Might Fail to Match
-
-Patterns come in two forms: refutable and irrefutable. Patterns that will match
-for any possible value passed are *irrefutable*. An example would be `x` in the
-statement `let x = 5;` because `x` matches anything and therefore cannot fail
-to match. Patterns that can fail to match for some possible value are
-*refutable*. An example would be `Some(x)` in the expression `if let Some(x) =
-a_value` because if the value in the `a_value` variable is `None` rather than
-`Some`, the `Some(x)` pattern will not match.
-
-Function parameters, `let` statements, and `for` loops can only accept
-irrefutable patterns because the program cannot do anything meaningful when
-values don’t match. The `if let` and `while let` expressions accept refutable
-and irrefutable patterns, but the compiler warns against irrefutable patterns
-because, by definition, they’re intended to handle possible failure: the
-functionality of a conditional is in its ability to perform differently
-depending on success or failure.
-
-In general, you shouldn’t have to worry about the distinction between refutable
-and irrefutable patterns; however, you do need to be familiar with the concept
-of refutability so you can respond when you see it in an error message. In
-those cases, you’ll need to change either the pattern or the construct you’re
-using the pattern with, depending on the intended behavior of the code.
-
-Let’s look at an example of what happens when we try to use a refutable pattern
-where Rust requires an irrefutable pattern and vice versa. Listing 18-8 shows a
-`let` statement, but for the pattern, we’ve specified `Some(x)`, a refutable
-pattern. As you might expect, this code will not compile.
+Listing 17-9: Using trait objects to store values of different types that
+implement the same trait
-```
-let Some(x) = some_option_value;
-```
+When we wrote the library, we didn’t know that someone might add the
+`SelectBox` type, but our `Screen` implementation was able to operate on the
+new type and draw it because `SelectBox` implements the `Draw` trait, which
+means it implements the `draw` method.
-Listing 18-8: Attempting to use a refutable pattern with `let`
+This concept—of being concerned only with the messages a value responds to
+rather than the value’s concrete type—is similar to the concept of *duck
+typing* in dynamically typed languages: if it walks like a duck and quacks like
+a duck, then it must be a duck! In the implementation of `run` on `Screen` in
+Listing 17-5, `run` doesn’t need to know what the concrete type of each
+component is. It doesn’t check whether a component is an instance of a `Button`
+or a `SelectBox`, it just calls the `draw` method on the component. By
+specifying `Box<dyn Draw>` as the type of the values in the `components`
+vector, we’ve defined `Screen` to need values that we can call the `draw`
+method on.
-If `some_option_value` were a `None` value, it would fail to match the pattern
-`Some(x)`, meaning the pattern is refutable. However, the `let` statement can
-only accept an irrefutable pattern because there is nothing valid the code can
-do with a `None` value. At compile time, Rust will complain that we’ve tried to
-use a refutable pattern where an irrefutable pattern is required:
+The advantage of using trait objects and Rust’s type system to write code
+similar to code using duck typing is that we never have to check whether a
+value implements a particular method at runtime or worry about getting errors
+if a value doesn’t implement a method but we call it anyway. Rust won’t compile
+our code if the values don’t implement the traits that the trait objects need.
-```
-error[E0005]: refutable pattern in local binding: `None` not covered
- --> src/main.rs:3:9
- |
-3 | let Some(x) = some_option_value;
- | ^^^^^^^ pattern `None` not covered
- |
- = note: `let` bindings require an "irrefutable pattern", like a `struct` or
-an `enum` with only one variant
- = note: for more information, visit
-https://doc.rust-lang.org/book/ch18-02-refutability.html
- = note: the matched value is of type `Option<i32>`
-help: you might want to use `if let` to ignore the variant that isn't matched
- |
-3 | let x = if let Some(x) = some_option_value { x } else { todo!() };
- | ++++++++++ ++++++++++++++++++++++
-```
-
-Because we didn’t cover (and couldn’t cover!) every valid value with the
-pattern `Some(x)`, Rust rightfully produces a compiler error.
+For example, Listing 17-10 shows what happens if we try to create a `Screen`
+with a `String` as a component.
-If we have a refutable pattern where an irrefutable pattern is needed, we can
-fix it by changing the code that uses the pattern: instead of using `let`, we
-can use `if let`. Then, if the pattern doesn’t match, the code will just skip
-the code in the curly brackets, giving it a way to continue validly. Listing
-18-9 shows how to fix the code in Listing 18-8.
+Filename: src/main.rs
```
-if let Some(x) = some_option_value {
- println!("{x}");
-}
-```
+use gui::Screen;
-Listing 18-9: Using `if let` and a block with refutable patterns instead of
-`let`
-
-We’ve given the code an out! This code is perfectly valid, although it means we
-cannot use an irrefutable pattern without receiving an error. If we give `if
-let` a pattern that will always match, such as `x`, as shown in Listing 18-10,
-the compiler will give a warning.
+fn main() {
+ let screen = Screen {
+ components: vec![Box::new(String::from("Hi"))],
+ };
-```
-if let x = 5 {
- println!("{x}");
-};
+ screen.run();
+}
```
-Listing 18-10: Attempting to use an irrefutable pattern with `if let`
+Listing 17-10: Attempting to use a type that doesn’t implement the trait
+object’s trait
-Rust complains that it doesn’t make sense to use `if let` with an irrefutable
-pattern:
+We’ll get this error because `String` doesn’t implement the `Draw` trait:
```
-warning: irrefutable `if let` pattern
- --> src/main.rs:2:8
+error[E0277]: the trait bound `String: Draw` is not satisfied
+ --> src/main.rs:5:26
|
-2 | if let x = 5 {
- | ^^^^^^^^^
+5 | components: vec![Box::new(String::from("Hi"))],
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Draw` is
+not implemented for `String`
|
- = note: `#[warn(irrefutable_let_patterns)]` on by default
- = note: this pattern will always match, so the `if let` is
-useless
- = help: consider replacing the `if let` with a `let`
-```
-
-For this reason, match arms must use refutable patterns, except for the last
-arm, which should match any remaining values with an irrefutable pattern. Rust
-allows us to use an irrefutable pattern in a `match` with only one arm, but
-this syntax isn’t particularly useful and could be replaced with a simpler
-`let` statement.
-
-Now that you know where to use patterns and the difference between refutable
-and irrefutable patterns, let’s cover all the syntax we can use to create
-patterns.
-
-## Pattern Syntax
-
-In this section, we gather all the syntax that is valid in patterns and discuss
-why and when you might want to use each one.
-
-### Matching Literals
-
-As you saw in Chapter 6, you can match patterns against literals directly. The
-following code gives some examples:
+ = note: required for the cast to the object type `dyn Draw`
+```
+
+This error lets us know that either we’re passing something to `Screen` that we
+didn’t mean to pass and so should pass a different type, or we should implement
+`Draw` on `String` so that `Screen` is able to call `draw` on it.
+
+### Trait Objects Perform Dynamic Dispatch
+
+Recall in “Performance of Code Using Generics” on page XX our discussion on the
+monomorphization process performed by the compiler when we use trait bounds on
+generics: the compiler generates nongeneric implementations of functions and
+methods for each concrete type that we use in place of a generic type
+parameter. The code that results from monomorphization is doing *static
+dispatch*, which is when the compiler knows what method you’re calling at
+compile time. This is opposed to *dynamic dispatch*, which is when the compiler
+can’t tell at compile time which method you’re calling. In dynamic dispatch
+cases, the compiler emits code that at runtime will figure out which method to
+call.
+
+When we use trait objects, Rust must use dynamic dispatch. The compiler doesn’t
+know all the types that might be used with the code that’s using trait objects,
+so it doesn’t know which method implemented on which type to call. Instead, at
+runtime, Rust uses the pointers inside the trait object to know which method to
+call. This lookup incurs a runtime cost that doesn’t occur with static
+dispatch. Dynamic dispatch also prevents the compiler from choosing to inline a
+method’s code, which in turn prevents some optimizations. However, we did get
+extra flexibility in the code that we wrote in Listing 17-5 and were able to
+support in Listing 17-9, so it’s a trade-off to consider.
+
+## Implementing an Object-Oriented Design Pattern
+
+The *state pattern* is an object-oriented design pattern. The crux of the
+pattern is that we define a set of states a value can have internally. The
+states are represented by a set of *state objects*, and the value’s behavior
+changes based on its state. We’re going to work through an example of a blog
+post struct that has a field to hold its state, which will be a state object
+from the set “draft,” “review,” or “published.”
+
+The state objects share functionality: in Rust, of course, we use structs and
+traits rather than objects and inheritance. Each state object is responsible
+for its own behavior and for governing when it should change into another
+state. The value that holds a state object knows nothing about the different
+behavior of the states or when to transition between states.
+
+The advantage of using the state pattern is that, when the business
+requirements of the program change, we won’t need to change the code of the
+value holding the state or the code that uses the value. We’ll only need to
+update the code inside one of the state objects to change its rules or perhaps
+add more state objects.
+
+First we’re going to implement the state pattern in a more traditional
+object-oriented way, then we’ll use an approach that’s a bit more natural in
+Rust. Let’s dig in to incrementally implement a blog post workflow using the
+state pattern.
+
+The final functionality will look like this:
+
+1. A blog post starts as an empty draft.
+1. When the draft is done, a review of the post is requested.
+1. When the post is approved, it gets published.
+1. Only published blog posts return content to print, so unapproved posts can’t
+accidentally be published.
+
+Any other changes attempted on a post should have no effect. For example, if we
+try to approve a draft blog post before we’ve requested a review, the post
+should remain an unpublished draft.
+
+Listing 17-11 shows this workflow in code form: this is an example usage of the
+API we’ll implement in a library crate named `blog`. This won’t compile yet
+because we haven’t implemented the `blog` crate.
Filename: src/main.rs
```
-let x = 1;
-
-match x {
- 1 => println!("one"),
- 2 => println!("two"),
- 3 => println!("three"),
- _ => println!("anything"),
-}
-```
-
-This code prints `one` because the value in `x` is `1`. This syntax is useful
-when you want your code to take an action if it gets a particular concrete
-value.
-
-### Matching Named Variables
-
-Named variables are irrefutable patterns that match any value, and we’ve used
-them many times in this book. However, there is a complication when you use
-named variables in `match` expressions. Because `match` starts a new scope,
-variables declared as part of a pattern inside the `match` expression will
-shadow those with the same name outside the `match` construct, as is the case
-with all variables. In Listing 18-11, we declare a variable named `x` with the
-value `Some(5)` and a variable `y` with the value `10`. We then create a
-`match` expression on the value `x`. Look at the patterns in the match arms and
-`println!` at the end, and try to figure out what the code will print before
-running this code or reading further.
+use blog::Post;
-Filename: src/main.rs
-
-```
fn main() {
- 1 let x = Some(5);
- 2 let y = 10;
-
- match x {
- 3 Some(50) => println!("Got 50"),
- 4 Some(y) => println!("Matched, y = {y}"),
- 5 _ => println!("Default case, x = {:?}", x),
- }
-
- 6 println!("at the end: x = {:?}, y = {y}", x);
-}
-```
-
-Listing 18-11: A `match` expression with an arm that introduces a shadowed
-variable `y`
-
-Let’s walk through what happens when the `match` expression runs. The pattern
-in the first match arm [3] doesn’t match the defined value of `x` [1], so the
-code continues.
-
-The pattern in the second match arm [4] introduces a new variable named `y`
-that will match any value inside a `Some` value. Because we’re in a new scope
-inside the `match` expression, this is a new `y` variable, not the `y` we
-declared at the beginning with the value `10` [2]. This new `y` binding will
-match any value inside a `Some`, which is what we have in `x`. Therefore, this
-new `y` binds to the inner value of the `Some` in `x`. That value is `5`, so
-the expression for that arm executes and prints `Matched, y = 5`.
-
-If `x` had been a `None` value instead of `Some(5)`, the patterns in the first
-two arms wouldn’t have matched, so the value would have matched to the
-underscore [5]. We didn’t introduce the `x` variable in the pattern of the
-underscore arm, so the `x` in the expression is still the outer `x` that hasn’t
-been shadowed. In this hypothetical case, the `match` would print `Default
-case, x = None`.
-
-When the `match` expression is done, its scope ends, and so does the scope of
-the inner `y`. The last `println!` [6] produces `at the end: x = Some(5), y =
-10`.
-
-To create a `match` expression that compares the values of the outer `x` and
-`y`, rather than introducing a shadowed variable, we would need to use a match
-guard conditional instead. We’ll talk about match guards in “Extra Conditionals
-with Match Guards” on page XX.
-
-### Multiple Patterns
-
-In `match` expressions, you can match multiple patterns using the `|` syntax,
-which is the pattern *or* operator. For example, in the following code we match
-the value of `x` against the match arms, the first of which has an *or* option,
-meaning if the value of `x` matches either of the values in that arm, that
-arm’s code will run:
-
-Filename: src/main.rs
-
-```
-let x = 1;
-
-match x {
- 1 | 2 => println!("one or two"),
- 3 => println!("three"),
- _ => println!("anything"),
-}
-```
-
-This code prints `one or two`.
+ 1 let mut post = Post::new();
-### Matching Ranges of Values with ..=
+ 2 post.add_text("I ate a salad for lunch today");
+ 3 assert_eq!("", post.content());
-The `..=` syntax allows us to match to an inclusive range of values. In the
-following code, when a pattern matches any of the values within the given
-range, that arm will execute:
-
-Filename: src/main.rs
-
-```
-let x = 5;
+ 4 post.request_review();
+ 5 assert_eq!("", post.content());
-match x {
- 1..=5 => println!("one through five"),
- _ => println!("something else"),
+ 6 post.approve();
+ 7 assert_eq!("I ate a salad for lunch today", post.content());
}
```
-If `x` is `1`, `2`, `3`, `4`, or `5`, the first arm will match. This syntax is
-more convenient for multiple match values than using the `|` operator to
-express the same idea; if we were to use `|`, we would have to specify `1 | 2 |
-3 | 4 | 5`. Specifying a range is much shorter, especially if we want to match,
-say, any number between 1 and 1,000!
+Listing 17-11: Code that demonstrates the desired behavior we want our `blog`
+crate to have
-The compiler checks that the range isn’t empty at compile time, and because the
-only types for which Rust can tell if a range is empty or not are `char` and
-numeric values, ranges are only allowed with numeric or `char` values.
-
-Here is an example using ranges of `char` values:
-
-Filename: src/main.rs
-
-```
-let x = 'c';
-
-match x {
- 'a'..='j' => println!("early ASCII letter"),
- 'k'..='z' => println!("late ASCII letter"),
- _ => println!("something else"),
-}
-```
+We want to allow the user to create a new draft blog post with `Post::new` [1].
+We want to allow text to be added to the blog post [2]. If we try to get the
+post’s content immediately, before approval, we shouldn’t get any text because
+the post is still a draft. We’ve added `assert_eq!` in the code for
+demonstration purposes [3]. An excellent unit test for this would be to assert
+that a draft blog post returns an empty string from the `content` method, but
+we’re not going to write tests for this example.
-Rust can tell that `'c'` is within the first pattern’s range and prints `early
-ASCII letter`.
+Next, we want to enable a request for a review of the post [4], and we want
+`content` to return an empty string while waiting for the review [5]. When the
+post receives approval [6], it should get published, meaning the text of the
+post will be returned when `content` is called [7].
-### Destructuring to Break Apart Values
+Notice that the only type we’re interacting with from the crate is the `Post`
+type. This type will use the state pattern and will hold a value that will be
+one of three state objects representing the various states a post can be
+in—draft, review, or published. Changing from one state to another will be
+managed internally within the `Post` type. The states change in response to the
+methods called by our library’s users on the `Post` instance, but they don’t
+have to manage the state changes directly. Also, users can’t make a mistake
+with the states, such as publishing a post before it’s reviewed.
-We can also use patterns to destructure structs, enums, and tuples to use
-different parts of these values. Let’s walk through each value.
+### Defining Post and Creating a New Instance in the Draft State
-#### Destructuring Structs
+Let’s get started on the implementation of the library! We know we need a
+public `Post` struct that holds some content, so we’ll start with the
+definition of the struct and an associated public `new` function to create an
+instance of `Post`, as shown in Listing 17-12. We’ll also make a private
+`State` trait that will define the behavior that all state objects for a `Post`
+must have.
-Listing 18-12 shows a `Point` struct with two fields, `x` and `y`, that we can
-break apart using a pattern with a `let` statement.
+Then `Post` will hold a trait object of `Box<dyn State>` inside an `Option<T>`
+in a private field named `state` to hold the state object. You’ll see why the
+`Option<T>` is necessary in a bit.
-Filename: src/main.rs
+Filename: src/lib.rs
```
-struct Point {
- x: i32,
- y: i32,
+pub struct Post {
+ state: Option<Box<dyn State>>,
+ content: String,
}
-fn main() {
- let p = Point { x: 0, y: 7 };
-
- let Point { x: a, y: b } = p;
- assert_eq!(0, a);
- assert_eq!(7, b);
+impl Post {
+ pub fn new() -> Post {
+ Post {
+ 1 state: Some(Box::new(Draft {})),
+ 2 content: String::new(),
+ }
+ }
}
-```
-
-Listing 18-12: Destructuring a struct’s fields into separate variables
-This code creates the variables `a` and `b` that match the values of the `x`
-and `y` fields of the `p` struct. This example shows that the names of the
-variables in the pattern don’t have to match the field names of the struct.
-However, it’s common to match the variable names to the field names to make it
-easier to remember which variables came from which fields. Because of this
-common usage, and because writing `let Point { x: x, y: y } = p;` contains a
-lot of duplication, Rust has a shorthand for patterns that match struct fields:
-you only need to list the name of the struct field, and the variables created
-from the pattern will have the same names. Listing 18-13 behaves in the same
-way as the code in Listing 18-12, but the variables created in the `let`
-pattern are `x` and `y` instead of `a` and `b`.
+trait State {}
-Filename: src/main.rs
+struct Draft {}
+impl State for Draft {}
```
-struct Point {
- x: i32,
- y: i32,
-}
-fn main() {
- let p = Point { x: 0, y: 7 };
-
- let Point { x, y } = p;
- assert_eq!(0, x);
- assert_eq!(7, y);
-}
-```
+Listing 17-12: Definition of a `Post` struct and a `new` function that creates
+a new `Post` instance, a `State` trait, and a `Draft` struct
-Listing 18-13: Destructuring struct fields using struct field shorthand
+The `State` trait defines the behavior shared by different post states. The
+state objects are `Draft`, `PendingReview`, and `Published`, and they will all
+implement the `State` trait. For now, the trait doesn’t have any methods, and
+we’ll start by defining just the `Draft` state because that is the state we
+want a post to start in.
-This code creates the variables `x` and `y` that match the `x` and `y` fields
-of the `p` variable. The outcome is that the variables `x` and `y` contain the
-values from the `p` struct.
+When we create a new `Post`, we set its `state` field to a `Some` value that
+holds a `Box` [1]. This `Box` points to a new instance of the `Draft` struct.
+This ensures that whenever we create a new instance of `Post`, it will start
+out as a draft. Because the `state` field of `Post` is private, there is no way
+to create a `Post` in any other state! In the `Post::new` function, we set the
+`content` field to a new, empty `String` [2].
-We can also destructure with literal values as part of the struct pattern
-rather than creating variables for all the fields. Doing so allows us to test
-some of the fields for particular values while creating variables to
-destructure the other fields.
+### Storing the Text of the Post Content
-In Listing 18-14, we have a `match` expression that separates `Point` values
-into three cases: points that lie directly on the `x` axis (which is true when
-`y = 0`), on the `y` axis (`x = 0`), or on neither axis.
+We saw in Listing 17-11 that we want to be able to call a method named
+`add_text` and pass it a `&str` that is then added as the text content of the
+blog post. We implement this as a method, rather than exposing the `content`
+field as `pub`, so that later we can implement a method that will control how
+the `content` field’s data is read. The `add_text` method is pretty
+straightforward, so let’s add the implementation in Listing 17-13 to the `impl
+Post` block.
-Filename: src/main.rs
+Filename: src/lib.rs
```
-fn main() {
- let p = Point { x: 0, y: 7 };
-
- match p {
- Point { x, y: 0 } => println!("On the x axis at {x}"),
- Point { x: 0, y } => println!("On the y axis at {y}"),
- Point { x, y } => {
- println!("On neither axis: ({x}, {y})");
- }
+impl Post {
+ --snip--
+ pub fn add_text(&mut self, text: &str) {
+ self.content.push_str(text);
}
}
```
-Listing 18-14: Destructuring and matching literal values in one pattern
+Listing 17-13: Implementing the `add_text` method to add text to a post’s
+`content`
-The first arm will match any point that lies on the `x` axis by specifying that
-the `y` field matches if its value matches the literal `0`. The pattern still
-creates an `x` variable that we can use in the code for this arm.
+The `add_text` method takes a mutable reference to `self` because we’re
+changing the `Post` instance that we’re calling `add_text` on. We then call
+`push_str` on the `String` in `content` and pass the `text` argument to add to
+the saved `content`. This behavior doesn’t depend on the state the post is in,
+so it’s not part of the state pattern. The `add_text` method doesn’t interact
+with the `state` field at all, but it is part of the behavior we want to
+support.
-Similarly, the second arm matches any point on the `y` axis by specifying that
-the `x` field matches if its value is `0` and creates a variable `y` for the
-value of the `y` field. The third arm doesn’t specify any literals, so it
-matches any other `Point` and creates variables for both the `x` and `y` fields.
+### Ensuring the Content of a Draft Post Is Empty
-In this example, the value `p` matches the second arm by virtue of `x`
-containing a `0`, so this code will print `On the y axis at 7`.
+Even after we’ve called `add_text` and added some content to our post, we still
+want the `content` method to return an empty string slice because the post is
+still in the draft state, as shown at [3] in Listing 17-11. For now, let’s
+implement the `content` method with the simplest thing that will fulfill this
+requirement: always returning an empty string slice. We’ll change this later
+once we implement the ability to change a post’s state so it can be published.
+So far, posts can only be in the draft state, so the post content should always
+be empty. Listing 17-14 shows this placeholder implementation.
-Remember that a `match` expression stops checking arms once it has found the
-first matching pattern, so even though `Point { x: 0, y: 0}` is on the `x` axis
-and the `y` axis, this code would only print `On the x axis at 0`.
-
-#### Destructuring Enums
-
-We’ve destructured enums in this book (for example, Listing 6-5), but we
-haven’t yet explicitly discussed that the pattern to destructure an enum
-corresponds to the way the data stored within the enum is defined. As an
-example, in Listing 18-15 we use the `Message` enum from Listing 6-2 and write
-a `match` with patterns that will destructure each inner value.
-
-Filename: src/main.rs
+Filename: src/lib.rs
```
-enum Message {
- Quit,
- Move { x: i32, y: i32 },
- Write(String),
- ChangeColor(i32, i32, i32),
-}
-
-fn main() {
- 1 let msg = Message::ChangeColor(0, 160, 255);
-
- match msg {
- 2 Message::Quit => {
- println!(
- "The Quit variant has no data to destructure."
- );
- }
- 3 Message::Move { x, y } => {
- println!(
- "Move in the x dir {x}, in the y dir {y}"
- );
- }
- 4 Message::Write(text) => {
- println!("Text message: {text}");
- }
- 5 Message::ChangeColor(r, g, b) => println!(
- "Change color to red {r}, green {g}, and blue {b}"
- ),
+impl Post {
+ --snip--
+ pub fn content(&self) -> &str {
+ ""
}
}
```
-Listing 18-15: Destructuring enum variants that hold different kinds of values
-
-This code will print `Change color to red 0, green 160, and blue 255`. Try
-changing the value of `msg` [1] to see the code from the other arms run.
+Listing 17-14: Adding a placeholder implementation for the `content` method on
+`Post` that always returns an empty string slice
-For enum variants without any data, like `Message::Quit` [2], we can’t
-destructure the value any further. We can only match on the literal
-`Message::Quit` value, and no variables are in that pattern.
+With this added `content` method, everything in Listing 17-11 up to the line at
+[3] works as intended.
-For struct-like enum variants, such as `Message::Move` [3], we can use a
-pattern similar to the pattern we specify to match structs. After the variant
-name, we place curly brackets and then list the fields with variables so we
-break apart the pieces to use in the code for this arm. Here we use the
-shorthand form as we did in Listing 18-13.
+### Requesting a Review Changes the Post’s State
-For tuple-like enum variants, like `Message::Write` that holds a tuple with one
-element [4] and `Message::ChangeColor` that holds a tuple with three elements
-[5], the pattern is similar to the pattern we specify to match tuples. The
-number of variables in the pattern must match the number of elements in the
-variant we’re matching.
+Next, we need to add functionality to request a review of a post, which should
+change its state from `Draft` to `PendingReview`. Listing 17-15 shows this code.
-#### Destructuring Nested Structs and Enums
-
-So far, our examples have all been matching structs or enums one level deep,
-but matching can work on nested items too! For example, we can refactor the
-code in Listing 18-15 to support RGB and HSV colors in the `ChangeColor`
-message, as shown in Listing 18-16.
-
-Filename: src/main.rs
+Filename: src/lib.rs
```
-enum Color {
- Rgb(i32, i32, i32),
- Hsv(i32, i32, i32),
+impl Post {
+ --snip--
+ 1 pub fn request_review(&mut self) {
+ 2 if let Some(s) = self.state.take() {
+ 3 self.state = Some(s.request_review())
+ }
+ }
}
-enum Message {
- Quit,
- Move { x: i32, y: i32 },
- Write(String),
- ChangeColor(Color),
+trait State {
+ 4 fn request_review(self: Box<Self>) -> Box<dyn State>;
}
-fn main() {
- let msg = Message::ChangeColor(Color::Hsv(0, 160, 255));
-
- match msg {
- Message::ChangeColor(Color::Rgb(r, g, b)) => println!(
- "Change color to red {r}, green {g}, and blue {b}"
- ),
- Message::ChangeColor(Color::Hsv(h, s, v)) => println!(
- "Change color to hue {h}, saturation {s}, value {v}"
- ),
- _ => (),
+struct Draft {}
+
+impl State for Draft {
+ fn request_review(self: Box<Self>) -> Box<dyn State> {
+ 5 Box::new(PendingReview {})
}
}
-```
-
-Listing 18-16: Matching on nested enums
-
-The pattern of the first arm in the `match` expression matches a
-`Message::ChangeColor` enum variant that contains a `Color::Rgb` variant; then
-the pattern binds to the three inner `i32` values. The pattern of the second
-arm also matches a `Message::ChangeColor` enum variant, but the inner enum
-matches `Color::Hsv` instead. We can specify these complex conditions in one
-`match` expression, even though two enums are involved.
-
-#### Destructuring Structs and Tuples
-We can mix, match, and nest destructuring patterns in even more complex ways.
-The following example shows a complicated destructure where we nest structs and
-tuples inside a tuple and destructure all the primitive values out:
+struct PendingReview {}
+impl State for PendingReview {
+ fn request_review(self: Box<Self>) -> Box<dyn State> {
+ 6 self
+ }
+}
```
-let ((feet, inches), Point { x, y }) =
- ((3, 10), Point { x: 3, y: -10 });
-```
-
-This code lets us break complex types into their component parts so we can use
-the values we’re interested in separately.
-Destructuring with patterns is a convenient way to use pieces of values, such
-as the value from each field in a struct, separately from each other.
-
-### Ignoring Values in a Pattern
-
-You’ve seen that it’s sometimes useful to ignore values in a pattern, such as
-in the last arm of a `match`, to get a catchall that doesn’t actually do
-anything but does account for all remaining possible values. There are a few
-ways to ignore entire values or parts of values in a pattern: using the `_`
-pattern (which you’ve seen), using the `_` pattern within another pattern,
-using a name that starts with an underscore, or using `..` to ignore remaining
-parts of a value. Let’s explore how and why to use each of these patterns.
-
-#### An Entire Value with _
-
-We’ve used the underscore as a wildcard pattern that will match any value but
-not bind to the value. This is especially useful as the last arm in a `match`
-expression, but we can also use it in any pattern, including function
-parameters, as shown in Listing 18-17.
-
-Filename: src/main.rs
-
-```
-fn foo(_: i32, y: i32) {
- println!("This code only uses the y parameter: {y}");
+Listing 17-15: Implementing `request_review` methods on `Post` and the `State`
+trait
+
+We give `Post` a public method named `request_review` that will take a mutable
+reference to `self` [1]. Then we call an internal `request_review` method on
+the current state of `Post` [3], and this second `request_review` method
+consumes the current state and returns a new state.
+
+We add the `request_review` method to the `State` trait [4]; all types that
+implement the trait will now need to implement the `request_review` method.
+Note that rather than having `self`, `&self`, or `&mut self` as the first
+parameter of the method, we have `self: Box<Self>`. This syntax means the
+method is only valid when called on a `Box` holding the type. This syntax takes
+ownership of `Box<Self>`, invalidating the old state so the state value of the
+`Post` can transform into a new state.
+
+To consume the old state, the `request_review` method needs to take ownership
+of the state value. This is where the `Option` in the `state` field of `Post`
+comes in: we call the `take` method to take the `Some` value out of the `state`
+field and leave a `None` in its place because Rust doesn’t let us have
+unpopulated fields in structs [2]. This lets us move the `state` value out of
+`Post` rather than borrowing it. Then we’ll set the post’s `state` value to the
+result of this operation.
+
+We need to set `state` to `None` temporarily rather than setting it directly
+with code like `self.state = self.state.request_review();` to get ownership of
+the `state` value. This ensures `Post` can’t use the old `state` value after
+we’ve transformed it into a new state.
+
+The `request_review` method on `Draft` returns a new, boxed instance of a new
+`PendingReview` struct [5], which represents the state when a post is waiting
+for a review. The `PendingReview` struct also implements the `request_review`
+method but doesn’t do any transformations. Rather, it returns itself [6]
+because when we request a review on a post already in the `PendingReview`
+state, it should stay in the `PendingReview` state.
+
+Now we can start seeing the advantages of the state pattern: the
+`request_review` method on `Post` is the same no matter its `state` value. Each
+state is responsible for its own rules.
+
+We’ll leave the `content` method on `Post` as is, returning an empty string
+slice. We can now have a `Post` in the `PendingReview` state as well as in the
+`Draft` state, but we want the same behavior in the `PendingReview` state.
+Listing 17-11 now works up to the line at [5]!
+
+### Adding approve to Change the Behavior of content
+
+The `approve` method will be similar to the `request_review` method: it will
+set `state` to the value that the current state says it should have when that
+state is approved, as shown in Listing 17-16.
+
+Filename: src/lib.rs
+
+```
+impl Post {
+ --snip--
+ pub fn approve(&mut self) {
+ if let Some(s) = self.state.take() {
+ self.state = Some(s.approve())
+ }
+ }
}
-fn main() {
- foo(3, 4);
+trait State {
+ fn request_review(self: Box<Self>) -> Box<dyn State>;
+ fn approve(self: Box<Self>) -> Box<dyn State>;
}
-```
-
-Listing 18-17: Using `_` in a function signature
-This code will completely ignore the value `3` passed as the first argument,
-and will print `This code only uses the y parameter: 4`.
+struct Draft {}
-In most cases when you no longer need a particular function parameter, you
-would change the signature so it doesn’t include the unused parameter. Ignoring
-a function parameter can be especially useful in cases when, for example,
-you’re implementing a trait when you need a certain type signature but the
-function body in your implementation doesn’t need one of the parameters. You
-then avoid getting a compiler warning about unused function parameters, as you
-would if you used a name instead.
-
-#### Parts of a Value with a Nested _
+impl State for Draft {
+ --snip--
+ fn approve(self: Box<Self>) -> Box<dyn State> {
+ 1 self
+ }
+}
-We can also use `_` inside another pattern to ignore just part of a value, for
-example, when we want to test for only part of a value but have no use for the
-other parts in the corresponding code we want to run. Listing 18-18 shows code
-responsible for managing a setting’s value. The business requirements are that
-the user should not be allowed to overwrite an existing customization of a
-setting but can unset the setting and give it a value if it is currently unset.
+struct PendingReview {}
-Filename: src/main.rs
+impl State for PendingReview {
+ --snip--
+ fn approve(self: Box<Self>) -> Box<dyn State> {
+ 2 Box::new(Published {})
+ }
+}
-```
-let mut setting_value = Some(5);
-let new_setting_value = Some(10);
+struct Published {}
-match (setting_value, new_setting_value) {
- (Some(_), Some(_)) => {
- println!("Can't overwrite an existing customized value");
+impl State for Published {
+ fn request_review(self: Box<Self>) -> Box<dyn State> {
+ self
}
- _ => {
- setting_value = new_setting_value;
+
+ fn approve(self: Box<Self>) -> Box<dyn State> {
+ self
}
}
-
-println!("setting is {:?}", setting_value);
```
-Listing 18-18: Using an underscore within patterns that match `Some` variants
-when we don’t need to use the value inside the `Some`
+Listing 17-16: Implementing the `approve` method on `Post` and the `State` trait
-This code will print `Can't overwrite an existing customized value` and then
-`setting is Some(5)`. In the first match arm, we don’t need to match on or use
-the values inside either `Some` variant, but we do need to test for the case
-when `setting_value` and `new_setting_value` are the `Some` variant. In that
-case, we print the reason for not changing `setting_value`, and it doesn’t get
-changed.
+We add the `approve` method to the `State` trait and add a new struct that
+implements `State`, the `Published` state.
-In all other cases (if either `setting_value` or `new_setting_value` is `None`)
-expressed by the `_` pattern in the second arm, we want to allow
-`new_setting_value` to become `setting_value`.
+Similar to the way `request_review` on `PendingReview` works, if we call the
+`approve` method on a `Draft`, it will have no effect because `approve` will
+return `self` [1]. When we call `approve` on `PendingReview`, it returns a new,
+boxed instance of the `Published` struct [2]. The `Published` struct implements
+the `State` trait, and for both the `request_review` method and the `approve`
+method, it returns itself because the post should stay in the `Published` state
+in those cases.
-We can also use underscores in multiple places within one pattern to ignore
-particular values. Listing 18-19 shows an example of ignoring the second and
-fourth values in a tuple of five items.
+Now we need to update the `content` method on `Post`. We want the value
+returned from `content` to depend on the current state of the `Post`, so we’re
+going to have the `Post` delegate to a `content` method defined on its `state`,
+as shown in Listing 17-17.
-Filename: src/main.rs
+Filename: src/lib.rs
```
-let numbers = (2, 4, 8, 16, 32);
-
-match numbers {
- (first, _, third, _, fifth) => {
- println!("Some numbers: {first}, {third}, {fifth}");
+impl Post {
+ --snip--
+ pub fn content(&self) -> &str {
+ self.state.as_ref().unwrap().content(self)
}
+ --snip--
}
```
-Listing 18-19: Ignoring multiple parts of a tuple
+Listing 17-17: Updating the `content` method on `Post` to delegate to a
+`content` method on `State`
-This code will print `Some numbers: 2, 8, 32`, and the values `4` and `16` will
-be ignored.
+Because the goal is to keep all of these rules inside the structs that
+implement `State`, we call a `content` method on the value in `state` and pass
+the post instance (that is, `self`) as an argument. Then we return the value
+that’s returned from using the `content` method on the `state` value.
-#### An Unused Variable by Starting Its Name with _
+We call the `as_ref` method on the `Option` because we want a reference to the
+value inside the `Option` rather than ownership of the value. Because `state`
+is an `Option<Box<dyn State>>`, when we call `as_ref`, an `Option<&Box<dyn
+State>>` is returned. If we didn’t call `as_ref`, we would get an error because
+we can’t move `state` out of the borrowed `&self` of the function parameter.
-If you create a variable but don’t use it anywhere, Rust will usually issue a
-warning because an unused variable could be a bug. However, sometimes it’s
-useful to be able to create a variable you won’t use yet, such as when you’re
-prototyping or just starting a project. In this situation, you can tell Rust
-not to warn you about the unused variable by starting the name of the variable
-with an underscore. In Listing 18-20, we create two unused variables, but when
-we compile this code, we should only get a warning about one of them.
+We then call the `unwrap` method, which we know will never panic because we
+know the methods on `Post` ensure that `state` will always contain a `Some`
+value when those methods are done. This is one of the cases we talked about in
+“Cases in Which You Have More Information Than the Compiler” on page XX when we
+know that a `None` value is never possible, even though the compiler isn’t able
+to understand that.
-Filename: src/main.rs
+At this point, when we call `content` on the `&Box<dyn State>`, deref coercion
+will take effect on the `&` and the `Box` so the `content` method will
+ultimately be called on the type that implements the `State` trait. That means
+we need to add `content` to the `State` trait definition, and that is where
+we’ll put the logic for what content to return depending on which state we
+have, as shown in Listing 17-18.
+
+Filename: src/lib.rs
```
-fn main() {
- let _x = 5;
- let y = 10;
+trait State {
+ --snip--
+ fn content<'a>(&self, post: &'a Post) -> &'a str {
+ 1 ""
+ }
}
-```
-
-Listing 18-20: Starting a variable name with an underscore to avoid getting
-unused variable warnings
-Here, we get a warning about not using the variable `y`, but we don’t get a
-warning about not using `_x`.
+--snip--
+struct Published {}
-Note that there is a subtle difference between using only `_` and using a name
-that starts with an underscore. The syntax `_x` still binds the value to the
-variable, whereas `_` doesn’t bind at all. To show a case where this
-distinction matters, Listing 18-21 will provide us with an error.
-
-Filename: src/main.rs
-
-```
-let s = Some(String::from("Hello!"));
-
-if let Some(_s) = s {
- println!("found a string");
+impl State for Published {
+ --snip--
+ fn content<'a>(&self, post: &'a Post) -> &'a str {
+ 2 &post.content
+ }
}
-
-println!("{:?}", s);
```
-Listing 18-21: An unused variable starting with an underscore still binds the
-value, which might take ownership of the value.
-
-We’ll receive an error because the `s` value will still be moved into `_s`,
-which prevents us from using `s` again. However, using the underscore by itself
-doesn’t ever bind to the value. Listing 18-22 will compile without any errors
-because `s` doesn’t get moved into `_`.
+Listing 17-18: Adding the `content` method to the `State` trait
+
+We add a default implementation for the `content` method that returns an empty
+string slice [1]. That means we don’t need to implement `content` on the
+`Draft` and `PendingReview` structs. The `Published` struct will override the
+`content` method and return the value in `post.content` [2].
+
+Note that we need lifetime annotations on this method, as we discussed in
+Chapter 10. We’re taking a reference to a `post` as an argument and returning a
+reference to part of that `post`, so the lifetime of the returned reference is
+related to the lifetime of the `post` argument.
+
+And we’re done—all of Listing 17-11 now works! We’ve implemented the state
+pattern with the rules of the blog post workflow. The logic related to the
+rules lives in the state objects rather than being scattered throughout `Post`.
+
+> ### Why Not An Enum?
+>
+> You may have been wondering why we didn’t use an `enum` with the different
+possible post states as variants. That’s certainly a possible solution; try it
+and compare the end results to see which you prefer! One disadvantage of using
+an enum is that every place that checks the value of the enum will need a
+`match` expression or similar to handle every possible variant. This could get
+more repetitive than this trait object solution.
+
+### Trade-offs of the State Pattern
+
+We’ve shown that Rust is capable of implementing the object-oriented state
+pattern to encapsulate the different kinds of behavior a post should have in
+each state. The methods on `Post` know nothing about the various behaviors. The
+way we organized the code, we have to look in only one place to know the
+different ways a published post can behave: the implementation of the `State`
+trait on the `Published` struct.
+
+If we were to create an alternative implementation that didn’t use the state
+pattern, we might instead use `match` expressions in the methods on `Post` or
+even in the `main` code that checks the state of the post and changes behavior
+in those places. That would mean we would have to look in several places to
+understand all the implications of a post being in the published state! This
+would only increase the more states we added: each of those `match` expressions
+would need another arm.
+
+With the state pattern, the `Post` methods and the places we use `Post` don’t
+need `match` expressions, and to add a new state, we would only need to add a
+new struct and implement the trait methods on that one struct.
+
+The implementation using the state pattern is easy to extend to add more
+functionality. To see the simplicity of maintaining code that uses the state
+pattern, try a few of these suggestions:
+
+* Add a `reject` method that changes the post’s state from `PendingReview` back
+to `Draft`.
+* Require two calls to `approve` before the state can be changed to `Published`.
+* Allow users to add text content only when a post is in the `Draft` state.
+Hint: have the state object responsible for what might change about the content
+but not responsible for modifying the `Post`.
+
+One downside of the state pattern is that, because the states implement the
+transitions between states, some of the states are coupled to each other. If we
+add another state between `PendingReview` and `Published`, such as `Scheduled`,
+we would have to change the code in `PendingReview` to transition to
+`Scheduled` instead. It would be less work if `PendingReview` didn’t need to
+change with the addition of a new state, but that would mean switching to
+another design pattern.
+
+Another downside is that we’ve duplicated some logic. To eliminate some of the
+duplication, we might try to make default implementations for the
+`request_review` and `approve` methods on the `State` trait that return `self`.
+However, this wouldn’t work: when using `State` as a trait object, the trait
+doesn’t know what the concrete `self` will be exactly, so the return type isn’t
+known at compile time.
+
+Other duplication includes the similar implementations of the `request_review`
+and `approve` methods on `Post`. Both methods delegate to the implementation of
+the same method on the value in the `state` field of `Option` and set the new
+value of the `state` field to the result. If we had a lot of methods on `Post`
+that followed this pattern, we might consider defining a macro to eliminate the
+repetition (see “Macros” on page XX).
+
+By implementing the state pattern exactly as it’s defined for object-oriented
+languages, we’re not taking as full advantage of Rust’s strengths as we could.
+Let’s look at some changes we can make to the `blog` crate that can make
+invalid states and transitions into compile-time errors.
+
+#### Encoding States and Behavior as Types
+
+We’ll show you how to rethink the state pattern to get a different set of
+trade-offs. Rather than encapsulating the states and transitions completely so
+outside code has no knowledge of them, we’ll encode the states into different
+types. Consequently, Rust’s type checking system will prevent attempts to use
+draft posts where only published posts are allowed by issuing a compiler error.
+
+Let’s consider the first part of `main` in Listing 17-11:
Filename: src/main.rs
```
-let s = Some(String::from("Hello!"));
+fn main() {
+ let mut post = Post::new();
-if let Some(_) = s {
- println!("found a string");
+ post.add_text("I ate a salad for lunch today");
+ assert_eq!("", post.content());
}
-
-println!("{:?}", s);
```
-Listing 18-22: Using an underscore does not bind the value.
-
-This code works just fine because we never bind `s` to anything; it isn’t moved.
-
-#### Remaining Parts of a Value with ..
+We still enable the creation of new posts in the draft state using `Post::new`
+and the ability to add text to the post’s content. But instead of having a
+`content` method on a draft post that returns an empty string, we’ll make it so
+draft posts don’t have the `content` method at all. That way, if we try to get
+a draft post’s content, we’ll get a compiler error telling us the method
+doesn’t exist. As a result, it will be impossible for us to accidentally
+display draft post content in production because that code won’t even compile.
+Listing 17-19 shows the definition of a `Post` struct and a `DraftPost` struct,
+as well as methods on each.
-With values that have many parts, we can use the `..` syntax to use specific
-parts and ignore the rest, avoiding the need to list underscores for each
-ignored value. The `..` pattern ignores any parts of a value that we haven’t
-explicitly matched in the rest of the pattern. In Listing 18-23, we have a
-`Point` struct that holds a coordinate in three-dimensional space. In the
-`match` expression, we want to operate only on the `x` coordinate and ignore
-the values in the `y` and `z` fields.
-
-Filename: src/main.rs
+Filename: src/lib.rs
```
-struct Point {
- x: i32,
- y: i32,
- z: i32,
+pub struct Post {
+ content: String,
}
-let origin = Point { x: 0, y: 0, z: 0 };
-
-match origin {
- Point { x, .. } => println!("x is {x}"),
+pub struct DraftPost {
+ content: String,
}
-```
-
-Listing 18-23: Ignoring all fields of a `Point` except for `x` by using `..`
-
-We list the `x` value and then just include the `..` pattern. This is quicker
-than having to list `y: _` and `z: _`, particularly when we’re working with
-structs that have lots of fields in situations where only one or two fields are
-relevant.
-
-The syntax `..` will expand to as many values as it needs to be. Listing 18-24
-shows how to use `..` with a tuple.
-
-Filename: src/main.rs
-```
-fn main() {
- let numbers = (2, 4, 8, 16, 32);
-
- match numbers {
- (first, .., last) => {
- println!("Some numbers: {first}, {last}");
+impl Post {
+ 1 pub fn new() -> DraftPost {
+ DraftPost {
+ content: String::new(),
}
}
-}
-```
-
-Listing 18-24: Matching only the first and last values in a tuple and ignoring
-all other values
-
-In this code, the first and last values are matched with `first` and `last`.
-The `..` will match and ignore everything in the middle.
-
-However, using `..` must be unambiguous. If it is unclear which values are
-intended for matching and which should be ignored, Rust will give us an error.
-Listing 18-25 shows an example of using `..` ambiguously, so it will not
-compile.
-Filename: src/main.rs
-
-```
-fn main() {
- let numbers = (2, 4, 8, 16, 32);
+ 2 pub fn content(&self) -> &str {
+ &self.content
+ }
+}
- match numbers {
- (.., second, ..) => {
- println!("Some numbers: {second}");
- },
+impl DraftPost {
+ 3 pub fn add_text(&mut self, text: &str) {
+ self.content.push_str(text);
}
}
```
-Listing 18-25: An attempt to use `..` in an ambiguous way
+Listing 17-19: A `Post` with a `content` method and a `DraftPost` without a
+`content` method
-When we compile this example, we get this error:
+Both the `Post` and `DraftPost` structs have a private `content` field that
+stores the blog post text. The structs no longer have the `state` field because
+we’re moving the encoding of the state to the types of the structs. The `Post`
+struct will represent a published post, and it has a `content` method that
+returns the `content` [2].
-```
-error: `..` can only be used once per tuple pattern
- --> src/main.rs:5:22
- |
-5 | (.., second, ..) => {
- | -- ^^ can only be used once per tuple pattern
- | |
- | previously used here
-```
+We still have a `Post::new` function, but instead of returning an instance of
+`Post`, it returns an instance of `DraftPost` [1]. Because `content` is private
+and there aren’t any functions that return `Post`, it’s not possible to create
+an instance of `Post` right now.
-It’s impossible for Rust to determine how many values in the tuple to ignore
-before matching a value with `second` and then how many further values to
-ignore thereafter. This code could mean that we want to ignore `2`, bind
-`second` to `4`, and then ignore `8`, `16`, and `32`; or that we want to ignore
-`2` and `4`, bind `second` to `8`, and then ignore `16` and `32`; and so forth.
-The variable name `second` doesn’t mean anything special to Rust, so we get a
-compiler error because using `..` in two places like this is ambiguous.
+The `DraftPost` struct has an `add_text` method, so we can add text to
+`content` as before [3], but note that `DraftPost` does not have a `content`
+method defined! So now the program ensures all posts start as draft posts, and
+draft posts don’t have their content available for display. Any attempt to get
+around these constraints will result in a compiler error.
-### Extra Conditionals with Match Guards
+#### Implementing Transitions as Transformations into Different Types
-A *match guard* is an additional `if` condition, specified after the pattern in
-a `match` arm, that must also match for that arm to be chosen. Match guards are
-useful for expressing more complex ideas than a pattern alone allows.
+So how do we get a published post? We want to enforce the rule that a draft
+post has to be reviewed and approved before it can be published. A post in the
+pending review state should still not display any content. Let’s implement
+these constraints by adding another struct, `PendingReviewPost`, defining the
+`request_review` method on `DraftPost` to return a `PendingReviewPost` and
+defining an `approve` method on `PendingReviewPost` to return a `Post`, as
+shown in Listing 17-20.
-The condition can use variables created in the pattern. Listing 18-26 shows a
-`match` where the first arm has the pattern `Some(x)` and also has a match
-guard of `if x % 2 == 0` (which will be `true` if the number is even).
-
-Filename: src/main.rs
+Filename: src/lib.rs
```
-let num = Some(4);
-
-match num {
- Some(x) if x % 2 == 0 => println!("The number {x} is even"),
- Some(x) => println!("The number {x} is odd"),
- None => (),
+impl DraftPost {
+ --snip--
+ pub fn request_review(self) -> PendingReviewPost {
+ PendingReviewPost {
+ content: self.content,
+ }
+ }
}
-```
-
-Listing 18-26: Adding a match guard to a pattern
-
-This example will print `The number 4 is even`. When `num` is compared to the
-pattern in the first arm, it matches because `Some(4)` matches `Some(x)`. Then
-the match guard checks whether the remainder of dividing `x` by 2 is equal to
-0, and because it is, the first arm is selected.
-If `num` had been `Some(5)` instead, the match guard in the first arm would
-have been `false` because the remainder of 5 divided by 2 is 1, which is not
-equal to 0. Rust would then go to the second arm, which would match because the
-second arm doesn’t have a match guard and therefore matches any `Some` variant.
-
-There is no way to express the `if x % 2 == 0` condition within a pattern, so
-the match guard gives us the ability to express this logic. The downside of
-this additional expressiveness is that the compiler doesn’t try to check for
-exhaustiveness when match guard expressions are involved.
-
-In Listing 18-11, we mentioned that we could use match guards to solve our
-pattern-shadowing problem. Recall that we created a new variable inside the
-pattern in the `match` expression instead of using the variable outside the
-`match`. That new variable meant we couldn’t test against the value of the
-outer variable. Listing 18-27 shows how we can use a match guard to fix this
-problem.
-
-Filename: src/main.rs
-
-```
-fn main() {
- let x = Some(5);
- let y = 10;
+pub struct PendingReviewPost {
+ content: String,
+}
- match x {
- Some(50) => println!("Got 50"),
- Some(n) if n == y => println!("Matched, n = {n}"),
- _ => println!("Default case, x = {:?}", x),
+impl PendingReviewPost {
+ pub fn approve(self) -> Post {
+ Post {
+ content: self.content,
+ }
}
-
- println!("at the end: x = {:?}, y = {y}", x);
}
```
-Listing 18-27: Using a match guard to test for equality with an outer variable
-
-This code will now print `Default case, x = Some(5)`. The pattern in the second
-match arm doesn’t introduce a new variable `y` that would shadow the outer `y`,
-meaning we can use the outer `y` in the match guard. Instead of specifying the
-pattern as `Some(y)`, which would have shadowed the outer `y`, we specify
-`Some(n)`. This creates a new variable `n` that doesn’t shadow anything because
-there is no `n` variable outside the `match`.
-
-The match guard `if n == y` is not a pattern and therefore doesn’t introduce
-new variables. This `y` *is* the outer `y` rather than a new shadowed `y`, and
-we can look for a value that has the same value as the outer `y` by comparing
-`n` to `y`.
-
-You can also use the *or* operator `|` in a match guard to specify multiple
-patterns; the match guard condition will apply to all the patterns. Listing
-18-28 shows the precedence when combining a pattern that uses `|` with a match
-guard. The important part of this example is that the `if y` match guard
-applies to `4`, `5`, *and* `6`, even though it might look like `if y` only
-applies to `6`.
+Listing 17-20: A `PendingReviewPost` that gets created by calling
+`request_review` on `DraftPost` and an `approve` method that turns a
+`PendingReviewPost` into a published `Post`
+
+The `request_review` and `approve` methods take ownership of `self`, thus
+consuming the `DraftPost` and `PendingReviewPost` instances and transforming
+them into a `PendingReviewPost` and a published `Post`, respectively. This way,
+we won’t have any lingering `DraftPost` instances after we’ve called
+`request_review` on them, and so forth. The `PendingReviewPost` struct doesn’t
+have a `content` method defined on it, so attempting to read its content
+results in a compiler error, as with `DraftPost`. Because the only way to get a
+published `Post` instance that does have a `content` method defined is to call
+the `approve` method on a `PendingReviewPost`, and the only way to get a
+`PendingReviewPost` is to call the `request_review` method on a `DraftPost`,
+we’ve now encoded the blog post workflow into the type system.
+
+But we also have to make some small changes to `main`. The `request_review` and
+`approve` methods return new instances rather than modifying the struct they’re
+called on, so we need to add more `let post =` shadowing assignments to save
+the returned instances. We also can’t have the assertions about the draft and
+pending review posts’ contents be empty strings, nor do we need them: we can’t
+compile code that tries to use the content of posts in those states any longer.
+The updated code in `main` is shown in Listing 17-21.
Filename: src/main.rs
```
-let x = 4;
-let y = false;
-
-match x {
- 4 | 5 | 6 if y => println!("yes"),
- _ => println!("no"),
-}
-```
-
-Listing 18-28: Combining multiple patterns with a match guard
-
-The match condition states that the arm only matches if the value of `x` is
-equal to `4`, `5`, or `6` *and* if `y` is `true`. When this code runs, the
-pattern of the first arm matches because `x` is `4`, but the match guard `if y`
-is `false`, so the first arm is not chosen. The code moves on to the second
-arm, which does match, and this program prints `no`. The reason is that the
-`if` condition applies to the whole pattern `4 | 5 | 6`, not just to the last
-value `6`. In other words, the precedence of a match guard in relation to a
-pattern behaves like this:
-
-```
-(4 | 5 | 6) if y => ...
-```
-
-rather than this:
-
-```
-4 | 5 | (6 if y) => ...
-```
-
-After running the code, the precedence behavior is evident: if the match guard
-were applied only to the final value in the list of values specified using the
-`|` operator, the arm would have matched and the program would have printed
-`yes`.
+use blog::Post;
-### @ Bindings
-
-The *at* operator `@` lets us create a variable that holds a value at the same
-time we’re testing that value for a pattern match. In Listing 18-29, we want to
-test that a `Message::Hello` `id` field is within the range `3..=7`. We also
-want to bind the value to the variable `id_variable` so we can use it in the
-code associated with the arm. We could name this variable `id`, the same as the
-field, but for this example we’ll use a different name.
+fn main() {
+ let mut post = Post::new();
-Filename: src/main.rs
+ post.add_text("I ate a salad for lunch today");
-```
-enum Message {
- Hello { id: i32 },
-}
+ let post = post.request_review();
-let msg = Message::Hello { id: 5 };
+ let post = post.approve();
-match msg {
- Message::Hello {
- id: id_variable @ 3..=7,
- } => println!("Found an id in range: {id_variable}"),
- Message::Hello { id: 10..=12 } => {
- println!("Found an id in another range")
- }
- Message::Hello { id } => println!("Some other id: {id}"),
+ assert_eq!("I ate a salad for lunch today", post.content());
}
```
-Listing 18-29: Using `@` to bind to a value in a pattern while also testing it
+Listing 17-21: Modifications to `main` to use the new implementation of the
+blog post workflow
-This example will print `Found an id in range: 5`. By specifying `id_variable
-@` before the range `3..=7`, we’re capturing whatever value matched the range
-while also testing that the value matched the range pattern.
+The changes we needed to make to `main` to reassign `post` mean that this
+implementation doesn’t quite follow the object-oriented state pattern anymore:
+the transformations between the states are no longer encapsulated entirely
+within the `Post` implementation. However, our gain is that invalid states are
+now impossible because of the type system and the type checking that happens at
+compile time! This ensures that certain bugs, such as display of the content of
+an unpublished post, will be discovered before they make it to production.
-In the second arm, where we only have a range specified in the pattern, the
-code associated with the arm doesn’t have a variable that contains the actual
-value of the `id` field. The `id` field’s value could have been 10, 11, or 12,
-but the code that goes with that pattern doesn’t know which it is. The pattern
-code isn’t able to use the value from the `id` field because we haven’t saved
-the `id` value in a variable.
+Try the tasks suggested at the start of this section on the `blog` crate as it
+is after Listing 17-21 to see what you think about the design of this version
+of the code. Note that some of the tasks might be completed already in this
+design.
-In the last arm, where we’ve specified a variable without a range, we do have
-the value available to use in the arm’s code in a variable named `id`. The
-reason is that we’ve used the struct field shorthand syntax. But we haven’t
-applied any test to the value in the `id` field in this arm, as we did with the
-first two arms: any value would match this pattern.
-
-Using `@` lets us test a value and save it in a variable within one pattern.
+We’ve seen that even though Rust is capable of implementing object-oriented
+design patterns, other patterns, such as encoding state into the type system,
+are also available in Rust. These patterns have different trade-offs. Although
+you might be very familiar with object-oriented patterns, rethinking the
+problem to take advantage of Rust’s features can provide benefits, such as
+preventing some bugs at compile time. Object-oriented patterns won’t always be
+the best solution in Rust due to certain features, like ownership, that
+object-oriented languages don’t have.
## Summary
-Rust’s patterns are very useful in distinguishing between different kinds of
-data. When used in `match` expressions, Rust ensures your patterns cover every
-possible value, or your program won’t compile. Patterns in `let` statements and
-function parameters make those constructs more useful, enabling the
-destructuring of values into smaller parts at the same time as assigning to
-variables. We can create simple or complex patterns to suit our needs.
-
-Next, for the penultimate chapter of the book, we’ll look at some advanced
-aspects of a variety of Rust’s features.
+Regardless of whether you think Rust is an object-oriented language after
+reading this chapter, you now know that you can use trait objects to get some
+object-oriented features in Rust. Dynamic dispatch can give your code some
+flexibility in exchange for a bit of runtime performance. You can use this
+flexibility to implement object-oriented patterns that can help your code’s
+maintainability. Rust also has other features, like ownership, that
+object-oriented languages don’t have. An object-oriented pattern won’t always
+be the best way to take advantage of Rust’s strengths, but it is an available
+option.
+
+Next, we’ll look at patterns, which are another of Rust’s features that enable
+lots of flexibility. We’ve looked at them briefly throughout the book but
+haven’t seen their full capability yet. Let’s go!
diff --git a/rustbook-en/nostarch/chapter19.md b/rustbook-en/nostarch/chapter19.md
index 410e7eb62..40c7f10a1 100644
--- a/rustbook-en/nostarch/chapter19.md
+++ b/rustbook-en/nostarch/chapter19.md
@@ -6,2291 +6,1287 @@ directory, so all fixes need to be made in `/src/`.
[TOC]
-# Advanced Features
-
-By now, you’ve learned the most commonly used parts of the Rust programming
-language. Before we do one more project, in Chapter 20, we’ll look at a few
-aspects of the language you might run into every once in a while, but may not
-use every day. You can use this chapter as a reference for when you encounter
-any unknowns. The features covered here are useful in very specific situations.
-Although you might not reach for them often, we want to make sure you have a
-grasp of all the features Rust has to offer.
-
-In this chapter, we’ll cover:
-
-* Unsafe Rust: how to opt out of some of Rust’s guarantees and take
-responsibility for manually upholding those guarantees
-* Advanced traits: associated types, default type parameters, fully qualified
-syntax, supertraits, and the newtype pattern in relation to traits
-* Advanced types: more about the newtype pattern, type aliases, the never type,
-and dynamically sized types
-* Advanced functions and closures: function pointers and returning closures
-* Macros: ways to define code that defines more code at compile time
-
-It’s a panoply of Rust features with something for everyone! Let’s dive in!
-
-## Unsafe Rust
-
-All the code we’ve discussed so far has had Rust’s memory safety guarantees
-enforced at compile time. However, Rust has a second language hidden inside it
-that doesn’t enforce these memory safety guarantees: it’s called *unsafe Rust*
-and works just like regular Rust, but gives us extra superpowers.
-
-Unsafe Rust exists because, by nature, static analysis is conservative. When
-the compiler tries to determine whether or not code upholds the guarantees,
-it’s better for it to reject some valid programs than to accept some invalid
-programs. Although the code *might* be okay, if the Rust compiler doesn’t have
-enough information to be confident, it will reject the code. In these cases,
-you can use unsafe code to tell the compiler, “Trust me, I know what I’m
-doing.” Be warned, however, that you use unsafe Rust at your own risk: if you
-use unsafe code incorrectly, problems can occur due to memory unsafety, such as
-null pointer dereferencing.
-
-Another reason Rust has an unsafe alter ego is that the underlying computer
-hardware is inherently unsafe. If Rust didn’t let you do unsafe operations, you
-couldn’t do certain tasks. Rust needs to allow you to do low-level systems
-programming, such as directly interacting with the operating system or even
-writing your own operating system. Working with low-level systems programming
-is one of the goals of the language. Let’s explore what we can do with unsafe
-Rust and how to do it.
-
-### Unsafe Superpowers
-
-To switch to unsafe Rust, use the `unsafe` keyword and then start a new block
-that holds the unsafe code. You can take five actions in unsafe Rust that you
-can’t in safe Rust, which we call *unsafe superpowers*. Those superpowers
-include the ability to:
-
-1. Dereference a raw pointer
-1. Call an unsafe function or method
-1. Access or modify a mutable static variable
-1. Implement an unsafe trait
-1. Access fields of `union`s
-
-It’s important to understand that `unsafe` doesn’t turn off the borrow checker
-or disable any of Rust’s other safety checks: if you use a reference in unsafe
-code, it will still be checked. The `unsafe` keyword only gives you access to
-these five features that are then not checked by the compiler for memory
-safety. You’ll still get some degree of safety inside an unsafe block.
-
-In addition, `unsafe` does not mean the code inside the block is necessarily
-dangerous or that it will definitely have memory safety problems: the intent is
-that as the programmer, you’ll ensure the code inside an `unsafe` block will
-access memory in a valid way.
-
-People are fallible and mistakes will happen, but by requiring these five
-unsafe operations to be inside blocks annotated with `unsafe`, you’ll know that
-any errors related to memory safety must be within an `unsafe` block. Keep
-`unsafe` blocks small; you’ll be thankful later when you investigate memory
-bugs.
-
-To isolate unsafe code as much as possible, it’s best to enclose such code
-within a safe abstraction and provide a safe API, which we’ll discuss later in
-the chapter when we examine unsafe functions and methods. Parts of the standard
-library are implemented as safe abstractions over unsafe code that has been
-audited. Wrapping unsafe code in a safe abstraction prevents uses of `unsafe`
-from leaking out into all the places that you or your users might want to use
-the functionality implemented with `unsafe` code, because using a safe
-abstraction is safe.
-
-Let’s look at each of the five unsafe superpowers in turn. We’ll also look at
-some abstractions that provide a safe interface to unsafe code.
-
-### Dereferencing a Raw Pointer
-
-In “Dangling References” on page XX, we mentioned that the compiler ensures
-references are always valid. Unsafe Rust has two new types called *raw
-pointers* that are similar to references. As with references, raw pointers can
-be immutable or mutable and are written as `*const T` and `*mut T`,
-respectively. The asterisk isn’t the dereference operator; it’s part of the
-type name. In the context of raw pointers, *immutable* means that the pointer
-can’t be directly assigned to after being dereferenced.
-
-Different from references and smart pointers, raw pointers:
-
-* Are allowed to ignore the borrowing rules by having both immutable and
-mutable pointers or multiple mutable pointers to the same location
-* Aren’t guaranteed to point to valid memory
-* Are allowed to be null
-* Don’t implement any automatic cleanup
+# Patterns and Matching
-By opting out of having Rust enforce these guarantees, you can give up
-guaranteed safety in exchange for greater performance or the ability to
-interface with another language or hardware where Rust’s guarantees don’t apply.
+*Patterns* are a special syntax in Rust for matching against the structure of
+types, both complex and simple. Using patterns in conjunction with `match`
+expressions and other constructs gives you more control over a program’s
+control flow. A pattern consists of some combination of the following:
-Listing 19-1 shows how to create an immutable and a mutable raw pointer from
-references.
-
-```
-let mut num = 5;
-
-let r1 = &num as *const i32;
-let r2 = &mut num as *mut i32;
-```
+* Literals
+* Destructured arrays, enums, structs, or tuples
+* Variables
+* Wildcards
+* Placeholders
-Listing 19-1: Creating raw pointers from references
+Some example patterns include `x`, `(a, 3)`, and `Some(Color::Red)`. In the
+contexts in which patterns are valid, these components describe the shape of
+data. Our program then matches values against the patterns to determine whether
+it has the correct shape of data to continue running a particular piece of code.
-Notice that we don’t include the `unsafe` keyword in this code. We can create
-raw pointers in safe code; we just can’t dereference raw pointers outside an
-unsafe block, as you’ll see in a bit.
+To use a pattern, we compare it to some value. If the pattern matches the
+value, we use the value parts in our code. Recall the `match` expressions in
+Chapter 6 that used patterns, such as the coin-sorting machine example. If the
+value fits the shape of the pattern, we can use the named pieces. If it
+doesn’t, the code associated with the pattern won’t run.
-We’ve created raw pointers by using `as` to cast an immutable and a mutable
-reference into their corresponding raw pointer types. Because we created them
-directly from references guaranteed to be valid, we know these particular raw
-pointers are valid, but we can’t make that assumption about just any raw
-pointer.
+This chapter is a reference on all things related to patterns. We’ll cover the
+valid places to use patterns, the difference between refutable and irrefutable
+patterns, and the different kinds of pattern syntax that you might see. By the
+end of the chapter, you’ll know how to use patterns to express many concepts in
+a clear way.
-To demonstrate this, next we’ll create a raw pointer whose validity we can’t be
-so certain of. Listing 19-2 shows how to create a raw pointer to an arbitrary
-location in memory. Trying to use arbitrary memory is undefined: there might be
-data at that address or there might not, the compiler might optimize the code
-so there is no memory access, or the program might terminate with a
-segmentation fault. Usually, there is no good reason to write code like this,
-but it is possible.
+## All the Places Patterns Can Be Used
-```
-let address = 0x012345usize;
-let r = address as *const i32;
-```
+Patterns pop up in a number of places in Rust, and you’ve been using them a lot
+without realizing it! This section discusses all the places where patterns are
+valid.
-Listing 19-2: Creating a raw pointer to an arbitrary memory address
+### match Arms
-Recall that we can create raw pointers in safe code, but we can’t *dereference*
-raw pointers and read the data being pointed to. In Listing 19-3, we use the
-dereference operator `*` on a raw pointer that requires an `unsafe` block.
+As discussed in Chapter 6, we use patterns in the arms of `match` expressions.
+Formally, `match` expressions are defined as the keyword `match`, a value to
+match on, and one or more match arms that consist of a pattern and an
+expression to run if the value matches that arm’s pattern, like this:
```
-let mut num = 5;
-
-let r1 = &num as *const i32;
-let r2 = &mut num as *mut i32;
-
-unsafe {
- println!("r1 is: {}", *r1);
- println!("r2 is: {}", *r2);
+match VALUE {
+ PATTERN => EXPRESSION,
+ PATTERN => EXPRESSION,
+ PATTERN => EXPRESSION,
}
```
-Listing 19-3: Dereferencing raw pointers within an `unsafe` block
-
-Creating a pointer does no harm; it’s only when we try to access the value that
-it points at that we might end up dealing with an invalid value.
-
-Note also that in Listings 19-1 and 19-3, we created `*const i32` and `*mut
-i32` raw pointers that both pointed to the same memory location, where `num` is
-stored. If we instead tried to create an immutable and a mutable reference to
-`num`, the code would not have compiled because Rust’s ownership rules don’t
-allow a mutable reference at the same time as any immutable references. With
-raw pointers, we can create a mutable pointer and an immutable pointer to the
-same location and change data through the mutable pointer, potentially creating
-a data race. Be careful!
-
-With all of these dangers, why would you ever use raw pointers? One major use
-case is when interfacing with C code, as you’ll see in “Calling an Unsafe
-Function or Method” on page XX. Another case is when building up safe
-abstractions that the borrow checker doesn’t understand. We’ll introduce unsafe
-functions and then look at an example of a safe abstraction that uses unsafe
-code.
-
-### Calling an Unsafe Function or Method
-
-The second type of operation you can perform in an unsafe block is calling
-unsafe functions. Unsafe functions and methods look exactly like regular
-functions and methods, but they have an extra `unsafe` before the rest of the
-definition. The `unsafe` keyword in this context indicates the function has
-requirements we need to uphold when we call this function, because Rust can’t
-guarantee we’ve met these requirements. By calling an unsafe function within an
-`unsafe` block, we’re saying that we’ve read this function’s documentation and
-we take responsibility for upholding the function’s contracts.
-
-Here is an unsafe function named `dangerous` that doesn’t do anything in its
-body:
-
-```
-unsafe fn dangerous() {}
-
-unsafe {
- dangerous();
-}
-```
-
-We must call the `dangerous` function within a separate `unsafe` block. If we
-try to call `dangerous` without the `unsafe` block, we’ll get an error:
-
-```
-error[E0133]: call to unsafe function is unsafe and requires
-unsafe function or block
- --> src/main.rs:4:5
- |
-4 | dangerous();
- | ^^^^^^^^^^^ call to unsafe function
- |
- = note: consult the function's documentation for information on
-how to avoid undefined behavior
-```
-
-With the `unsafe` block, we’re asserting to Rust that we’ve read the function’s
-documentation, we understand how to use it properly, and we’ve verified that
-we’re fulfilling the contract of the function.
-
-Bodies of unsafe functions are effectively `unsafe` blocks, so to perform other
-unsafe operations within an unsafe function, we don’t need to add another
-`unsafe` block.
-
-#### Creating a Safe Abstraction over Unsafe Code
-
-Just because a function contains unsafe code doesn’t mean we need to mark the
-entire function as unsafe. In fact, wrapping unsafe code in a safe function is
-a common abstraction. As an example, let’s study the `split_at_mut` function
-from the standard library, which requires some unsafe code. We’ll explore how
-we might implement it. This safe method is defined on mutable slices: it takes
-one slice and makes it two by splitting the slice at the index given as an
-argument. Listing 19-4 shows how to use `split_at_mut`.
-
-```
-let mut v = vec![1, 2, 3, 4, 5, 6];
-
-let r = &mut v[..];
-
-let (a, b) = r.split_at_mut(3);
+For example, here’s the `match` expression from Listing 6-5 that matches on an
+`Option<i32>` value in the variable `x`:
-assert_eq!(a, &mut [1, 2, 3]);
-assert_eq!(b, &mut [4, 5, 6]);
```
-
-Listing 19-4: Using the safe `split_at_mut` function
-
-We can’t implement this function using only safe Rust. An attempt might look
-something like Listing 19-5, which won’t compile. For simplicity, we’ll
-implement `split_at_mut` as a function rather than a method and only for slices
-of `i32` values rather than for a generic type `T`.
-
-```
-fn split_at_mut(
- values: &mut [i32],
- mid: usize,
-) -> (&mut [i32], &mut [i32]) {
- let len = values.len();
-
- assert!(mid <= len);
-
- (&mut values[..mid], &mut values[mid..])
+match x {
+ None => None,
+ Some(i) => Some(i + 1),
}
```
-Listing 19-5: An attempted implementation of `split_at_mut` using only safe Rust
-
-This function first gets the total length of the slice. Then it asserts that
-the index given as a parameter is within the slice by checking whether it’s
-less than or equal to the length. The assertion means that if we pass an index
-that is greater than the length to split the slice at, the function will panic
-before it attempts to use that index.
-
-Then we return two mutable slices in a tuple: one from the start of the
-original slice to the `mid` index and another from `mid` to the end of the
-slice.
-
-When we try to compile the code in Listing 19-5, we’ll get an error:
-
-```
-error[E0499]: cannot borrow `*values` as mutable more than once at a time
- --> src/main.rs:9:31
- |
-2 | values: &mut [i32],
- | - let's call the lifetime of this reference `'1`
-...
-9 | (&mut values[..mid], &mut values[mid..])
- | --------------------------^^^^^^--------
- | | | |
- | | | second mutable borrow occurs here
- | | first mutable borrow occurs here
- | returning this value requires that `*values` is borrowed for `'1`
-```
-
-Rust’s borrow checker can’t understand that we’re borrowing different parts of
-the slice; it only knows that we’re borrowing from the same slice twice.
-Borrowing different parts of a slice is fundamentally okay because the two
-slices aren’t overlapping, but Rust isn’t smart enough to know this. When we
-know code is okay, but Rust doesn’t, it’s time to reach for unsafe code.
-
-Listing 19-6 shows how to use an `unsafe` block, a raw pointer, and some calls
-to unsafe functions to make the implementation of `split_at_mut` work.
-
-```
-use std::slice;
-
-fn split_at_mut(
- values: &mut [i32],
- mid: usize,
-) -> (&mut [i32], &mut [i32]) {
- 1 let len = values.len();
- 2 let ptr = values.as_mut_ptr();
-
- 3 assert!(mid <= len);
-
- 4 unsafe {
- (
- 5 slice::from_raw_parts_mut(ptr, mid),
- 6 slice::from_raw_parts_mut(ptr.add(mid), len - mid),
- )
- }
-}
-```
+The patterns in this `match` expression are the `None` and `Some(i)` to the
+left of each arrow.
-Listing 19-6: Using unsafe code in the implementation of the `split_at_mut`
-function
-
-Recall from “The Slice Type” on page XX that a slice is a pointer to some data
-and the length of the slice. We use the `len` method to get the length of a
-slice [1] and the `as_mut_ptr` method to access the raw pointer of a slice [2].
-In this case, because we have a mutable slice to `i32` values, `as_mut_ptr`
-returns a raw pointer with the type `*mut i32`, which we’ve stored in the
-variable `ptr`.
-
-We keep the assertion that the `mid` index is within the slice [3]. Then we get
-to the unsafe code [4]: the `slice::from_raw_parts_mut` function takes a raw
-pointer and a length, and it creates a slice. We use it to create a slice that
-starts from `ptr` and is `mid` items long [5]. Then we call the `add` method on
-`ptr` with `mid` as an argument to get a raw pointer that starts at `mid`, and
-we create a slice using that pointer and the remaining number of items after
-`mid` as the length [6].
-
-The function `slice::from_raw_parts_mut` is unsafe because it takes a raw
-pointer and must trust that this pointer is valid. The `add` method on raw
-pointers is also unsafe because it must trust that the offset location is also
-a valid pointer. Therefore, we had to put an `unsafe` block around our calls to
-`slice::from_raw_parts_mut` and `add` so we could call them. By looking at the
-code and by adding the assertion that `mid` must be less than or equal to
-`len`, we can tell that all the raw pointers used within the `unsafe` block
-will be valid pointers to data within the slice. This is an acceptable and
-appropriate use of `unsafe`.
-
-Note that we don’t need to mark the resultant `split_at_mut` function as
-`unsafe`, and we can call this function from safe Rust. We’ve created a safe
-abstraction to the unsafe code with an implementation of the function that uses
-`unsafe` code in a safe way, because it creates only valid pointers from the
-data this function has access to.
-
-In contrast, the use of `slice::from_raw_parts_mut` in Listing 19-7 would
-likely crash when the slice is used. This code takes an arbitrary memory
-location and creates a slice 10,000 items long.
-
-```
-use std::slice;
-
-let address = 0x01234usize;
-let r = address as *mut i32;
-
-let values: &[i32] = unsafe {
- slice::from_raw_parts_mut(r, 10000)
-};
-```
+One requirement for `match` expressions is that they need to be *exhaustive* in
+the sense that all possibilities for the value in the `match` expression must
+be accounted for. One way to ensure you’ve covered every possibility is to have
+a catchall pattern for the last arm: for example, a variable name matching any
+value can never fail and thus covers every remaining case.
-Listing 19-7: Creating a slice from an arbitrary memory location
+The particular pattern `_` will match anything, but it never binds to a
+variable, so it’s often used in the last match arm. The `_` pattern can be
+useful when you want to ignore any value not specified, for example. We’ll
+cover the `_` pattern in more detail in “Ignoring Values in a Pattern” on page
+XX.
-We don’t own the memory at this arbitrary location, and there is no guarantee
-that the slice this code creates contains valid `i32` values. Attempting to use
-`values` as though it’s a valid slice results in undefined behavior.
+### Conditional if let Expressions
-#### Using extern Functions to Call External Code
+In Chapter 6, we discussed how to use `if let` expressions mainly as a shorter
+way to write the equivalent of a `match` that only matches one case.
+Optionally, `if let` can have a corresponding `else` containing code to run if
+the pattern in the `if let` doesn’t match.
-Sometimes your Rust code might need to interact with code written in another
-language. For this, Rust has the keyword `extern` that facilitates the creation
-and use of a *Foreign Function Interface* *(FFI)*, which is a way for a
-programming language to define functions and enable a different (foreign)
-programming language to call those functions.
+Listing 18-1 shows that it’s also possible to mix and match `if let`, `else
+if`, and `else if let` expressions. Doing so gives us more flexibility than a
+`match` expression in which we can express only one value to compare with the
+patterns. Also, Rust doesn’t require that the conditions in a series of `if
+let`, `else if`, and `else if let` arms relate to each other.
-Listing 19-8 demonstrates how to set up an integration with the `abs` function
-from the C standard library. Functions declared within `extern` blocks are
-always unsafe to call from Rust code. The reason is that other languages don’t
-enforce Rust’s rules and guarantees, and Rust can’t check them, so
-responsibility falls on the programmer to ensure safety.
+The code in Listing 18-1 determines what color to make your background based on
+a series of checks for several conditions. For this example, we’ve created
+variables with hardcoded values that a real program might receive from user
+input.
Filename: src/main.rs
```
-extern "C" {
- fn abs(input: i32) -> i32;
-}
-
fn main() {
- unsafe {
- println!(
- "Absolute value of -3 according to C: {}",
- abs(-3)
+ let favorite_color: Option<&str> = None;
+ let is_tuesday = false;
+ let age: Result<u8, _> = "34".parse();
+
+ 1 if let Some(color) = favorite_color {
+ 2 println!(
+ "Using your favorite, {color}, as the background"
);
+ 3 } else if is_tuesday {
+ 4 println!("Tuesday is green day!");
+ 5 } else if let Ok(age) = age {
+ 6 if age > 30 {
+ 7 println!("Using purple as the background color");
+ } else {
+ 8 println!("Using orange as the background color");
+ }
+ 9 } else {
+ 10 println!("Using blue as the background color");
}
}
```
-Listing 19-8: Declaring and calling an `extern` function defined in another
-language
-
-Within the `extern "C"` block, we list the names and signatures of external
-functions from another language we want to call. The `"C"` part defines which
-*application binary interface* *(ABI)* the external function uses: the ABI
-defines how to call the function at the assembly level. The `"C"` ABI is the
-most common and follows the C programming language’s ABI.
-
-> ### Calling Rust Functions from Other Languages
->
-> We can also use `extern` to create an interface that allows other languages
-to call Rust functions. Instead of creating a whole `extern` block, we add the
-`extern` keyword and specify the ABI to use just before the `fn` keyword for
-the relevant function. We also need to add a `#[no_mangle]` annotation to tell
-the Rust compiler not to mangle the name of this function. *Mangling* is when a
-compiler changes the name we’ve given a function to a different name that
-contains more information for other parts of the compilation process to consume
-but is less human readable. Every programming language compiler mangles names
-slightly differently, so for a Rust function to be nameable by other languages,
-we must disable the Rust compiler’s name mangling.
->
-> In the following example, we make the `call_from_c` function accessible from
-C code, after it’s compiled to a shared library and linked from C:
->
-> ```
-> #[no_mangle]
-> pub extern "C" fn call_from_c() {
-> println!("Just called a Rust function from C!");
-> }
-> ```
->
-> This usage of `extern` does not require `unsafe`.
-
-### Accessing or Modifying a Mutable Static Variable
-
-In this book, we’ve not yet talked about global variables, which Rust does
-support but can be problematic with Rust’s ownership rules. If two threads are
-accessing the same mutable global variable, it can cause a data race.
-
-In Rust, global variables are called *static* variables. Listing 19-9 shows an
-example declaration and use of a static variable with a string slice as a value.
+Listing 18-1: Mixing `if let`, `else if`, `else if let`, and `else`
-Filename: src/main.rs
+If the user specifies a favorite color [1], that color is used as the
+background [2]. If no favorite color is specified and today is Tuesday [3], the
+background color is green [4]. Otherwise, if the user specifies their age as a
+string and we can parse it as a number successfully [5], the color is either
+purple [7] or orange [8] depending on the value of the number [6]. If none of
+these conditions apply [9], the background color is blue [10].
-```
-static HELLO_WORLD: &str = "Hello, world!";
+This conditional structure lets us support complex requirements. With the
+hardcoded values we have here, this example will print `Using purple as the
+background color`.
-fn main() {
- println!("value is: {HELLO_WORLD}");
-}
-```
+You can see that `if let` can also introduce shadowed variables in the same way
+that `match` arms can: the line `if let Ok(age) = age` [5] introduces a new
+shadowed `age` variable that contains the value inside the `Ok` variant. This
+means we need to place the `if age > 30` condition [6] within that block: we
+can’t combine these two conditions into `if let Ok(age) = age && age > 30`. The
+shadowed `age` we want to compare to 30 isn’t valid until the new scope starts
+with the curly bracket.
-Listing 19-9: Defining and using an immutable static variable
+The downside of using `if let` expressions is that the compiler doesn’t check
+for exhaustiveness, whereas with `match` expressions it does. If we omitted the
+last `else` block [9] and therefore missed handling some cases, the compiler
+would not alert us to the possible logic bug.
-Static variables are similar to constants, which we discussed in “Constants” on
-page XX. The names of static variables are in `SCREAMING_SNAKE_CASE` by
-convention. Static variables can only store references with the `'static`
-lifetime, which means the Rust compiler can figure out the lifetime and we
-aren’t required to annotate it explicitly. Accessing an immutable static
-variable is safe.
+### while let Conditional Loops
-A subtle difference between constants and immutable static variables is that
-values in a static variable have a fixed address in memory. Using the value
-will always access the same data. Constants, on the other hand, are allowed to
-duplicate their data whenever they’re used. Another difference is that static
-variables can be mutable. Accessing and modifying mutable static variables is
-*unsafe*. Listing 19-10 shows how to declare, access, and modify a mutable
-static variable named `COUNTER`.
+Similar in construction to `if let`, the `while let` conditional loop allows a
+`while` loop to run for as long as a pattern continues to match. In Listing
+18-2, we code a `while let` loop that uses a vector as a stack and prints the
+values in the vector in the opposite order in which they were pushed.
Filename: src/main.rs
```
-static mut COUNTER: u32 = 0;
+let mut stack = Vec::new();
-fn add_to_count(inc: u32) {
- unsafe {
- COUNTER += inc;
- }
-}
-
-fn main() {
- add_to_count(3);
+stack.push(1);
+stack.push(2);
+stack.push(3);
- unsafe {
- println!("COUNTER: {COUNTER}");
- }
+while let Some(top) = stack.pop() {
+ println!("{top}");
}
```
-Listing 19-10: Reading from or writing to a mutable static variable is unsafe.
+Listing 18-2: Using a `while let` loop to print values for as long as
+`stack.pop()` returns `Some`
-As with regular variables, we specify mutability using the `mut` keyword. Any
-code that reads or writes from `COUNTER` must be within an `unsafe` block. This
-code compiles and prints `COUNTER: 3` as we would expect because it’s single
-threaded. Having multiple threads access `COUNTER` would likely result in data
-races.
+This example prints `3`, `2`, and then `1`. The `pop` method takes the last
+element out of the vector and returns `Some(value)`. If the vector is empty,
+`pop` returns `None`. The `while` loop continues running the code in its block
+as long as `pop` returns `Some`. When `pop` returns `None`, the loop stops. We
+can use `while let` to pop every element off our stack.
-With mutable data that is globally accessible, it’s difficult to ensure there
-are no data races, which is why Rust considers mutable static variables to be
-unsafe. Where possible, it’s preferable to use the concurrency techniques and
-thread-safe smart pointers we discussed in Chapter 16 so the compiler checks
-that data access from different threads is done safely.
+### for Loops
-### Implementing an Unsafe Trait
+In a `for` loop, the value that directly follows the keyword `for` is a
+pattern. For example, in `for x in y`, the `x` is the pattern. Listing 18-3
+demonstrates how to use a pattern in a `for` loop to *destructure*, or break
+apart, a tuple as part of the `for` loop.
-We can use `unsafe` to implement an unsafe trait. A trait is unsafe when at
-least one of its methods has some invariant that the compiler can’t verify. We
-declare that a trait is `unsafe` by adding the `unsafe` keyword before `trait`
-and marking the implementation of the trait as `unsafe` too, as shown in
-Listing 19-11.
+Filename: src/main.rs
```
-unsafe trait Foo {
- // methods go here
-}
+let v = vec!['a', 'b', 'c'];
-unsafe impl Foo for i32 {
- // method implementations go here
+for (index, value) in v.iter().enumerate() {
+ println!("{value} is at index {index}");
}
```
-Listing 19-11: Defining and implementing an unsafe trait
-
-By using `unsafe impl`, we’re promising that we’ll uphold the invariants that
-the compiler can’t verify.
-
-As an example, recall the `Send` and `Sync` marker traits we discussed in
-“Extensible Concurrency with the Send and Sync Traits” on page XX: the compiler
-implements these traits automatically if our types are composed entirely of
-`Send` and `Sync` types. If we implement a type that contains a type that is
-not `Send` or `Sync`, such as raw pointers, and we want to mark that type as
-`Send` or `Sync`, we must use `unsafe`. Rust can’t verify that our type upholds
-the guarantees that it can be safely sent across threads or accessed from
-multiple threads; therefore, we need to do those checks manually and indicate
-as such with `unsafe`.
-
-### Accessing Fields of a Union
-
-The final action that works only with `unsafe` is accessing fields of a union.
-A `union` is similar to a `struct`, but only one declared field is used in a
-particular instance at one time. Unions are primarily used to interface with
-unions in C code. Accessing union fields is unsafe because Rust can’t guarantee
-the type of the data currently being stored in the union instance. You can
-learn more about unions in the Rust Reference at
-*https://doc.rust-lang.org/reference/items/unions.html**.*
+Listing 18-3: Using a pattern in a `for` loop to destructure a tuple
-### When to Use Unsafe Code
-
-Using `unsafe` to use one of the five superpowers just discussed isn’t wrong or
-even frowned upon, but it is trickier to get `unsafe` code correct because the
-compiler can’t help uphold memory safety. When you have a reason to use
-`unsafe` code, you can do so, and having the explicit `unsafe` annotation makes
-it easier to track down the source of problems when they occur.
-
-## Advanced Traits
-
-We first covered traits in “Traits: Defining Shared Behavior” on page XX, but
-we didn’t discuss the more advanced details. Now that you know more about Rust,
-we can get into the nitty-gritty.
-
-### Associated Types
-
-*Associated types* connect a type placeholder with a trait such that the trait
-method definitions can use these placeholder types in their signatures. The
-implementor of a trait will specify the concrete type to be used instead of the
-placeholder type for the particular implementation. That way, we can define a
-trait that uses some types without needing to know exactly what those types are
-until the trait is implemented.
-
-We’ve described most of the advanced features in this chapter as being rarely
-needed. Associated types are somewhere in the middle: they’re used more rarely
-than features explained in the rest of the book but more commonly than many of
-the other features discussed in this chapter.
-
-One example of a trait with an associated type is the `Iterator` trait that the
-standard library provides. The associated type is named `Item` and stands in
-for the type of the values the type implementing the `Iterator` trait is
-iterating over. The definition of the `Iterator` trait is as shown in Listing
-19-12.
+The code in Listing 18-3 will print the following:
```
-pub trait Iterator {
- type Item;
-
- fn next(&mut self) -> Option<Self::Item>;
-}
+a is at index 0
+b is at index 1
+c is at index 2
```
-Listing 19-12: The definition of the `Iterator` trait that has an associated
-type `Item`
+We adapt an iterator using the `enumerate` method so it produces a value and
+the index for that value, placed into a tuple. The first value produced is the
+tuple `(0, 'a')`. When this value is matched to the pattern `(index, value)`,
+`index` will be `0` and `value` will be `'a'`, printing the first line of the
+output.
-The type `Item` is a placeholder, and the `next` method’s definition shows that
-it will return values of type `Option<Self::Item>`. Implementors of the
-`Iterator` trait will specify the concrete type for `Item`, and the `next`
-method will return an `Option` containing a value of that concrete type.
+### let Statements
-Associated types might seem like a similar concept to generics, in that the
-latter allow us to define a function without specifying what types it can
-handle. To examine the difference between the two concepts, we’ll look at an
-implementation of the `Iterator` trait on a type named `Counter` that specifies
-the `Item` type is `u32`:
-
-Filename: src/lib.rs
+Prior to this chapter, we had only explicitly discussed using patterns with
+`match` and `if let`, but in fact, we’ve used patterns in other places as well,
+including in `let` statements. For example, consider this straightforward
+variable assignment with `let`:
```
-impl Iterator for Counter {
- type Item = u32;
-
- fn next(&mut self) -> Option<Self::Item> {
- --snip--
+let x = 5;
```
-This syntax seems comparable to that of generics. So why not just define the
-`Iterator` trait with generics, as shown in Listing 19-13?
+Every time you’ve used a `let` statement like this you’ve been using patterns,
+although you might not have realized it! More formally, a `let` statement looks
+like this:
```
-pub trait Iterator<T> {
- fn next(&mut self) -> Option<T>;
-}
+let PATTERN = EXPRESSION;
```
-Listing 19-13: A hypothetical definition of the `Iterator` trait using generics
-
-The difference is that when using generics, as in Listing 19-13, we must
-annotate the types in each implementation; because we can also implement
-`Iterator<``String``> for Counter` or any other type, we could have multiple
-implementations of `Iterator` for `Counter`. In other words, when a trait has a
-generic parameter, it can be implemented for a type multiple times, changing
-the concrete types of the generic type parameters each time. When we use the
-`next` method on `Counter`, we would have to provide type annotations to
-indicate which implementation of `Iterator` we want to use.
-
-With associated types, we don’t need to annotate types because we can’t
-implement a trait on a type multiple times. In Listing 19-12 with the
-definition that uses associated types, we can choose what the type of `Item`
-will be only once because there can be only one `impl Iterator for Counter`. We
-don’t have to specify that we want an iterator of `u32` values everywhere we
-call `next` on `Counter`.
-
-Associated types also become part of the trait’s contract: implementors of the
-trait must provide a type to stand in for the associated type placeholder.
-Associated types often have a name that describes how the type will be used,
-and documenting the associated type in the API documentation is a good practice.
-
-### Default Generic Type Parameters and Operator Overloading
-
-When we use generic type parameters, we can specify a default concrete type for
-the generic type. This eliminates the need for implementors of the trait to
-specify a concrete type if the default type works. You specify a default type
-when declaring a generic type with the `<`PlaceholderType`=`ConcreteType`>`
-syntax.
-
-A great example of a situation where this technique is useful is with *operator
-overloading*, in which you customize the behavior of an operator (such as `+`)
-in particular situations.
-
-Rust doesn’t allow you to create your own operators or overload arbitrary
-operators. But you can overload the operations and corresponding traits listed
-in `std::ops` by implementing the traits associated with the operator. For
-example, in Listing 19-14 we overload the `+` operator to add two `Point`
-instances together. We do this by implementing the `Add` trait on a `Point`
-struct.
+In statements like `let x = 5;` with a variable name in the PATTERN slot, the
+variable name is just a particularly simple form of a pattern. Rust compares
+the expression against the pattern and assigns any names it finds. So, in the
+`let x = 5;` example, `x` is a pattern that means “bind what matches here to
+the variable `x`.” Because the name `x` is the whole pattern, this pattern
+effectively means “bind everything to the variable `x`, whatever the value is.”
-Filename: src/main.rs
+To see the pattern-matching aspect of `let` more clearly, consider Listing
+18-4, which uses a pattern with `let` to destructure a tuple.
```
-use std::ops::Add;
-
-#[derive(Debug, Copy, Clone, PartialEq)]
-struct Point {
- x: i32,
- y: i32,
-}
-
-impl Add for Point {
- type Output = Point;
-
- fn add(self, other: Point) -> Point {
- Point {
- x: self.x + other.x,
- y: self.y + other.y,
- }
- }
-}
-
-fn main() {
- assert_eq!(
- Point { x: 1, y: 0 } + Point { x: 2, y: 3 },
- Point { x: 3, y: 3 }
- );
-}
+let (x, y, z) = (1, 2, 3);
```
-Listing 19-14: Implementing the `Add` trait to overload the `+` operator for
-`Point` instances
+Listing 18-4: Using a pattern to destructure a tuple and create three variables
+at once
-The `add` method adds the `x` values of two `Point` instances and the `y`
-values of two `Point` instances to create a new `Point`. The `Add` trait has an
-associated type named `Output` that determines the type returned from the `add`
-method.
+Here, we match a tuple against a pattern. Rust compares the value `(1, 2, 3)`
+to the pattern `(x, y, z)` and sees that the value matches the pattern, in that
+it sees that the number of elements is the same in both, so Rust binds `1` to
+`x`, `2` to `y`, and `3` to `z`. You can think of this tuple pattern as nesting
+three individual variable patterns inside it.
-The default generic type in this code is within the `Add` trait. Here is its
-definition:
+If the number of elements in the pattern doesn’t match the number of elements
+in the tuple, the overall type won’t match and we’ll get a compiler error. For
+example, Listing 18-5 shows an attempt to destructure a tuple with three
+elements into two variables, which won’t work.
```
-trait Add<Rhs=Self> {
- type Output;
-
- fn add(self, rhs: Rhs) -> Self::Output;
-}
+let (x, y) = (1, 2, 3);
```
-This code should look generally familiar: a trait with one method and an
-associated type. The new part is `Rhs=Self`: this syntax is called *default
-type parameters*. The `Rhs` generic type parameter (short for “right-hand
-side”) defines the type of the `rhs` parameter in the `add` method. If we don’t
-specify a concrete type for `Rhs` when we implement the `Add` trait, the type
-of `Rhs` will default to `Self`, which will be the type we’re implementing
-`Add` on.
+Listing 18-5: Incorrectly constructing a pattern whose variables don’t match
+the number of elements in the tuple
-When we implemented `Add` for `Point`, we used the default for `Rhs` because we
-wanted to add two `Point` instances. Let’s look at an example of implementing
-the `Add` trait where we want to customize the `Rhs` type rather than using the
-default.
-
-We have two structs, `Millimeters` and `Meters`, holding values in different
-units. This thin wrapping of an existing type in another struct is known as the
-*newtype pattern*, which we describe in more detail in “Using the Newtype
-Pattern to Implement External Traits on External Types” on page XX. We want to
-add values in millimeters to values in meters and have the implementation of
-`Add` do the conversion correctly. We can implement `Add` for `Millimeters`
-with `Meters` as the `Rhs`, as shown in Listing 19-15.
-
-Filename: src/lib.rs
+Attempting to compile this code results in this type error:
```
-use std::ops::Add;
-
-struct Millimeters(u32);
-struct Meters(u32);
-
-impl Add<Meters> for Millimeters {
- type Output = Millimeters;
-
- fn add(self, other: Meters) -> Millimeters {
- Millimeters(self.0 + (other.0 * 1000))
- }
-}
+error[E0308]: mismatched types
+ --> src/main.rs:2:9
+ |
+2 | let (x, y) = (1, 2, 3);
+ | ^^^^^^ --------- this expression has type `({integer}, {integer},
+{integer})`
+ | |
+ | expected a tuple with 3 elements, found one with 2 elements
+ |
+ = note: expected tuple `({integer}, {integer}, {integer})`
+ found tuple `(_, _)`
```
-Listing 19-15: Implementing the `Add` trait on `Millimeters` to add
-`Millimeters` and `Meters`
-
-To add `Millimeters` and `Meters`, we specify `impl Add<Meters>` to set the
-value of the `Rhs` type parameter instead of using the default of `Self`.
-
-You’ll use default type parameters in two main ways:
-
-1. To extend a type without breaking existing code
-1. To allow customization in specific cases most users won’t need
+To fix the error, we could ignore one or more of the values in the tuple using
+`_` or `..`, as you’ll see in “Ignoring Values in a Pattern” on page XX. If the
+problem is that we have too many variables in the pattern, the solution is to
+make the types match by removing variables so the number of variables equals
+the number of elements in the tuple.
-The standard library’s `Add` trait is an example of the second purpose:
-usually, you’ll add two like types, but the `Add` trait provides the ability to
-customize beyond that. Using a default type parameter in the `Add` trait
-definition means you don’t have to specify the extra parameter most of the
-time. In other words, a bit of implementation boilerplate isn’t needed, making
-it easier to use the trait.
+### Function Parameters
-The first purpose is similar to the second but in reverse: if you want to add a
-type parameter to an existing trait, you can give it a default to allow
-extension of the functionality of the trait without breaking the existing
-implementation code.
-
-### Disambiguating Between Methods with the Same Name
-
-Nothing in Rust prevents a trait from having a method with the same name as
-another trait’s method, nor does Rust prevent you from implementing both traits
-on one type. It’s also possible to implement a method directly on the type with
-the same name as methods from traits.
-
-When calling methods with the same name, you’ll need to tell Rust which one you
-want to use. Consider the code in Listing 19-16 where we’ve defined two traits,
-`Pilot` and `Wizard`, that both have a method called `fly`. We then implement
-both traits on a type `Human` that already has a method named `fly` implemented
-on it. Each `fly` method does something different.
-
-Filename: src/main.rs
+Function parameters can also be patterns. The code in Listing 18-6, which
+declares a function named `foo` that takes one parameter named `x` of type
+`i32`, should by now look familiar.
```
-trait Pilot {
- fn fly(&self);
-}
-
-trait Wizard {
- fn fly(&self);
-}
-
-struct Human;
-
-impl Pilot for Human {
- fn fly(&self) {
- println!("This is your captain speaking.");
- }
-}
-
-impl Wizard for Human {
- fn fly(&self) {
- println!("Up!");
- }
-}
-
-impl Human {
- fn fly(&self) {
- println!("*waving arms furiously*");
- }
+fn foo(x: i32) {
+ // code goes here
}
```
-Listing 19-16: Two traits are defined to have a `fly` method and are
-implemented on the `Human` type, and a `fly` method is implemented on `Human`
-directly.
+Listing 18-6: A function signature using patterns in the parameters
-When we call `fly` on an instance of `Human`, the compiler defaults to calling
-the method that is directly implemented on the type, as shown in Listing 19-17.
+The `x` part is a pattern! As we did with `let`, we could match a tuple in a
+function’s arguments to the pattern. Listing 18-7 splits the values in a tuple
+as we pass it to a function.
Filename: src/main.rs
```
-fn main() {
- let person = Human;
- person.fly();
+fn print_coordinates(&(x, y): &(i32, i32)) {
+ println!("Current location: ({x}, {y})");
}
-```
-
-Listing 19-17: Calling `fly` on an instance of `Human`
-Running this code will print `*waving arms furiously*`, showing that Rust
-called the `fly` method implemented on `Human` directly.
-
-To call the `fly` methods from either the `Pilot` trait or the `Wizard` trait,
-we need to use more explicit syntax to specify which `fly` method we mean.
-Listing 19-18 demonstrates this syntax.
-
-Filename: src/main.rs
-
-```
fn main() {
- let person = Human;
- Pilot::fly(&person);
- Wizard::fly(&person);
- person.fly();
+ let point = (3, 5);
+ print_coordinates(&point);
}
```
-Listing 19-18: Specifying which trait’s `fly` method we want to call
+Listing 18-7: A function with parameters that destructure a tuple
-Specifying the trait name before the method name clarifies to Rust which
-implementation of `fly` we want to call. We could also write
-`Human::fly(&person)`, which is equivalent to the `person.fly()` that we used
-in Listing 19-18, but this is a bit longer to write if we don’t need to
-disambiguate.
+This code prints `Current location: (3, 5)`. The values `&(3, 5)` match the
+pattern `&(x, y)`, so `x` is the value `3` and `y` is the value `5`.
-Running this code prints the following:
+We can also use patterns in closure parameter lists in the same way as in
+function parameter lists because closures are similar to functions, as
+discussed in Chapter 13.
-```
-This is your captain speaking.
-Up!
-*waving arms furiously*
-```
+At this point, you’ve seen several ways to use patterns, but patterns don’t
+work the same in every place we can use them. In some places, the patterns must
+be irrefutable; in other circumstances, they can be refutable. We’ll discuss
+these two concepts next.
-Because the `fly` method takes a `self` parameter, if we had two *types* that
-both implement one *trait*, Rust could figure out which implementation of a
-trait to use based on the type of `self`.
+## Refutability: Whether a Pattern Might Fail to Match
-However, associated functions that are not methods don’t have a `self`
-parameter. When there are multiple types or traits that define non-method
-functions with the same function name, Rust doesn’t always know which type you
-mean unless you use fully qualified syntax. For example, in Listing 19-19 we
-create a trait for an animal shelter that wants to name all baby dogs Spot. We
-make an `Animal` trait with an associated non-method function `baby_name`. The
-`Animal` trait is implemented for the struct `Dog`, on which we also provide an
-associated non-method function `baby_name` directly.
+Patterns come in two forms: refutable and irrefutable. Patterns that will match
+for any possible value passed are *irrefutable*. An example would be `x` in the
+statement `let x = 5;` because `x` matches anything and therefore cannot fail
+to match. Patterns that can fail to match for some possible value are
+*refutable*. An example would be `Some(x)` in the expression `if let Some(x) =
+a_value` because if the value in the `a_value` variable is `None` rather than
+`Some`, the `Some(x)` pattern will not match.
-Filename: src/main.rs
+Function parameters, `let` statements, and `for` loops can only accept
+irrefutable patterns because the program cannot do anything meaningful when
+values don’t match. The `if let` and `while let` expressions accept refutable
+and irrefutable patterns, but the compiler warns against irrefutable patterns
+because, by definition, they’re intended to handle possible failure: the
+functionality of a conditional is in its ability to perform differently
+depending on success or failure.
-```
-trait Animal {
- fn baby_name() -> String;
-}
-
-struct Dog;
-
-impl Dog {
- fn baby_name() -> String {
- String::from("Spot")
- }
-}
+In general, you shouldn’t have to worry about the distinction between refutable
+and irrefutable patterns; however, you do need to be familiar with the concept
+of refutability so you can respond when you see it in an error message. In
+those cases, you’ll need to change either the pattern or the construct you’re
+using the pattern with, depending on the intended behavior of the code.
-impl Animal for Dog {
- fn baby_name() -> String {
- String::from("puppy")
- }
-}
+Let’s look at an example of what happens when we try to use a refutable pattern
+where Rust requires an irrefutable pattern and vice versa. Listing 18-8 shows a
+`let` statement, but for the pattern, we’ve specified `Some(x)`, a refutable
+pattern. As you might expect, this code will not compile.
-fn main() {
- println!("A baby dog is called a {}", Dog::baby_name());
-}
```
-
-Listing 19-19: A trait with an associated function and a type with an
-associated function of the same name that also implements the trait
-
-We implement the code for naming all puppies Spot in the `baby_name` associated
-function that is defined on `Dog`. The `Dog` type also implements the trait
-`Animal`, which describes characteristics that all animals have. Baby dogs are
-called puppies, and that is expressed in the implementation of the `Animal`
-trait on `Dog` in the `baby_name` function associated with the `Animal` trait.
-
-In `main`, we call the `Dog::baby_name` function, which calls the associated
-function defined on `Dog` directly. This code prints the following:
-
-```
-A baby dog is called a Spot
+let Some(x) = some_option_value;
```
-This output isn’t what we wanted. We want to call the `baby_name` function that
-is part of the `Animal` trait that we implemented on `Dog` so the code prints
-`A baby dog is called a puppy`. The technique of specifying the trait name that
-we used in Listing 19-18 doesn’t help here; if we change `main` to the code in
-Listing 19-20, we’ll get a compilation error.
+Listing 18-8: Attempting to use a refutable pattern with `let`
-Filename: src/main.rs
+If `some_option_value` were a `None` value, it would fail to match the pattern
+`Some(x)`, meaning the pattern is refutable. However, the `let` statement can
+only accept an irrefutable pattern because there is nothing valid the code can
+do with a `None` value. At compile time, Rust will complain that we’ve tried to
+use a refutable pattern where an irrefutable pattern is required:
```
-fn main() {
- println!("A baby dog is called a {}", Animal::baby_name());
-}
+error[E0005]: refutable pattern in local binding: `None` not covered
+ --> src/main.rs:3:9
+ |
+3 | let Some(x) = some_option_value;
+ | ^^^^^^^ pattern `None` not covered
+ |
+ = note: `let` bindings require an "irrefutable pattern", like a `struct` or
+an `enum` with only one variant
+ = note: for more information, visit
+https://doc.rust-lang.org/book/ch18-02-refutability.html
+ = note: the matched value is of type `Option<i32>`
+help: you might want to use `if let` to ignore the variant that isn't matched
+ |
+3 | let x = if let Some(x) = some_option_value { x } else { todo!() };
+ | ++++++++++ ++++++++++++++++++++++
```
-Listing 19-20: Attempting to call the `baby_name` function from the `Animal`
-trait, but Rust doesn’t know which implementation to use
+Because we didn’t cover (and couldn’t cover!) every valid value with the
+pattern `Some(x)`, Rust rightfully produces a compiler error.
-Because `Animal::baby_name` doesn’t have a `self` parameter, and there could be
-other types that implement the `Animal` trait, Rust can’t figure out which
-implementation of `Animal::baby_name` we want. We’ll get this compiler error:
+If we have a refutable pattern where an irrefutable pattern is needed, we can
+fix it by changing the code that uses the pattern: instead of using `let`, we
+can use `if let`. Then, if the pattern doesn’t match, the code will just skip
+the code in the curly brackets, giving it a way to continue validly. Listing
+18-9 shows how to fix the code in Listing 18-8.
```
-error[E0283]: type annotations needed
- --> src/main.rs:20:43
- |
-20 | println!("A baby dog is called a {}", Animal::baby_name());
- | ^^^^^^^^^^^^^^^^^ cannot infer
-type
- |
- = note: cannot satisfy `_: Animal`
-```
-
-To disambiguate and tell Rust that we want to use the implementation of
-`Animal` for `Dog` as opposed to the implementation of `Animal` for some other
-type, we need to use fully qualified syntax. Listing 19-21 demonstrates how to
-use fully qualified syntax.
-
-Filename: src/main.rs
-
-```
-fn main() {
- println!(
- "A baby dog is called a {}",
- <Dog as Animal>::baby_name()
- );
+if let Some(x) = some_option_value {
+ println!("{x}");
}
```
-Listing 19-21: Using fully qualified syntax to specify that we want to call the
-`baby_name` function from the `Animal` trait as implemented on `Dog`
+Listing 18-9: Using `if let` and a block with refutable patterns instead of
+`let`
-We’re providing Rust with a type annotation within the angle brackets, which
-indicates we want to call the `baby_name` method from the `Animal` trait as
-implemented on `Dog` by saying that we want to treat the `Dog` type as an
-`Animal` for this function call. This code will now print what we want:
+We’ve given the code an out! This code is perfectly valid, although it means we
+cannot use an irrefutable pattern without receiving an error. If we give `if
+let` a pattern that will always match, such as `x`, as shown in Listing 18-10,
+the compiler will give a warning.
```
-A baby dog is called a puppy
+if let x = 5 {
+ println!("{x}");
+};
```
-In general, fully qualified syntax is defined as follows:
+Listing 18-10: Attempting to use an irrefutable pattern with `if let`
+
+Rust complains that it doesn’t make sense to use `if let` with an irrefutable
+pattern:
```
-<Type as Trait>::function(receiver_if_method, next_arg, ...);
+warning: irrefutable `if let` pattern
+ --> src/main.rs:2:8
+ |
+2 | if let x = 5 {
+ | ^^^^^^^^^
+ |
+ = note: `#[warn(irrefutable_let_patterns)]` on by default
+ = note: this pattern will always match, so the `if let` is
+useless
+ = help: consider replacing the `if let` with a `let`
```
-For associated functions that aren’t methods, there would not be a `receiver`:
-there would only be the list of other arguments. You could use fully qualified
-syntax everywhere that you call functions or methods. However, you’re allowed
-to omit any part of this syntax that Rust can figure out from other information
-in the program. You only need to use this more verbose syntax in cases where
-there are multiple implementations that use the same name and Rust needs help
-to identify which implementation you want to call.
+For this reason, match arms must use refutable patterns, except for the last
+arm, which should match any remaining values with an irrefutable pattern. Rust
+allows us to use an irrefutable pattern in a `match` with only one arm, but
+this syntax isn’t particularly useful and could be replaced with a simpler
+`let` statement.
-### Using Supertraits
+Now that you know where to use patterns and the difference between refutable
+and irrefutable patterns, let’s cover all the syntax we can use to create
+patterns.
-Sometimes you might write a trait definition that depends on another trait: for
-a type to implement the first trait, you want to require that type to also
-implement the second trait. You would do this so that your trait definition can
-make use of the associated items of the second trait. The trait your trait
-definition is relying on is called a *supertrait* of your trait.
+## Pattern Syntax
-For example, let’s say we want to make an `OutlinePrint` trait with an
-`outline_print` method that will print a given value formatted so that it’s
-framed in asterisks. That is, given a `Point` struct that implements the
-standard library trait `Display` to result in `(x, y)`, when we call
-`outline_print` on a `Point` instance that has `1` for `x` and `3` for `y`, it
-should print the following:
+In this section, we gather all the syntax that is valid in patterns and discuss
+why and when you might want to use each one.
-```
-**********
-* *
-* (1, 3) *
-* *
-**********
-```
+### Matching Literals
-In the implementation of the `outline_print` method, we want to use the
-`Display` trait’s functionality. Therefore, we need to specify that the
-`OutlinePrint` trait will work only for types that also implement `Display` and
-provide the functionality that `OutlinePrint` needs. We can do that in the
-trait definition by specifying `OutlinePrint: Display`. This technique is
-similar to adding a trait bound to the trait. Listing 19-22 shows an
-implementation of the `OutlinePrint` trait.
+As you saw in Chapter 6, you can match patterns against literals directly. The
+following code gives some examples:
Filename: src/main.rs
```
-use std::fmt;
+let x = 1;
-trait OutlinePrint: fmt::Display {
- fn outline_print(&self) {
- let output = self.to_string();
- let len = output.len();
- println!("{}", "*".repeat(len + 4));
- println!("*{}*", " ".repeat(len + 2));
- println!("* {} *", output);
- println!("*{}*", " ".repeat(len + 2));
- println!("{}", "*".repeat(len + 4));
- }
+match x {
+ 1 => println!("one"),
+ 2 => println!("two"),
+ 3 => println!("three"),
+ _ => println!("anything"),
}
```
-Listing 19-22: Implementing the `OutlinePrint` trait that requires the
-functionality from `Display`
+This code prints `one` because the value in `x` is `1`. This syntax is useful
+when you want your code to take an action if it gets a particular concrete
+value.
-Because we’ve specified that `OutlinePrint` requires the `Display` trait, we
-can use the `to_string` function that is automatically implemented for any type
-that implements `Display`. If we tried to use `to_string` without adding a
-colon and specifying the `Display` trait after the trait name, we’d get an
-error saying that no method named `to_string` was found for the type `&Self` in
-the current scope.
+### Matching Named Variables
-Let’s see what happens when we try to implement `OutlinePrint` on a type that
-doesn’t implement `Display`, such as the `Point` struct:
+Named variables are irrefutable patterns that match any value, and we’ve used
+them many times in this book. However, there is a complication when you use
+named variables in `match` expressions. Because `match` starts a new scope,
+variables declared as part of a pattern inside the `match` expression will
+shadow those with the same name outside the `match` construct, as is the case
+with all variables. In Listing 18-11, we declare a variable named `x` with the
+value `Some(5)` and a variable `y` with the value `10`. We then create a
+`match` expression on the value `x`. Look at the patterns in the match arms and
+`println!` at the end, and try to figure out what the code will print before
+running this code or reading further.
Filename: src/main.rs
```
-struct Point {
- x: i32,
- y: i32,
-}
-
-impl OutlinePrint for Point {}
-```
+fn main() {
+ 1 let x = Some(5);
+ 2 let y = 10;
-We get an error saying that `Display` is required but not implemented:
+ match x {
+ 3 Some(50) => println!("Got 50"),
+ 4 Some(y) => println!("Matched, y = {y}"),
+ 5 _ => println!("Default case, x = {:?}", x),
+ }
-```
-error[E0277]: `Point` doesn't implement `std::fmt::Display`
- --> src/main.rs:20:6
- |
-20 | impl OutlinePrint for Point {}
- | ^^^^^^^^^^^^ `Point` cannot be formatted with the default formatter
- |
- = help: the trait `std::fmt::Display` is not implemented for `Point`
- = note: in format strings you may be able to use `{:?}` (or {:#?} for
-pretty-print) instead
-note: required by a bound in `OutlinePrint`
- --> src/main.rs:3:21
- |
-3 | trait OutlinePrint: fmt::Display {
- | ^^^^^^^^^^^^ required by this bound in `OutlinePrint`
+ 6 println!("at the end: x = {:?}, y = {y}", x);
+}
```
-To fix this, we implement `Display` on `Point` and satisfy the constraint that
-`OutlinePrint` requires, like so:
+Listing 18-11: A `match` expression with an arm that introduces a shadowed
+variable `y`
-Filename: src/main.rs
+Let’s walk through what happens when the `match` expression runs. The pattern
+in the first match arm [3] doesn’t match the defined value of `x` [1], so the
+code continues.
-```
-use std::fmt;
+The pattern in the second match arm [4] introduces a new variable named `y`
+that will match any value inside a `Some` value. Because we’re in a new scope
+inside the `match` expression, this is a new `y` variable, not the `y` we
+declared at the beginning with the value `10` [2]. This new `y` binding will
+match any value inside a `Some`, which is what we have in `x`. Therefore, this
+new `y` binds to the inner value of the `Some` in `x`. That value is `5`, so
+the expression for that arm executes and prints `Matched, y = 5`.
-impl fmt::Display for Point {
- fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
- write!(f, "({}, {})", self.x, self.y)
- }
-}
-```
+If `x` had been a `None` value instead of `Some(5)`, the patterns in the first
+two arms wouldn’t have matched, so the value would have matched to the
+underscore [5]. We didn’t introduce the `x` variable in the pattern of the
+underscore arm, so the `x` in the expression is still the outer `x` that hasn’t
+been shadowed. In this hypothetical case, the `match` would print `Default
+case, x = None`.
-Then, implementing the `OutlinePrint` trait on `Point` will compile
-successfully, and we can call `outline_print` on a `Point` instance to display
-it within an outline of asterisks.
+When the `match` expression is done, its scope ends, and so does the scope of
+the inner `y`. The last `println!` [6] produces `at the end: x = Some(5), y =
+10`.
-### Using the Newtype Pattern to Implement External Traits
+To create a `match` expression that compares the values of the outer `x` and
+`y`, rather than introducing a shadowed variable, we would need to use a match
+guard conditional instead. We’ll talk about match guards in “Extra Conditionals
+with Match Guards” on page XX.
-In “Implementing a Trait on a Type” on page XX, we mentioned the orphan rule
-that states we’re only allowed to implement a trait on a type if either the
-trait or the type, or both, are local to our crate. It’s possible to get around
-this restriction using the *newtype pattern*, which involves creating a new
-type in a tuple struct. (We covered tuple structs in “Using Tuple Structs
-Without Named Fields to Create Different Types” on page XX.) The tuple struct
-will have one field and be a thin wrapper around the type for which we want to
-implement a trait. Then the wrapper type is local to our crate, and we can
-implement the trait on the wrapper. *Newtype* is a term that originates from
-the Haskell programming language. There is no runtime performance penalty for
-using this pattern, and the wrapper type is elided at compile time.
+### Multiple Patterns
-As an example, let’s say we want to implement `Display` on `Vec<T>`, which the
-orphan rule prevents us from doing directly because the `Display` trait and the
-`Vec<T>` type are defined outside our crate. We can make a `Wrapper` struct
-that holds an instance of `Vec<T>`; then we can implement `Display` on
-`Wrapper` and use the `Vec<T>` value, as shown in Listing 19-23.
+In `match` expressions, you can match multiple patterns using the `|` syntax,
+which is the pattern *or* operator. For example, in the following code we match
+the value of `x` against the match arms, the first of which has an *or* option,
+meaning if the value of `x` matches either of the values in that arm, that
+arm’s code will run:
Filename: src/main.rs
```
-use std::fmt;
-
-struct Wrapper(Vec<String>);
-
-impl fmt::Display for Wrapper {
- fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
- write!(f, "[{}]", self.0.join(", "))
- }
-}
+let x = 1;
-fn main() {
- let w = Wrapper(vec![
- String::from("hello"),
- String::from("world"),
- ]);
- println!("w = {w}");
+match x {
+ 1 | 2 => println!("one or two"),
+ 3 => println!("three"),
+ _ => println!("anything"),
}
```
-Listing 19-23: Creating a `Wrapper` type around `Vec<String>` to implement
-`Display`
-
-The implementation of `Display` uses `self.0` to access the inner `Vec<T>`
-because `Wrapper` is a tuple struct and `Vec<T>` is the item at index 0 in the
-tuple. Then we can use the functionality of the `Display` type on `Wrapper`.
-
-The downside of using this technique is that `Wrapper` is a new type, so it
-doesn’t have the methods of the value it’s holding. We would have to implement
-all the methods of `Vec<T>` directly on `Wrapper` such that the methods
-delegate to `self.0`, which would allow us to treat `Wrapper` exactly like a
-`Vec<T>`. If we wanted the new type to have every method the inner type has,
-implementing the `Deref` trait on the `Wrapper` to return the inner type would
-be a solution (we discussed implementing the `Deref` trait in “Treating Smart
-Pointers Like Regular References with Deref” on page XX). If we didn’t want the
-`Wrapper` type to have all the methods of the inner type—for example, to
-restrict the `Wrapper` type’s behavior—we would have to implement just the
-methods we do want manually.
-
-This newtype pattern is also useful even when traits are not involved. Let’s
-switch focus and look at some advanced ways to interact with Rust’s type system.
-
-## Advanced Types
-
-The Rust type system has some features that we’ve so far mentioned but haven’t
-yet discussed. We’ll start by discussing newtypes in general as we examine why
-newtypes are useful as types. Then we’ll move on to type aliases, a feature
-similar to newtypes but with slightly different semantics. We’ll also discuss
-the `!` type and dynamically sized types.
+This code prints `one or two`.
-### Using the Newtype Pattern for Type Safety and Abstraction
+### Matching Ranges of Values with ..=
-> Note: This section assumes you’ve read the earlier section “Using the Newtype
-Pattern to Implement External Traits” on page XX.
+The `..=` syntax allows us to match to an inclusive range of values. In the
+following code, when a pattern matches any of the values within the given
+range, that arm will execute:
-The newtype pattern is also useful for tasks beyond those we’ve discussed so
-far, including statically enforcing that values are never confused and
-indicating the units of a value. You saw an example of using newtypes to
-indicate units in Listing 19-15: recall that the `Millimeters` and `Meters`
-structs wrapped `u32` values in a newtype. If we wrote a function with a
-parameter of type `Millimeters`, we wouldn’t be able to compile a program that
-accidentally tried to call that function with a value of type `Meters` or a
-plain `u32`.
-
-We can also use the newtype pattern to abstract away some implementation
-details of a type: the new type can expose a public API that is different from
-the API of the private inner type.
-
-Newtypes can also hide internal implementation. For example, we could provide a
-`People` type to wrap a `HashMap<i32, String>` that stores a person’s ID
-associated with their name. Code using `People` would only interact with the
-public API we provide, such as a method to add a name string to the `People`
-collection; that code wouldn’t need to know that we assign an `i32` ID to names
-internally. The newtype pattern is a lightweight way to achieve encapsulation
-to hide implementation details, which we discussed in “Encapsulation That Hides
-Implementation Details” on page XX.
-
-### Creating Type Synonyms with Type Aliases
-
-Rust provides the ability to declare a *type alias* to give an existing type
-another name. For this we use the `type` keyword. For example, we can create
-the alias `Kilometers` to `i32` like so:
-
-```
-type Kilometers = i32;
-```
-
-Now the alias `Kilometers` is a *synonym* for `i32`; unlike the `Millimeters`
-and `Meters` types we created in Listing 19-15, `Kilometers` is not a separate,
-new type. Values that have the type `Kilometers` will be treated the same as
-values of type `i32`:
+Filename: src/main.rs
```
-type Kilometers = i32;
+let x = 5;
-let x: i32 = 5;
-let y: Kilometers = 5;
-
-println!("x + y = {}", x + y);
+match x {
+ 1..=5 => println!("one through five"),
+ _ => println!("something else"),
+}
```
-Because `Kilometers` and `i32` are the same type, we can add values of both
-types and we can pass `Kilometers` values to functions that take `i32`
-parameters. However, using this method, we don’t get the type-checking benefits
-that we get from the newtype pattern discussed earlier. In other words, if we
-mix up `Kilometers` and `i32` values somewhere, the compiler will not give us
-an error.
+If `x` is `1`, `2`, `3`, `4`, or `5`, the first arm will match. This syntax is
+more convenient for multiple match values than using the `|` operator to
+express the same idea; if we were to use `|`, we would have to specify `1 | 2 |
+3 | 4 | 5`. Specifying a range is much shorter, especially if we want to match,
+say, any number between 1 and 1,000!
-The main use case for type synonyms is to reduce repetition. For example, we
-might have a lengthy type like this:
+The compiler checks that the range isn’t empty at compile time, and because the
+only types for which Rust can tell if a range is empty or not are `char` and
+numeric values, ranges are only allowed with numeric or `char` values.
-```
-Box<dyn Fn() + Send + 'static>
-```
+Here is an example using ranges of `char` values:
-Writing this lengthy type in function signatures and as type annotations all
-over the code can be tiresome and error prone. Imagine having a project full of
-code like that in Listing 19-24.
+Filename: src/main.rs
```
-let f: Box<dyn Fn() + Send + 'static> = Box::new(|| {
- println!("hi");
-});
+let x = 'c';
-fn takes_long_type(f: Box<dyn Fn() + Send + 'static>) {
- --snip--
+match x {
+ 'a'..='j' => println!("early ASCII letter"),
+ 'k'..='z' => println!("late ASCII letter"),
+ _ => println!("something else"),
}
-
-fn returns_long_type() -> Box<dyn Fn() + Send + 'static> {
- --snip--
-}
-```
-
-Listing 19-24: Using a long type in many places
-
-A type alias makes this code more manageable by reducing the repetition. In
-Listing 19-25, we’ve introduced an alias named `Thunk` for the verbose type and
-can replace all uses of the type with the shorter alias `Thunk`.
-
```
-type Thunk = Box<dyn Fn() + Send + 'static>;
-let f: Thunk = Box::new(|| println!("hi"));
+Rust can tell that `'c'` is within the first pattern’s range and prints `early
+ASCII letter`.
-fn takes_long_type(f: Thunk) {
- --snip--
-}
+### Destructuring to Break Apart Values
-fn returns_long_type() -> Thunk {
- --snip--
-}
-```
+We can also use patterns to destructure structs, enums, and tuples to use
+different parts of these values. Let’s walk through each value.
-Listing 19-25: Introducing a type alias `Thunk` to reduce repetition
+#### Destructuring Structs
-This code is much easier to read and write! Choosing a meaningful name for a
-type alias can help communicate your intent as well (*thunk* is a word for code
-to be evaluated at a later time, so it’s an appropriate name for a closure that
-gets stored).
+Listing 18-12 shows a `Point` struct with two fields, `x` and `y`, that we can
+break apart using a pattern with a `let` statement.
-Type aliases are also commonly used with the `Result<T, E>` type for reducing
-repetition. Consider the `std::io` module in the standard library. I/O
-operations often return a `Result<T, E>` to handle situations when operations
-fail to work. This library has a `std::io::Error` struct that represents all
-possible I/O errors. Many of the functions in `std::io` will be returning
-`Result<T, E>` where the `E` is `std::io::Error`, such as these functions in
-the `Write` trait:
+Filename: src/main.rs
```
-use std::fmt;
-use std::io::Error;
+struct Point {
+ x: i32,
+ y: i32,
+}
-pub trait Write {
- fn write(&mut self, buf: &[u8]) -> Result<usize, Error>;
- fn flush(&mut self) -> Result<(), Error>;
+fn main() {
+ let p = Point { x: 0, y: 7 };
- fn write_all(&mut self, buf: &[u8]) -> Result<(), Error>;
- fn write_fmt(
- &mut self,
- fmt: fmt::Arguments,
- ) -> Result<(), Error>;
+ let Point { x: a, y: b } = p;
+ assert_eq!(0, a);
+ assert_eq!(7, b);
}
```
-The `Result<..., Error>` is repeated a lot. As such, `std::io` has this type
-alias declaration:
+Listing 18-12: Destructuring a struct’s fields into separate variables
-```
-type Result<T> = std::result::Result<T, std::io::Error>;
-```
+This code creates the variables `a` and `b` that match the values of the `x`
+and `y` fields of the `p` struct. This example shows that the names of the
+variables in the pattern don’t have to match the field names of the struct.
+However, it’s common to match the variable names to the field names to make it
+easier to remember which variables came from which fields. Because of this
+common usage, and because writing `let Point { x: x, y: y } = p;` contains a
+lot of duplication, Rust has a shorthand for patterns that match struct fields:
+you only need to list the name of the struct field, and the variables created
+from the pattern will have the same names. Listing 18-13 behaves in the same
+way as the code in Listing 18-12, but the variables created in the `let`
+pattern are `x` and `y` instead of `a` and `b`.
-Because this declaration is in the `std::io` module, we can use the fully
-qualified alias `std::io::Result<T>`; that is, a `Result<T, E>` with the `E`
-filled in as `std::io::Error`. The `Write` trait function signatures end up
-looking like this:
+Filename: src/main.rs
```
-pub trait Write {
- fn write(&mut self, buf: &[u8]) -> Result<usize>;
- fn flush(&mut self) -> Result<()>;
-
- fn write_all(&mut self, buf: &[u8]) -> Result<()>;
- fn write_fmt(&mut self, fmt: fmt::Arguments) -> Result<()>;
+struct Point {
+ x: i32,
+ y: i32,
}
-```
-The type alias helps in two ways: it makes code easier to write *and* it gives
-us a consistent interface across all of `std::io`. Because it’s an alias, it’s
-just another `Result<T, E>`, which means we can use any methods that work on
-`Result<T, E>` with it, as well as special syntax like the `?` operator.
-
-### The Never Type That Never Returns
-
-Rust has a special type named `!` that’s known in type theory lingo as the
-*empty type* because it has no values. We prefer to call it the *never type*
-because it stands in the place of the return type when a function will never
-return. Here is an example:
+fn main() {
+ let p = Point { x: 0, y: 7 };
-```
-fn bar() -> ! {
- --snip--
+ let Point { x, y } = p;
+ assert_eq!(0, x);
+ assert_eq!(7, y);
}
```
-This code is read as “the function `bar` returns never.” Functions that return
-never are called *diverging functions*. We can’t create values of the type `!`,
-so `bar` can never possibly return.
+Listing 18-13: Destructuring struct fields using struct field shorthand
-But what use is a type you can never create values for? Recall the code from
-Listing 2-5, part of the number-guessing game; we’ve reproduced a bit of it
-here in Listing 19-26.
+This code creates the variables `x` and `y` that match the `x` and `y` fields
+of the `p` variable. The outcome is that the variables `x` and `y` contain the
+values from the `p` struct.
-```
-let guess: u32 = match guess.trim().parse() {
- Ok(num) => num,
- Err(_) => continue,
-};
-```
+We can also destructure with literal values as part of the struct pattern
+rather than creating variables for all the fields. Doing so allows us to test
+some of the fields for particular values while creating variables to
+destructure the other fields.
-Listing 19-26: A `match` with an arm that ends in `continue`
+In Listing 18-14, we have a `match` expression that separates `Point` values
+into three cases: points that lie directly on the `x` axis (which is true when
+`y = 0`), on the `y` axis (`x = 0`), or on neither axis.
-At the time, we skipped over some details in this code. In “The match Control
-Flow Construct” on page XX, we discussed that `match` arms must all return the
-same type. So, for example, the following code doesn’t work:
+Filename: src/main.rs
```
-let guess = match guess.trim().parse() {
- Ok(_) => 5,
- Err(_) => "hello",
-};
-```
-
-The type of `guess` in this code would have to be an integer *and* a string,
-and Rust requires that `guess` have only one type. So what does `continue`
-return? How were we allowed to return a `u32` from one arm and have another arm
-that ends with `continue` in Listing 19-26?
-
-As you might have guessed, `continue` has a `!` value. That is, when Rust
-computes the type of `guess`, it looks at both match arms, the former with a
-value of `u32` and the latter with a `!` value. Because `!` can never have a
-value, Rust decides that the type of `guess` is `u32`.
-
-The formal way of describing this behavior is that expressions of type `!` can
-be coerced into any other type. We’re allowed to end this `match` arm with
-`continue` because `continue` doesn’t return a value; instead, it moves control
-back to the top of the loop, so in the `Err` case, we never assign a value to
-`guess`.
-
-The never type is useful with the `panic!` macro as well. Recall the `unwrap`
-function that we call on `Option<T>` values to produce a value or panic with
-this definition:
+fn main() {
+ let p = Point { x: 0, y: 7 };
-```
-impl<T> Option<T> {
- pub fn unwrap(self) -> T {
- match self {
- Some(val) => val,
- None => panic!(
- "called `Option::unwrap()` on a `None` value"
- ),
+ match p {
+ Point { x, y: 0 } => println!("On the x axis at {x}"),
+ Point { x: 0, y } => println!("On the y axis at {y}"),
+ Point { x, y } => {
+ println!("On neither axis: ({x}, {y})");
}
}
}
```
-In this code, the same thing happens as in the `match` in Listing 19-26: Rust
-sees that `val` has the type `T` and `panic!` has the type `!`, so the result
-of the overall `match` expression is `T`. This code works because `panic!`
-doesn’t produce a value; it ends the program. In the `None` case, we won’t be
-returning a value from `unwrap`, so this code is valid.
+Listing 18-14: Destructuring and matching literal values in one pattern
-One final expression that has the type `!` is a `loop`:
+The first arm will match any point that lies on the `x` axis by specifying that
+the `y` field matches if its value matches the literal `0`. The pattern still
+creates an `x` variable that we can use in the code for this arm.
-```
-print!("forever ");
+Similarly, the second arm matches any point on the `y` axis by specifying that
+the `x` field matches if its value is `0` and creates a variable `y` for the
+value of the `y` field. The third arm doesn’t specify any literals, so it
+matches any other `Point` and creates variables for both the `x` and `y` fields.
-loop {
- print!("and ever ");
-}
-```
+In this example, the value `p` matches the second arm by virtue of `x`
+containing a `0`, so this code will print `On the y axis at 7`.
-Here, the loop never ends, so `!` is the value of the expression. However, this
-wouldn’t be true if we included a `break`, because the loop would terminate
-when it got to the `break`.
-
-### Dynamically Sized Types and the Sized Trait
-
-Rust needs to know certain details about its types, such as how much space to
-allocate for a value of a particular type. This leaves one corner of its type
-system a little confusing at first: the concept of *dynamically sized types*.
-Sometimes referred to as *DSTs* or *unsized types*, these types let us write
-code using values whose size we can know only at runtime.
-
-Let’s dig into the details of a dynamically sized type called `str`, which
-we’ve been using throughout the book. That’s right, not `&str`, but `str` on
-its own, is a DST. We can’t know how long the string is until runtime, meaning
-we can’t create a variable of type `str`, nor can we take an argument of type
-`str`. Consider the following code, which does not work:
-
-```
-let s1: str = "Hello there!";
-let s2: str = "How's it going?";
-```
-
-Rust needs to know how much memory to allocate for any value of a particular
-type, and all values of a type must use the same amount of memory. If Rust
-allowed us to write this code, these two `str` values would need to take up the
-same amount of space. But they have different lengths: `s1` needs 12 bytes of
-storage and `s2` needs 15. This is why it’s not possible to create a variable
-holding a dynamically sized type.
-
-So what do we do? In this case, you already know the answer: we make the types
-of `s1` and `s2` a `&str` rather than a `str`. Recall from “String Slices” on
-page XX that the slice data structure just stores the starting position and the
-length of the slice. So, although a `&T` is a single value that stores the
-memory address of where the `T` is located, a `&str` is *two* values: the
-address of the `str` and its length. As such, we can know the size of a `&str`
-value at compile time: it’s twice the length of a `usize`. That is, we always
-know the size of a `&str`, no matter how long the string it refers to is. In
-general, this is the way in which dynamically sized types are used in Rust:
-they have an extra bit of metadata that stores the size of the dynamic
-information. The golden rule of dynamically sized types is that we must always
-put values of dynamically sized types behind a pointer of some kind.
-
-We can combine `str` with all kinds of pointers: for example, `Box<str>` or
-`Rc<str>`. In fact, you’ve seen this before but with a different dynamically
-sized type: traits. Every trait is a dynamically sized type we can refer to by
-using the name of the trait. In “Using Trait Objects That Allow for Values of
-Different Types” on page XX, we mentioned that to use traits as trait objects,
-we must put them behind a pointer, such as `&dyn Trait` or `Box<dyn Trait>`
-(`Rc<dyn Trait>` would work too).
-
-To work with DSTs, Rust provides the `Sized` trait to determine whether or not
-a type’s size is known at compile time. This trait is automatically implemented
-for everything whose size is known at compile time. In addition, Rust
-implicitly adds a bound on `Sized` to every generic function. That is, a
-generic function definition like this:
-
-```
-fn generic<T>(t: T) {
- --snip--
-}
-```
+Remember that a `match` expression stops checking arms once it has found the
+first matching pattern, so even though `Point { x: 0, y: 0}` is on the `x` axis
+and the `y` axis, this code would only print `On the x axis at 0`.
+
+#### Destructuring Enums
+
+We’ve destructured enums in this book (for example, Listing 6-5), but we
+haven’t yet explicitly discussed that the pattern to destructure an enum
+corresponds to the way the data stored within the enum is defined. As an
+example, in Listing 18-15 we use the `Message` enum from Listing 6-2 and write
+a `match` with patterns that will destructure each inner value.
-is actually treated as though we had written this:
+Filename: src/main.rs
```
-fn generic<T: Sized>(t: T) {
- --snip--
+enum Message {
+ Quit,
+ Move { x: i32, y: i32 },
+ Write(String),
+ ChangeColor(i32, i32, i32),
}
-```
-By default, generic functions will work only on types that have a known size at
-compile time. However, you can use the following special syntax to relax this
-restriction:
+fn main() {
+ 1 let msg = Message::ChangeColor(0, 160, 255);
-```
-fn generic<T: ?Sized>(t: &T) {
- --snip--
+ match msg {
+ 2 Message::Quit => {
+ println!(
+ "The Quit variant has no data to destructure."
+ );
+ }
+ 3 Message::Move { x, y } => {
+ println!(
+ "Move in the x dir {x}, in the y dir {y}"
+ );
+ }
+ 4 Message::Write(text) => {
+ println!("Text message: {text}");
+ }
+ 5 Message::ChangeColor(r, g, b) => println!(
+ "Change color to red {r}, green {g}, and blue {b}"
+ ),
+ }
}
```
-A trait bound on `?Sized` means “`T` may or may not be `Sized`” and this
-notation overrides the default that generic types must have a known size at
-compile time. The `?Trait` syntax with this meaning is only available for
-`Sized`, not any other traits.
-
-Also note that we switched the type of the `t` parameter from `T` to `&T`.
-Because the type might not be `Sized`, we need to use it behind some kind of
-pointer. In this case, we’ve chosen a reference.
+Listing 18-15: Destructuring enum variants that hold different kinds of values
-Next, we’ll talk about functions and closures!
+This code will print `Change color to red 0, green 160, and blue 255`. Try
+changing the value of `msg` [1] to see the code from the other arms run.
-## Advanced Functions and Closures
+For enum variants without any data, like `Message::Quit` [2], we can’t
+destructure the value any further. We can only match on the literal
+`Message::Quit` value, and no variables are in that pattern.
-This section explores some advanced features related to functions and closures,
-including function pointers and returning closures.
+For struct-like enum variants, such as `Message::Move` [3], we can use a
+pattern similar to the pattern we specify to match structs. After the variant
+name, we place curly brackets and then list the fields with variables so we
+break apart the pieces to use in the code for this arm. Here we use the
+shorthand form as we did in Listing 18-13.
-### Function Pointers
+For tuple-like enum variants, like `Message::Write` that holds a tuple with one
+element [4] and `Message::ChangeColor` that holds a tuple with three elements
+[5], the pattern is similar to the pattern we specify to match tuples. The
+number of variables in the pattern must match the number of elements in the
+variant we’re matching.
-We’ve talked about how to pass closures to functions; you can also pass regular
-functions to functions! This technique is useful when you want to pass a
-function you’ve already defined rather than defining a new closure. Functions
-coerce to the type `fn` (with a lowercase *f*), not to be confused with the
-`Fn` closure trait. The `fn` type is called a *function pointer*. Passing
-functions with function pointers will allow you to use functions as arguments
-to other functions.
+#### Destructuring Nested Structs and Enums
-The syntax for specifying that a parameter is a function pointer is similar to
-that of closures, as shown in Listing 19-27, where we’ve defined a function
-`add_one` that adds 1 to its parameter. The function `do_twice` takes two
-parameters: a function pointer to any function that takes an `i32` parameter
-and returns an `i32`, and one `i32 value`. The `do_twice` function calls the
-function `f` twice, passing it the `arg` value, then adds the two function call
-results together. The `main` function calls `do_twice` with the arguments
-`add_one` and `5`.
+So far, our examples have all been matching structs or enums one level deep,
+but matching can work on nested items too! For example, we can refactor the
+code in Listing 18-15 to support RGB and HSV colors in the `ChangeColor`
+message, as shown in Listing 18-16.
Filename: src/main.rs
```
-fn add_one(x: i32) -> i32 {
- x + 1
+enum Color {
+ Rgb(i32, i32, i32),
+ Hsv(i32, i32, i32),
}
-fn do_twice(f: fn(i32) -> i32, arg: i32) -> i32 {
- f(arg) + f(arg)
+enum Message {
+ Quit,
+ Move { x: i32, y: i32 },
+ Write(String),
+ ChangeColor(Color),
}
fn main() {
- let answer = do_twice(add_one, 5);
-
- println!("The answer is: {answer}");
+ let msg = Message::ChangeColor(Color::Hsv(0, 160, 255));
+
+ match msg {
+ Message::ChangeColor(Color::Rgb(r, g, b)) => println!(
+ "Change color to red {r}, green {g}, and blue {b}"
+ ),
+ Message::ChangeColor(Color::Hsv(h, s, v)) => println!(
+ "Change color to hue {h}, saturation {s}, value {v}"
+ ),
+ _ => (),
+ }
}
```
-Listing 19-27: Using the `fn` type to accept a function pointer as an argument
-
-This code prints `The answer is: 12`. We specify that the parameter `f` in
-`do_twice` is an `fn` that takes one parameter of type `i32` and returns an
-`i32`. We can then call `f` in the body of `do_twice`. In `main`, we can pass
-the function name `add_one` as the first argument to `do_twice`.
+Listing 18-16: Matching on nested enums
-Unlike closures, `fn` is a type rather than a trait, so we specify `fn` as the
-parameter type directly rather than declaring a generic type parameter with one
-of the `Fn` traits as a trait bound.
+The pattern of the first arm in the `match` expression matches a
+`Message::ChangeColor` enum variant that contains a `Color::Rgb` variant; then
+the pattern binds to the three inner `i32` values. The pattern of the second
+arm also matches a `Message::ChangeColor` enum variant, but the inner enum
+matches `Color::Hsv` instead. We can specify these complex conditions in one
+`match` expression, even though two enums are involved.
-Function pointers implement all three of the closure traits (`Fn`, `FnMut`, and
-`FnOnce`), meaning you can always pass a function pointer as an argument for a
-function that expects a closure. It’s best to write functions using a generic
-type and one of the closure traits so your functions can accept either
-functions or closures.
+#### Destructuring Structs and Tuples
-That said, one example of where you would want to only accept `fn` and not
-closures is when interfacing with external code that doesn’t have closures: C
-functions can accept functions as arguments, but C doesn’t have closures.
-
-As an example of where you could use either a closure defined inline or a named
-function, let’s look at a use of the `map` method provided by the `Iterator`
-trait in the standard library. To use the `map` function to turn a vector of
-numbers into a vector of strings, we could use a closure, like this:
+We can mix, match, and nest destructuring patterns in even more complex ways.
+The following example shows a complicated destructure where we nest structs and
+tuples inside a tuple and destructure all the primitive values out:
```
-let list_of_numbers = vec![1, 2, 3];
-let list_of_strings: Vec<String> = list_of_numbers
- .iter()
- .map(|i| i.to_string())
- .collect();
+let ((feet, inches), Point { x, y }) =
+ ((3, 10), Point { x: 3, y: -10 });
```
-Or we could name a function as the argument to `map` instead of the closure,
-like this:
+This code lets us break complex types into their component parts so we can use
+the values we’re interested in separately.
-```
-let list_of_numbers = vec![1, 2, 3];
-let list_of_strings: Vec<String> = list_of_numbers
- .iter()
- .map(ToString::to_string)
- .collect();
-```
+Destructuring with patterns is a convenient way to use pieces of values, such
+as the value from each field in a struct, separately from each other.
+
+### Ignoring Values in a Pattern
-Note that we must use the fully qualified syntax that we talked about in
-“Advanced Traits” on page XX because there are multiple functions available
-named `to_string`.
+You’ve seen that it’s sometimes useful to ignore values in a pattern, such as
+in the last arm of a `match`, to get a catchall that doesn’t actually do
+anything but does account for all remaining possible values. There are a few
+ways to ignore entire values or parts of values in a pattern: using the `_`
+pattern (which you’ve seen), using the `_` pattern within another pattern,
+using a name that starts with an underscore, or using `..` to ignore remaining
+parts of a value. Let’s explore how and why to use each of these patterns.
-Here, we’re using the `to_string` function defined in the `ToString` trait,
-which the standard library has implemented for any type that implements
-`Display`.
+#### An Entire Value with _
-Recall from “Enum Values” on page XX that the name of each enum variant that we
-define also becomes an initializer function. We can use these initializer
-functions as function pointers that implement the closure traits, which means
-we can specify the initializer functions as arguments for methods that take
-closures, like so:
+We’ve used the underscore as a wildcard pattern that will match any value but
+not bind to the value. This is especially useful as the last arm in a `match`
+expression, but we can also use it in any pattern, including function
+parameters, as shown in Listing 18-17.
+
+Filename: src/main.rs
```
-enum Status {
- Value(u32),
- Stop,
+fn foo(_: i32, y: i32) {
+ println!("This code only uses the y parameter: {y}");
}
-let list_of_statuses: Vec<Status> = (0u32..20)
- .map(Status::Value)
- .collect();
+fn main() {
+ foo(3, 4);
+}
```
-Here, we create `Status::Value` instances using each `u32` value in the range
-that `map` is called on by using the initializer function of `Status::Value`.
-Some people prefer this style and some people prefer to use closures. They
-compile to the same code, so use whichever style is clearer to you.
+Listing 18-17: Using `_` in a function signature
-### Returning Closures
+This code will completely ignore the value `3` passed as the first argument,
+and will print `This code only uses the y parameter: 4`.
-Closures are represented by traits, which means you can’t return closures
-directly. In most cases where you might want to return a trait, you can instead
-use the concrete type that implements the trait as the return value of the
-function. However, you can’t do that with closures because they don’t have a
-concrete type that is returnable; you’re not allowed to use the function
-pointer `fn` as a return type, for example.
+In most cases when you no longer need a particular function parameter, you
+would change the signature so it doesn’t include the unused parameter. Ignoring
+a function parameter can be especially useful in cases when, for example,
+you’re implementing a trait when you need a certain type signature but the
+function body in your implementation doesn’t need one of the parameters. You
+then avoid getting a compiler warning about unused function parameters, as you
+would if you used a name instead.
-The following code tries to return a closure directly, but it won’t compile:
+#### Parts of a Value with a Nested _
-```
-fn returns_closure() -> dyn Fn(i32) -> i32 {
- |x| x + 1
-}
-```
+We can also use `_` inside another pattern to ignore just part of a value, for
+example, when we want to test for only part of a value but have no use for the
+other parts in the corresponding code we want to run. Listing 18-18 shows code
+responsible for managing a setting’s value. The business requirements are that
+the user should not be allowed to overwrite an existing customization of a
+setting but can unset the setting and give it a value if it is currently unset.
-The compiler error is as follows:
+Filename: src/main.rs
```
-error[E0746]: return type cannot have an unboxed trait object
- --> src/lib.rs:1:25
- |
-1 | fn returns_closure() -> dyn Fn(i32) -> i32 {
- | ^^^^^^^^^^^^^^^^^^ doesn't have a size known at
-compile-time
- |
- = note: for information on `impl Trait`, see
-<https://doc.rust-lang.org/book/ch10-02-traits.html#returning-types-that-
-implement-traits>
-help: use `impl Fn(i32) -> i32` as the return type, as all return paths are of
-type `[closure@src/lib.rs:2:5: 2:14]`, which implements `Fn(i32) -> i32`
- |
-1 | fn returns_closure() -> impl Fn(i32) -> i32 {
- | ~~~~~~~~~~~~~~~~~~~
-```
+let mut setting_value = Some(5);
+let new_setting_value = Some(10);
-The error references the `Sized` trait again! Rust doesn’t know how much space
-it will need to store the closure. We saw a solution to this problem earlier.
-We can use a trait object:
-
-```
-fn returns_closure() -> Box<dyn Fn(i32) -> i32> {
- Box::new(|x| x + 1)
+match (setting_value, new_setting_value) {
+ (Some(_), Some(_)) => {
+ println!("Can't overwrite an existing customized value");
+ }
+ _ => {
+ setting_value = new_setting_value;
+ }
}
-```
-
-This code will compile just fine. For more about trait objects, refer to “Using
-Trait Objects That Allow for Values of Different Types” on page XX.
-Next, let’s look at macros!
-
-## Macros
+println!("setting is {:?}", setting_value);
+```
-We’ve used macros like `println!` throughout this book, but we haven’t fully
-explored what a macro is and how it works. The term *macro* refers to a family
-of features in Rust: *declarative* macros with `macro_rules!` and three kinds
-of *procedural* macros:
+Listing 18-18: Using an underscore within patterns that match `Some` variants
+when we don’t need to use the value inside the `Some`
-* Custom `#[derive]` macros that specify code added with the `derive` attribute
-used on structs and enums
-* Attribute-like macros that define custom attributes usable on any item
-* Function-like macros that look like function calls but operate on the tokens
-specified as their argument
+This code will print `Can't overwrite an existing customized value` and then
+`setting is Some(5)`. In the first match arm, we don’t need to match on or use
+the values inside either `Some` variant, but we do need to test for the case
+when `setting_value` and `new_setting_value` are the `Some` variant. In that
+case, we print the reason for not changing `setting_value`, and it doesn’t get
+changed.
-We’ll talk about each of these in turn, but first, let’s look at why we even
-need macros when we already have functions.
+In all other cases (if either `setting_value` or `new_setting_value` is `None`)
+expressed by the `_` pattern in the second arm, we want to allow
+`new_setting_value` to become `setting_value`.
-### The Difference Between Macros and Functions
+We can also use underscores in multiple places within one pattern to ignore
+particular values. Listing 18-19 shows an example of ignoring the second and
+fourth values in a tuple of five items.
-Fundamentally, macros are a way of writing code that writes other code, which
-is known as *metaprogramming*. In Appendix C, we discuss the `derive`
-attribute, which generates an implementation of various traits for you. We’ve
-also used the `println!` and `vec!` macros throughout the book. All of these
-macros *expand* to produce more code than the code you’ve written manually.
+Filename: src/main.rs
-Metaprogramming is useful for reducing the amount of code you have to write and
-maintain, which is also one of the roles of functions. However, macros have
-some additional powers that functions don’t have.
+```
+let numbers = (2, 4, 8, 16, 32);
-A function signature must declare the number and type of parameters the
-function has. Macros, on the other hand, can take a variable number of
-parameters: we can call `println!("hello")` with one argument or
-`println!("hello {}", name)` with two arguments. Also, macros are expanded
-before the compiler interprets the meaning of the code, so a macro can, for
-example, implement a trait on a given type. A function can’t, because it gets
-called at runtime and a trait needs to be implemented at compile time.
+match numbers {
+ (first, _, third, _, fifth) => {
+ println!("Some numbers: {first}, {third}, {fifth}");
+ }
+}
+```
-The downside to implementing a macro instead of a function is that macro
-definitions are more complex than function definitions because you’re writing
-Rust code that writes Rust code. Due to this indirection, macro definitions are
-generally more difficult to read, understand, and maintain than function
-definitions.
+Listing 18-19: Ignoring multiple parts of a tuple
-Another important difference between macros and functions is that you must
-define macros or bring them into scope *before* you call them in a file, as
-opposed to functions you can define anywhere and call anywhere.
+This code will print `Some numbers: 2, 8, 32`, and the values `4` and `16` will
+be ignored.
-### Declarative Macros with macro_rules! for General Metaprogramming
+#### An Unused Variable by Starting Its Name with _
-The most widely used form of macros in Rust is the *declarative macro*. These
-are also sometimes referred to as “macros by example,” “`macro_rules!` macros,”
-or just plain “macros.” At their core, declarative macros allow you to write
-something similar to a Rust `match` expression. As discussed in Chapter 6,
-`match` expressions are control structures that take an expression, compare the
-resultant value of the expression to patterns, and then run the code associated
-with the matching pattern. Macros also compare a value to patterns that are
-associated with particular code: in this situation, the value is the literal
-Rust source code passed to the macro; the patterns are compared with the
-structure of that source code; and the code associated with each pattern, when
-matched, replaces the code passed to the macro. This all happens during
-compilation.
+If you create a variable but don’t use it anywhere, Rust will usually issue a
+warning because an unused variable could be a bug. However, sometimes it’s
+useful to be able to create a variable you won’t use yet, such as when you’re
+prototyping or just starting a project. In this situation, you can tell Rust
+not to warn you about the unused variable by starting the name of the variable
+with an underscore. In Listing 18-20, we create two unused variables, but when
+we compile this code, we should only get a warning about one of them.
-To define a macro, you use the `macro_rules!` construct. Let’s explore how to
-use `macro_rules!` by looking at how the `vec!` macro is defined. Chapter 8
-covered how we can use the `vec!` macro to create a new vector with particular
-values. For example, the following macro creates a new vector containing three
-integers:
+Filename: src/main.rs
```
-let v: Vec<u32> = vec![1, 2, 3];
+fn main() {
+ let _x = 5;
+ let y = 10;
+}
```
-We could also use the `vec!` macro to make a vector of two integers or a vector
-of five string slices. We wouldn’t be able to use a function to do the same
-because we wouldn’t know the number or type of values up front.
+Listing 18-20: Starting a variable name with an underscore to avoid getting
+unused variable warnings
-Listing 19-28 shows a slightly simplified definition of the `vec!` macro.
+Here, we get a warning about not using the variable `y`, but we don’t get a
+warning about not using `_x`.
-Filename: src/lib.rs
+Note that there is a subtle difference between using only `_` and using a name
+that starts with an underscore. The syntax `_x` still binds the value to the
+variable, whereas `_` doesn’t bind at all. To show a case where this
+distinction matters, Listing 18-21 will provide us with an error.
-```
-1 #[macro_export]
-2 macro_rules! vec {
- 3 ( $( $x:expr ),* ) => {
- {
- let mut temp_vec = Vec::new();
- 4 $(
- 5 temp_vec.push(6 $x);
- )*
- 7 temp_vec
- }
- };
-}
-```
+Filename: src/main.rs
-Listing 19-28: A simplified version of the `vec!` macro definition
-
-> Note: The actual definition of the `vec!` macro in the standard library
-includes code to pre-allocate the correct amount of memory up front. That code
-is an optimization that we don’t include here, to make the example simpler.
-
-The `#[macro_export]` annotation [1] indicates that this macro should be made
-available whenever the crate in which the macro is defined is brought into
-scope. Without this annotation, the macro can’t be brought into scope.
-
-We then start the macro definition with `macro_rules!` and the name of the
-macro we’re defining *without* the exclamation mark [2]. The name, in this case
-`vec`, is followed by curly brackets denoting the body of the macro definition.
-
-The structure in the `vec!` body is similar to the structure of a `match`
-expression. Here we have one arm with the pattern `( $( $x:expr ),* )`,
-followed by `=>` and the block of code associated with this pattern [3]. If the
-pattern matches, the associated block of code will be emitted. Given that this
-is the only pattern in this macro, there is only one valid way to match; any
-other pattern will result in an error. More complex macros will have more than
-one arm.
-
-Valid pattern syntax in macro definitions is different from the pattern syntax
-covered in Chapter 18 because macro patterns are matched against Rust code
-structure rather than values. Let’s walk through what the pattern pieces in
-Listing 19-28 mean; for the full macro pattern syntax, see the Rust Reference
-at *https://doc.rust-lang.org/reference/macros-by-example.html*.
-
-First we use a set of parentheses to encompass the whole pattern. We use a
-dollar sign (`$`) to declare a variable in the macro system that will contain
-the Rust code matching the pattern. The dollar sign makes it clear this is a
-macro variable as opposed to a regular Rust variable. Next comes a set of
-parentheses that captures values that match the pattern within the parentheses
-for use in the replacement code. Within `$()` is `$x:expr`, which matches any
-Rust expression and gives the expression the name `$x`.
-
-The comma following `$()` indicates that a literal comma separator character
-could optionally appear after the code that matches the code in `$()`. The `*`
-specifies that the pattern matches zero or more of whatever precedes the `*`.
-
-When we call this macro with `vec![1, 2, 3];`, the `$x` pattern matches three
-times with the three expressions `1`, `2`, and `3`.
-
-Now let’s look at the pattern in the body of the code associated with this arm:
-`temp_vec.push()` [5] within `$()* at [4] and [7] is generated for each part
-that matches `$()` in the pattern zero or more times depending on how many
-times the pattern matches. The `$x` [6] is replaced with each expression
-matched. When we call this macro with `vec![1, 2, 3];`, the code generated that
-replaces this macro call will be the following:
-
-```
-{
- let mut temp_vec = Vec::new();
- temp_vec.push(1);
- temp_vec.push(2);
- temp_vec.push(3);
- temp_vec
-}
```
+let s = Some(String::from("Hello!"));
-We’ve defined a macro that can take any number of arguments of any type and can
-generate code to create a vector containing the specified elements.
-
-To learn more about how to write macros, consult the online documentation or
-other resources, such as “The Little Book of Rust Macros” at
-*https://veykril.github.io/tlborm* started by Daniel Keep and continued by
-Lukas Wirth.
+if let Some(_s) = s {
+ println!("found a string");
+}
-### Procedural Macros for Generating Code from Attributes
+println!("{:?}", s);
+```
-The second form of macros is the procedural macro, which acts more like a
-function (and is a type of procedure). *Procedural macros* accept some code as
-an input, operate on that code, and produce some code as an output rather than
-matching against patterns and replacing the code with other code as declarative
-macros do. The three kinds of procedural macros are custom `derive`,
-attribute-like, and function-like, and all work in a similar fashion.
+Listing 18-21: An unused variable starting with an underscore still binds the
+value, which might take ownership of the value.
-When creating procedural macros, the definitions must reside in their own crate
-with a special crate type. This is for complex technical reasons that we hope
-to eliminate in the future. In Listing 19-29, we show how to define a
-procedural macro, where `some_attribute` is a placeholder for using a specific
-macro variety.
+We’ll receive an error because the `s` value will still be moved into `_s`,
+which prevents us from using `s` again. However, using the underscore by itself
+doesn’t ever bind to the value. Listing 18-22 will compile without any errors
+because `s` doesn’t get moved into `_`.
-Filename: src/lib.rs
+Filename: src/main.rs
```
-use proc_macro::TokenStream;
+let s = Some(String::from("Hello!"));
-#[some_attribute]
-pub fn some_name(input: TokenStream) -> TokenStream {
+if let Some(_) = s {
+ println!("found a string");
}
-```
-Listing 19-29: An example of defining a procedural macro
+println!("{:?}", s);
+```
-The function that defines a procedural macro takes a `TokenStream` as an input
-and produces a `TokenStream` as an output. The `TokenStream` type is defined by
-the `proc_macro` crate that is included with Rust and represents a sequence of
-tokens. This is the core of the macro: the source code that the macro is
-operating on makes up the input `TokenStream`, and the code the macro produces
-is the output `TokenStream`. The function also has an attribute attached to it
-that specifies which kind of procedural macro we’re creating. We can have
-multiple kinds of procedural macros in the same crate.
+Listing 18-22: Using an underscore does not bind the value.
-Let’s look at the different kinds of procedural macros. We’ll start with a
-custom `derive` macro and then explain the small dissimilarities that make the
-other forms different.
+This code works just fine because we never bind `s` to anything; it isn’t moved.
-### How to Write a Custom derive Macro
+#### Remaining Parts of a Value with ..
-Let’s create a crate named `hello_macro` that defines a trait named
-`HelloMacro` with one associated function named `hello_macro`. Rather than
-making our users implement the `HelloMacro` trait for each of their types,
-we’ll provide a procedural macro so users can annotate their type with
-`#[derive(HelloMacro)]` to get a default implementation of the `hello_macro`
-function. The default implementation will print `Hello, Macro! My name is`
-TypeName`!` where TypeName is the name of the type on which this trait has been
-defined. In other words, we’ll write a crate that enables another programmer to
-write code like Listing 19-30 using our crate.
+With values that have many parts, we can use the `..` syntax to use specific
+parts and ignore the rest, avoiding the need to list underscores for each
+ignored value. The `..` pattern ignores any parts of a value that we haven’t
+explicitly matched in the rest of the pattern. In Listing 18-23, we have a
+`Point` struct that holds a coordinate in three-dimensional space. In the
+`match` expression, we want to operate only on the `x` coordinate and ignore
+the values in the `y` and `z` fields.
Filename: src/main.rs
```
-use hello_macro::HelloMacro;
-use hello_macro_derive::HelloMacro;
+struct Point {
+ x: i32,
+ y: i32,
+ z: i32,
+}
-#[derive(HelloMacro)]
-struct Pancakes;
+let origin = Point { x: 0, y: 0, z: 0 };
-fn main() {
- Pancakes::hello_macro();
+match origin {
+ Point { x, .. } => println!("x is {x}"),
}
```
-Listing 19-30: The code a user of our crate will be able to write when using
-our procedural macro
+Listing 18-23: Ignoring all fields of a `Point` except for `x` by using `..`
-This code will print `Hello, Macro! My name is Pancakes!` when we’re done. The
-first step is to make a new library crate, like this:
+We list the `x` value and then just include the `..` pattern. This is quicker
+than having to list `y: _` and `z: _`, particularly when we’re working with
+structs that have lots of fields in situations where only one or two fields are
+relevant.
-```
-$ cargo new hello_macro --lib
-```
+The syntax `..` will expand to as many values as it needs to be. Listing 18-24
+shows how to use `..` with a tuple.
-Next, we’ll define the `HelloMacro` trait and its associated function:
-
-Filename: src/lib.rs
+Filename: src/main.rs
```
-pub trait HelloMacro {
- fn hello_macro();
+fn main() {
+ let numbers = (2, 4, 8, 16, 32);
+
+ match numbers {
+ (first, .., last) => {
+ println!("Some numbers: {first}, {last}");
+ }
+ }
}
```
-We have a trait and its function. At this point, our crate user could implement
-the trait to achieve the desired functionality, like so:
+Listing 18-24: Matching only the first and last values in a tuple and ignoring
+all other values
-```
-use hello_macro::HelloMacro;
+In this code, the first and last values are matched with `first` and `last`.
+The `..` will match and ignore everything in the middle.
-struct Pancakes;
+However, using `..` must be unambiguous. If it is unclear which values are
+intended for matching and which should be ignored, Rust will give us an error.
+Listing 18-25 shows an example of using `..` ambiguously, so it will not
+compile.
-impl HelloMacro for Pancakes {
- fn hello_macro() {
- println!("Hello, Macro! My name is Pancakes!");
- }
-}
+Filename: src/main.rs
+```
fn main() {
- Pancakes::hello_macro();
+ let numbers = (2, 4, 8, 16, 32);
+
+ match numbers {
+ (.., second, ..) => {
+ println!("Some numbers: {second}");
+ },
+ }
}
```
-However, they would need to write the implementation block for each type they
-wanted to use with `hello_macro`; we want to spare them from having to do this
-work.
-
-Additionally, we can’t yet provide the `hello_macro` function with default
-implementation that will print the name of the type the trait is implemented
-on: Rust doesn’t have reflection capabilities, so it can’t look up the type’s
-name at runtime. We need a macro to generate code at compile time.
+Listing 18-25: An attempt to use `..` in an ambiguous way
-The next step is to define the procedural macro. At the time of this writing,
-procedural macros need to be in their own crate. Eventually, this restriction
-might be lifted. The convention for structuring crates and macro crates is as
-follows: for a crate named foo, a custom `derive` procedural macro crate is
-called foo`_derive`. Let’s start a new crate called `hello_macro_derive` inside
-our `hello_macro` project:
+When we compile this example, we get this error:
```
-$ cargo new hello_macro_derive --lib
+error: `..` can only be used once per tuple pattern
+ --> src/main.rs:5:22
+ |
+5 | (.., second, ..) => {
+ | -- ^^ can only be used once per tuple pattern
+ | |
+ | previously used here
```
-Our two crates are tightly related, so we create the procedural macro crate
-within the directory of our `hello_macro` crate. If we change the trait
-definition in `hello_macro`, we’ll have to change the implementation of the
-procedural macro in `hello_macro_derive` as well. The two crates will need to
-be published separately, and programmers using these crates will need to add
-both as dependencies and bring them both into scope. We could instead have the
-`hello_macro` crate use `hello_macro_derive` as a dependency and re-export the
-procedural macro code. However, the way we’ve structured the project makes it
-possible for programmers to use `hello_macro` even if they don’t want the
-`derive` functionality.
+It’s impossible for Rust to determine how many values in the tuple to ignore
+before matching a value with `second` and then how many further values to
+ignore thereafter. This code could mean that we want to ignore `2`, bind
+`second` to `4`, and then ignore `8`, `16`, and `32`; or that we want to ignore
+`2` and `4`, bind `second` to `8`, and then ignore `16` and `32`; and so forth.
+The variable name `second` doesn’t mean anything special to Rust, so we get a
+compiler error because using `..` in two places like this is ambiguous.
+
+### Extra Conditionals with Match Guards
+
+A *match guard* is an additional `if` condition, specified after the pattern in
+a `match` arm, that must also match for that arm to be chosen. Match guards are
+useful for expressing more complex ideas than a pattern alone allows.
-We need to declare the `hello_macro_derive` crate as a procedural macro crate.
-We’ll also need functionality from the `syn` and `quote` crates, as you’ll see
-in a moment, so we need to add them as dependencies. Add the following to the
-*Cargo.toml* file for `hello_macro_derive`:
+The condition can use variables created in the pattern. Listing 18-26 shows a
+`match` where the first arm has the pattern `Some(x)` and also has a match
+guard of `if x % 2 == 0` (which will be `true` if the number is even).
-Filename: hello_macro_derive/Cargo.toml
+Filename: src/main.rs
```
-[lib]
-proc-macro = true
+let num = Some(4);
-[dependencies]
-syn = "1.0"
-quote = "1.0"
+match num {
+ Some(x) if x % 2 == 0 => println!("The number {x} is even"),
+ Some(x) => println!("The number {x} is odd"),
+ None => (),
+}
```
-To start defining the procedural macro, place the code in Listing 19-31 into
-your *src/lib.rs* file for the `hello_macro_derive` crate. Note that this code
-won’t compile until we add a definition for the `impl_hello_macro` function.
+Listing 18-26: Adding a match guard to a pattern
-Filename: hello_macro_derive/src/lib.rs
+This example will print `The number 4 is even`. When `num` is compared to the
+pattern in the first arm, it matches because `Some(4)` matches `Some(x)`. Then
+the match guard checks whether the remainder of dividing `x` by 2 is equal to
+0, and because it is, the first arm is selected.
-```
-use proc_macro::TokenStream;
-use quote::quote;
-use syn;
+If `num` had been `Some(5)` instead, the match guard in the first arm would
+have been `false` because the remainder of 5 divided by 2 is 1, which is not
+equal to 0. Rust would then go to the second arm, which would match because the
+second arm doesn’t have a match guard and therefore matches any `Some` variant.
-#[proc_macro_derive(HelloMacro)]
-pub fn hello_macro_derive(input: TokenStream) -> TokenStream {
- // Construct a representation of Rust code as a syntax tree
- // that we can manipulate
- let ast = syn::parse(input).unwrap();
+There is no way to express the `if x % 2 == 0` condition within a pattern, so
+the match guard gives us the ability to express this logic. The downside of
+this additional expressiveness is that the compiler doesn’t try to check for
+exhaustiveness when match guard expressions are involved.
- // Build the trait implementation
- impl_hello_macro(&ast)
-}
-```
+In Listing 18-11, we mentioned that we could use match guards to solve our
+pattern-shadowing problem. Recall that we created a new variable inside the
+pattern in the `match` expression instead of using the variable outside the
+`match`. That new variable meant we couldn’t test against the value of the
+outer variable. Listing 18-27 shows how we can use a match guard to fix this
+problem.
-Listing 19-31: Code that most procedural macro crates will require in order to
-process Rust code
-
-Notice that we’ve split the code into the `hello_macro_derive` function, which
-is responsible for parsing the `TokenStream`, and the `impl_hello_macro`
-function, which is responsible for transforming the syntax tree: this makes
-writing a procedural macro more convenient. The code in the outer function
-(`hello_macro_derive` in this case) will be the same for almost every
-procedural macro crate you see or create. The code you specify in the body of
-the inner function (`impl_hello_macro` in this case) will be different
-depending on your procedural macro’s purpose.
-
-We’ve introduced three new crates: `proc_macro`, `syn` (available from
-*https://crates.io/crates/syn*), and `quote` (available from
-*https://crates.io/crates/quote*). The `proc_macro` crate comes with Rust, so
-we didn’t need to add that to the dependencies in *Cargo.toml*. The
-`proc_macro` crate is the compiler’s API that allows us to read and manipulate
-Rust code from our code.
-
-The `syn` crate parses Rust code from a string into a data structure that we
-can perform operations on. The `quote` crate turns `syn` data structures back
-into Rust code. These crates make it much simpler to parse any sort of Rust
-code we might want to handle: writing a full parser for Rust code is no simple
-task.
-
-The `hello_macro_derive` function will be called when a user of our library
-specifies `#[derive(HelloMacro)]` on a type. This is possible because we’ve
-annotated the `hello_macro_derive` function here with `proc_macro_derive` and
-specified the name `HelloMacro`, which matches our trait name; this is the
-convention most procedural macros follow.
-
-The `hello_macro_derive` function first converts the `input` from a
-`TokenStream` to a data structure that we can then interpret and perform
-operations on. This is where `syn` comes into play. The `parse` function in
-`syn` takes a `TokenStream` and returns a `DeriveInput` struct representing the
-parsed Rust code. Listing 19-32 shows the relevant parts of the `DeriveInput`
-struct we get from parsing the `struct Pancakes;` string.
-
-```
-DeriveInput {
- --snip--
-
- ident: Ident {
- ident: "Pancakes",
- span: #0 bytes(95..103)
- },
- data: Struct(
- DataStruct {
- struct_token: Struct,
- fields: Unit,
- semi_token: Some(
- Semi
- )
- }
- )
-}
-```
+Filename: src/main.rs
-Listing 19-32: The `DeriveInput` instance we get when parsing the code that has
-the macro’s attribute in Listing 19-30
-
-The fields of this struct show that the Rust code we’ve parsed is a unit struct
-with the `ident` (*identifier*, meaning the name) of `Pancakes`. There are more
-fields on this struct for describing all sorts of Rust code; check the `syn`
-documentation for `DeriveInput` at
-*https://docs.rs/syn/1.0/syn/struct.DeriveInput.html* for more information.
-
-Soon we’ll define the `impl_hello_macro` function, which is where we’ll build
-the new Rust code we want to include. But before we do, note that the output
-for our `derive` macro is also a `TokenStream`. The returned `TokenStream` is
-added to the code that our crate users write, so when they compile their crate,
-they’ll get the extra functionality that we provide in the modified
-`TokenStream`.
-
-You might have noticed that we’re calling `unwrap` to cause the
-`hello_macro_derive` function to panic if the call to the `syn::parse` function
-fails here. It’s necessary for our procedural macro to panic on errors because
-`proc_macro_derive` functions must return `TokenStream` rather than `Result` to
-conform to the procedural macro API. We’ve simplified this example by using
-`unwrap`; in production code, you should provide more specific error messages
-about what went wrong by using `panic!` or `expect`.
-
-Now that we have the code to turn the annotated Rust code from a `TokenStream`
-into a `DeriveInput` instance, let’s generate the code that implements the
-`HelloMacro` trait on the annotated type, as shown in Listing 19-33.
-
-Filename: hello_macro_derive/src/lib.rs
-
-```
-fn impl_hello_macro(ast: &syn::DeriveInput) -> TokenStream {
- let name = &ast.ident;
- let gen = quote! {
- impl HelloMacro for #name {
- fn hello_macro() {
- println!(
- "Hello, Macro! My name is {}!",
- stringify!(#name)
- );
- }
- }
- };
- gen.into()
-}
```
+fn main() {
+ let x = Some(5);
+ let y = 10;
-Listing 19-33: Implementing the `HelloMacro` trait using the parsed Rust code
+ match x {
+ Some(50) => println!("Got 50"),
+ Some(n) if n == y => println!("Matched, n = {n}"),
+ _ => println!("Default case, x = {:?}", x),
+ }
-We get an `Ident` struct instance containing the name (identifier) of the
-annotated type using `ast.ident`. The struct in Listing 19-32 shows that when
-we run the `impl_hello_macro` function on the code in Listing 19-30, the
-`ident` we get will have the `ident` field with a value of `"Pancakes"`. Thus
-the `name` variable in Listing 19-33 will contain an `Ident` struct instance
-that, when printed, will be the string `"Pancakes"`, the name of the struct in
-Listing 19-30.
+ println!("at the end: x = {:?}, y = {y}", x);
+}
+```
-The `quote!` macro lets us define the Rust code that we want to return. The
-compiler expects something different to the direct result of the `quote!`
-macro’s execution, so we need to convert it to a `TokenStream`. We do this by
-calling the `into` method, which consumes this intermediate representation and
-returns a value of the required `TokenStream` type.
+Listing 18-27: Using a match guard to test for equality with an outer variable
-The `quote!` macro also provides some very cool templating mechanics: we can
-enter `#name`, and `quote!` will replace it with the value in the variable
-`name`. You can even do some repetition similar to the way regular macros work.
-Check out the `quote` crate’s docs at *https://docs.rs/quote* for a thorough
-introduction.
+This code will now print `Default case, x = Some(5)`. The pattern in the second
+match arm doesn’t introduce a new variable `y` that would shadow the outer `y`,
+meaning we can use the outer `y` in the match guard. Instead of specifying the
+pattern as `Some(y)`, which would have shadowed the outer `y`, we specify
+`Some(n)`. This creates a new variable `n` that doesn’t shadow anything because
+there is no `n` variable outside the `match`.
-We want our procedural macro to generate an implementation of our `HelloMacro`
-trait for the type the user annotated, which we can get by using `#name`. The
-trait implementation has the one function `hello_macro`, whose body contains
-the functionality we want to provide: printing `Hello, Macro! My name is` and
-then the name of the annotated type.
+The match guard `if n == y` is not a pattern and therefore doesn’t introduce
+new variables. This `y` *is* the outer `y` rather than a new shadowed `y`, and
+we can look for a value that has the same value as the outer `y` by comparing
+`n` to `y`.
-The `stringify!` macro used here is built into Rust. It takes a Rust
-expression, such as `1 + 2`, and at compile time turns the expression into a
-string literal, such as `"1 + 2"`. This is different from `format!` or
-`println!`, macros which evaluate the expression and then turn the result into
-a `String`. There is a possibility that the `#name` input might be an
-expression to print literally, so we use `stringify!`. Using `stringify!` also
-saves an allocation by converting `#name` to a string literal at compile time.
+You can also use the *or* operator `|` in a match guard to specify multiple
+patterns; the match guard condition will apply to all the patterns. Listing
+18-28 shows the precedence when combining a pattern that uses `|` with a match
+guard. The important part of this example is that the `if y` match guard
+applies to `4`, `5`, *and* `6`, even though it might look like `if y` only
+applies to `6`.
-At this point, `cargo build` should complete successfully in both `hello_macro`
-and `hello_macro_derive`. Let’s hook up these crates to the code in Listing
-19-30 to see the procedural macro in action! Create a new binary project in
-your *projects* directory using `cargo new pancakes`. We need to add
-`hello_macro` and `hello_macro_derive` as dependencies in the `pancakes`
-crate’s *Cargo.toml*. If you’re publishing your versions of `hello_macro` and
-`hello_macro_derive` to *https://crates.io*, they would be regular
-dependencies; if not, you can specify them as `path` dependencies as follows:
+Filename: src/main.rs
```
-[dependencies]
-hello_macro = { path = "../hello_macro" }
-hello_macro_derive = { path = "../hello_macro/hello_macro_derive" }
-```
+let x = 4;
+let y = false;
-Put the code in Listing 19-30 into *src/main.rs*, and run `cargo run`: it
-should print `Hello, Macro! My name is Pancakes!` The implementation of the
-`HelloMacro` trait from the procedural macro was included without the
-`pancakes` crate needing to implement it; the `#[derive(HelloMacro)]` added the
-trait implementation.
-
-Next, let’s explore how the other kinds of procedural macros differ from custom
-`derive` macros.
+match x {
+ 4 | 5 | 6 if y => println!("yes"),
+ _ => println!("no"),
+}
+```
-### Attribute-like Macros
+Listing 18-28: Combining multiple patterns with a match guard
-Attribute-like macros are similar to custom `derive` macros, but instead of
-generating code for the `derive` attribute, they allow you to create new
-attributes. They’re also more flexible: `derive` only works for structs and
-enums; attributes can be applied to other items as well, such as functions.
-Here’s an example of using an attribute-like macro. Say you have an attribute
-named `route` that annotates functions when using a web application framework:
+The match condition states that the arm only matches if the value of `x` is
+equal to `4`, `5`, or `6` *and* if `y` is `true`. When this code runs, the
+pattern of the first arm matches because `x` is `4`, but the match guard `if y`
+is `false`, so the first arm is not chosen. The code moves on to the second
+arm, which does match, and this program prints `no`. The reason is that the
+`if` condition applies to the whole pattern `4 | 5 | 6`, not just to the last
+value `6`. In other words, the precedence of a match guard in relation to a
+pattern behaves like this:
```
-#[route(GET, "/")]
-fn index() {
+(4 | 5 | 6) if y => ...
```
-This `#[route]` attribute would be defined by the framework as a procedural
-macro. The signature of the macro definition function would look like this:
+rather than this:
```
-#[proc_macro_attribute]
-pub fn route(
- attr: TokenStream,
- item: TokenStream
-) -> TokenStream {
+4 | 5 | (6 if y) => ...
```
-Here, we have two parameters of type `TokenStream`. The first is for the
-contents of the attribute: the `GET, "/"` part. The second is the body of the
-item the attribute is attached to: in this case, `fn index() {}` and the rest
-of the function’s body.
+After running the code, the precedence behavior is evident: if the match guard
+were applied only to the final value in the list of values specified using the
+`|` operator, the arm would have matched and the program would have printed
+`yes`.
-Other than that, attribute-like macros work the same way as custom `derive`
-macros: you create a crate with the `proc-macro` crate type and implement a
-function that generates the code you want!
+### @ Bindings
-### Function-like Macros
+The *at* operator `@` lets us create a variable that holds a value at the same
+time we’re testing that value for a pattern match. In Listing 18-29, we want to
+test that a `Message::Hello` `id` field is within the range `3..=7`. We also
+want to bind the value to the variable `id_variable` so we can use it in the
+code associated with the arm. We could name this variable `id`, the same as the
+field, but for this example we’ll use a different name.
-Function-like macros define macros that look like function calls. Similarly to
-`macro_rules!` macros, they’re more flexible than functions; for example, they
-can take an unknown number of arguments. However, `macro_rules!` macros can
-only be defined using the match-like syntax we discussed in “Declarative Macros
-with macro_rules! for General Metaprogramming” on page XX. Function-like macros
-take a `TokenStream` parameter, and their definition manipulates that
-`TokenStream` using Rust code as the other two types of procedural macros do.
-An example of a function-like macro is an `sql!` macro that might be called
-like so:
+Filename: src/main.rs
```
-let sql = sql!(SELECT * FROM posts WHERE id=1);
-```
+enum Message {
+ Hello { id: i32 },
+}
-This macro would parse the SQL statement inside it and check that it’s
-syntactically correct, which is much more complex processing than a
-`macro_rules!` macro can do. The `sql!` macro would be defined like this:
+let msg = Message::Hello { id: 5 };
+match msg {
+ Message::Hello {
+ id: id_variable @ 3..=7,
+ } => println!("Found an id in range: {id_variable}"),
+ Message::Hello { id: 10..=12 } => {
+ println!("Found an id in another range")
+ }
+ Message::Hello { id } => println!("Some other id: {id}"),
+}
```
-#[proc_macro]
-pub fn sql(input: TokenStream) -> TokenStream {
-```
-This definition is similar to the custom `derive` macro’s signature: we receive
-the tokens that are inside the parentheses and return the code we wanted to
-generate.
+Listing 18-29: Using `@` to bind to a value in a pattern while also testing it
+
+This example will print `Found an id in range: 5`. By specifying `id_variable
+@` before the range `3..=7`, we’re capturing whatever value matched the range
+while also testing that the value matched the range pattern.
+
+In the second arm, where we only have a range specified in the pattern, the
+code associated with the arm doesn’t have a variable that contains the actual
+value of the `id` field. The `id` field’s value could have been 10, 11, or 12,
+but the code that goes with that pattern doesn’t know which it is. The pattern
+code isn’t able to use the value from the `id` field because we haven’t saved
+the `id` value in a variable.
+
+In the last arm, where we’ve specified a variable without a range, we do have
+the value available to use in the arm’s code in a variable named `id`. The
+reason is that we’ve used the struct field shorthand syntax. But we haven’t
+applied any test to the value in the `id` field in this arm, as we did with the
+first two arms: any value would match this pattern.
+
+Using `@` lets us test a value and save it in a variable within one pattern.
## Summary
-Whew! Now you have some Rust features in your toolbox that you likely won’t use
-often, but you’ll know they’re available in very particular circumstances.
-We’ve introduced several complex topics so that when you encounter them in
-error message suggestions or in other people’s code, you’ll be able to
-recognize these concepts and syntax. Use this chapter as a reference to guide
-you to solutions.
+Rust’s patterns are very useful in distinguishing between different kinds of
+data. When used in `match` expressions, Rust ensures your patterns cover every
+possible value, or your program won’t compile. Patterns in `let` statements and
+function parameters make those constructs more useful, enabling the
+destructuring of values into smaller parts at the same time as assigning to
+variables. We can create simple or complex patterns to suit our needs.
-Next, we’ll put everything we’ve discussed throughout the book into practice
-and do one more project!
+Next, for the penultimate chapter of the book, we’ll look at some advanced
+aspects of a variety of Rust’s features.
diff --git a/rustbook-en/nostarch/chapter20.md b/rustbook-en/nostarch/chapter20.md
index 9d4e22cd7..410e7eb62 100644
--- a/rustbook-en/nostarch/chapter20.md
+++ b/rustbook-en/nostarch/chapter20.md
@@ -6,1989 +6,2291 @@ directory, so all fixes need to be made in `/src/`.
[TOC]
-# Final Project: Building a Multithreaded Web Server
+# Advanced Features
+
+By now, you’ve learned the most commonly used parts of the Rust programming
+language. Before we do one more project, in Chapter 20, we’ll look at a few
+aspects of the language you might run into every once in a while, but may not
+use every day. You can use this chapter as a reference for when you encounter
+any unknowns. The features covered here are useful in very specific situations.
+Although you might not reach for them often, we want to make sure you have a
+grasp of all the features Rust has to offer.
+
+In this chapter, we’ll cover:
+
+* Unsafe Rust: how to opt out of some of Rust’s guarantees and take
+responsibility for manually upholding those guarantees
+* Advanced traits: associated types, default type parameters, fully qualified
+syntax, supertraits, and the newtype pattern in relation to traits
+* Advanced types: more about the newtype pattern, type aliases, the never type,
+and dynamically sized types
+* Advanced functions and closures: function pointers and returning closures
+* Macros: ways to define code that defines more code at compile time
+
+It’s a panoply of Rust features with something for everyone! Let’s dive in!
+
+## Unsafe Rust
+
+All the code we’ve discussed so far has had Rust’s memory safety guarantees
+enforced at compile time. However, Rust has a second language hidden inside it
+that doesn’t enforce these memory safety guarantees: it’s called *unsafe Rust*
+and works just like regular Rust, but gives us extra superpowers.
+
+Unsafe Rust exists because, by nature, static analysis is conservative. When
+the compiler tries to determine whether or not code upholds the guarantees,
+it’s better for it to reject some valid programs than to accept some invalid
+programs. Although the code *might* be okay, if the Rust compiler doesn’t have
+enough information to be confident, it will reject the code. In these cases,
+you can use unsafe code to tell the compiler, “Trust me, I know what I’m
+doing.” Be warned, however, that you use unsafe Rust at your own risk: if you
+use unsafe code incorrectly, problems can occur due to memory unsafety, such as
+null pointer dereferencing.
+
+Another reason Rust has an unsafe alter ego is that the underlying computer
+hardware is inherently unsafe. If Rust didn’t let you do unsafe operations, you
+couldn’t do certain tasks. Rust needs to allow you to do low-level systems
+programming, such as directly interacting with the operating system or even
+writing your own operating system. Working with low-level systems programming
+is one of the goals of the language. Let’s explore what we can do with unsafe
+Rust and how to do it.
+
+### Unsafe Superpowers
+
+To switch to unsafe Rust, use the `unsafe` keyword and then start a new block
+that holds the unsafe code. You can take five actions in unsafe Rust that you
+can’t in safe Rust, which we call *unsafe superpowers*. Those superpowers
+include the ability to:
+
+1. Dereference a raw pointer
+1. Call an unsafe function or method
+1. Access or modify a mutable static variable
+1. Implement an unsafe trait
+1. Access fields of `union`s
+
+It’s important to understand that `unsafe` doesn’t turn off the borrow checker
+or disable any of Rust’s other safety checks: if you use a reference in unsafe
+code, it will still be checked. The `unsafe` keyword only gives you access to
+these five features that are then not checked by the compiler for memory
+safety. You’ll still get some degree of safety inside an unsafe block.
+
+In addition, `unsafe` does not mean the code inside the block is necessarily
+dangerous or that it will definitely have memory safety problems: the intent is
+that as the programmer, you’ll ensure the code inside an `unsafe` block will
+access memory in a valid way.
+
+People are fallible and mistakes will happen, but by requiring these five
+unsafe operations to be inside blocks annotated with `unsafe`, you’ll know that
+any errors related to memory safety must be within an `unsafe` block. Keep
+`unsafe` blocks small; you’ll be thankful later when you investigate memory
+bugs.
+
+To isolate unsafe code as much as possible, it’s best to enclose such code
+within a safe abstraction and provide a safe API, which we’ll discuss later in
+the chapter when we examine unsafe functions and methods. Parts of the standard
+library are implemented as safe abstractions over unsafe code that has been
+audited. Wrapping unsafe code in a safe abstraction prevents uses of `unsafe`
+from leaking out into all the places that you or your users might want to use
+the functionality implemented with `unsafe` code, because using a safe
+abstraction is safe.
+
+Let’s look at each of the five unsafe superpowers in turn. We’ll also look at
+some abstractions that provide a safe interface to unsafe code.
+
+### Dereferencing a Raw Pointer
+
+In “Dangling References” on page XX, we mentioned that the compiler ensures
+references are always valid. Unsafe Rust has two new types called *raw
+pointers* that are similar to references. As with references, raw pointers can
+be immutable or mutable and are written as `*const T` and `*mut T`,
+respectively. The asterisk isn’t the dereference operator; it’s part of the
+type name. In the context of raw pointers, *immutable* means that the pointer
+can’t be directly assigned to after being dereferenced.
+
+Different from references and smart pointers, raw pointers:
+
+* Are allowed to ignore the borrowing rules by having both immutable and
+mutable pointers or multiple mutable pointers to the same location
+* Aren’t guaranteed to point to valid memory
+* Are allowed to be null
+* Don’t implement any automatic cleanup
-It’s been a long journey, but we’ve reached the end of the book. In this
-chapter, we’ll build one more project together to demonstrate some of the
-concepts we covered in the final chapters, as well as recap some earlier
-lessons.
+By opting out of having Rust enforce these guarantees, you can give up
+guaranteed safety in exchange for greater performance or the ability to
+interface with another language or hardware where Rust’s guarantees don’t apply.
-For our final project, we’ll make a web server that says “hello” and looks like
-Figure 20-1 in a web browser.
-
-Figure 20-1: Our final shared project
-
-Here is our plan for building the web server:
-
-1. Learn a bit about TCP and HTTP.
-1. Listen for TCP connections on a socket.
-1. Parse a small number of HTTP requests.
-1. Create a proper HTTP response.
-1. Improve the throughput of our server with a thread pool.
-
-Before we get started, we should mention one detail: the method we’ll use won’t
-be the best way to build a web server with Rust. Community members have
-published a number of production-ready crates available at *https://crates.io*
-that provide more complete web server and thread pool implementations than
-we’ll build. However, our intention in this chapter is to help you learn, not
-to take the easy route. Because Rust is a systems programming language, we can
-choose the level of abstraction we want to work with and can go to a lower
-level than is possible or practical in other languages. We’ll therefore write
-the basic HTTP server and thread pool manually so you can learn the general
-ideas and techniques behind the crates you might use in the future.
-
-## Building a Single-Threaded Web Server
+Listing 19-1 shows how to create an immutable and a mutable raw pointer from
+references.
+
+```
+let mut num = 5;
-We’ll start by getting a single-threaded web server working. Before we begin,
-let’s look at a quick overview of the protocols involved in building web
-servers. The details of these protocols are beyond the scope of this book, but
-a brief overview will give you the information you need.
+let r1 = &num as *const i32;
+let r2 = &mut num as *mut i32;
+```
-The two main protocols involved in web servers are *Hypertext Transfer
-Protocol* *(HTTP)* and *Transmission Control Protocol* *(TCP)*. Both protocols
-are *request-response* protocols, meaning a *client* initiates requests and a
-*server* listens to the requests and provides a response to the client. The
-contents of those requests and responses are defined by the protocols.
+Listing 19-1: Creating raw pointers from references
-TCP is the lower-level protocol that describes the details of how information
-gets from one server to another but doesn’t specify what that information is.
-HTTP builds on top of TCP by defining the contents of the requests and
-responses. It’s technically possible to use HTTP with other protocols, but in
-the vast majority of cases, HTTP sends its data over TCP. We’ll work with the
-raw bytes of TCP and HTTP requests and responses.
+Notice that we don’t include the `unsafe` keyword in this code. We can create
+raw pointers in safe code; we just can’t dereference raw pointers outside an
+unsafe block, as you’ll see in a bit.
-### Listening to the TCP Connection
+We’ve created raw pointers by using `as` to cast an immutable and a mutable
+reference into their corresponding raw pointer types. Because we created them
+directly from references guaranteed to be valid, we know these particular raw
+pointers are valid, but we can’t make that assumption about just any raw
+pointer.
-Our web server needs to listen to a TCP connection, so that’s the first part
-we’ll work on. The standard library offers a `std::net` module that lets us do
-this. Let’s make a new project in the usual fashion:
+To demonstrate this, next we’ll create a raw pointer whose validity we can’t be
+so certain of. Listing 19-2 shows how to create a raw pointer to an arbitrary
+location in memory. Trying to use arbitrary memory is undefined: there might be
+data at that address or there might not, the compiler might optimize the code
+so there is no memory access, or the program might terminate with a
+segmentation fault. Usually, there is no good reason to write code like this,
+but it is possible.
```
-$ cargo new hello
- Created binary (application) `hello` project
-$ cd hello
+let address = 0x012345usize;
+let r = address as *const i32;
```
-Now enter the code in Listing 20-1 in *src/main.rs* to start. This code will
-listen at the local address `127.0.0.1:7878` for incoming TCP streams. When it
-gets an incoming stream, it will print `Connection established!`.
+Listing 19-2: Creating a raw pointer to an arbitrary memory address
-Filename: src/main.rs
+Recall that we can create raw pointers in safe code, but we can’t *dereference*
+raw pointers and read the data being pointed to. In Listing 19-3, we use the
+dereference operator `*` on a raw pointer that requires an `unsafe` block.
```
-use std::net::TcpListener;
-
-fn main() {
- 1 let listener = TcpListener::bind("127.0.0.1:7878").unwrap();
+let mut num = 5;
- 2 for stream in listener.incoming() {
- 3 let stream = stream.unwrap();
+let r1 = &num as *const i32;
+let r2 = &mut num as *mut i32;
- 4 println!("Connection established!");
- }
+unsafe {
+ println!("r1 is: {}", *r1);
+ println!("r2 is: {}", *r2);
}
```
-Listing 20-1: Listening for incoming streams and printing a message when we
-receive a stream
-
-Using `TcpListener`, we can listen for TCP connections at the address
-`127.0.0.1:7878` [1]. In the address, the section before the colon is an IP
-address representing your computer (this is the same on every computer and
-doesn’t represent the authors’ computer specifically), and `7878` is the port.
-We’ve chosen this port for two reasons: HTTP isn’t normally accepted on this
-port, so our server is unlikely to conflict with any other web server you might
-have running on your machine, and 7878 is *rust* typed on a telephone.
-
-The `bind` function in this scenario works like the `new` function in that it
-will return a new `TcpListener` instance. The function is called `bind`
-because, in networking, connecting to a port to listen to is known as “binding
-to a port.”
-
-The `bind` function returns a `Result<T, E>`, which indicates that it’s
-possible for binding to fail. For example, connecting to port 80 requires
-administrator privileges (non-administrators can listen only on ports higher
-than 1023), so if we tried to connect to port 80 without being an
-administrator, binding wouldn’t work. Binding also wouldn’t work, for example,
-if we ran two instances of our program and so had two programs listening to the
-same port. Because we’re writing a basic server just for learning purposes, we
-won’t worry about handling these kinds of errors; instead, we use `unwrap` to
-stop the program if errors happen.
-
-The `incoming` method on `TcpListener` returns an iterator that gives us a
-sequence of streams [2] (more specifically, streams of type `TcpStream`). A
-single *stream* represents an open connection between the client and the
-server. A *connection* is the name for the full request and response process in
-which a client connects to the server, the server generates a response, and the
-server closes the connection. As such, we will read from the `TcpStream` to see
-what the client sent and then write our response to the stream to send data
-back to the client. Overall, this `for` loop will process each connection in
-turn and produce a series of streams for us to handle.
-
-For now, our handling of the stream consists of calling `unwrap` to terminate
-our program if the stream has any errors [3]; if there aren’t any errors, the
-program prints a message [4]. We’ll add more functionality for the success case
-in the next listing. The reason we might receive errors from the `incoming`
-method when a client connects to the server is that we’re not actually
-iterating over connections. Instead, we’re iterating over *connection
-attempts*. The connection might not be successful for a number of reasons, many
-of them operating system specific. For example, many operating systems have a
-limit to the number of simultaneous open connections they can support; new
-connection attempts beyond that number will produce an error until some of the
-open connections are closed.
-
-Let’s try running this code! Invoke `cargo run` in the terminal and then load
-*127.0.0.1:7878* in a web browser. The browser should show an error message
-like “Connection reset” because the server isn’t currently sending back any
-data. But when you look at your terminal, you should see several messages that
-were printed when the browser connected to the server!
-
-```
- Running `target/debug/hello`
-Connection established!
-Connection established!
-Connection established!
-```
-
-Sometimes you’ll see multiple messages printed for one browser request; the
-reason might be that the browser is making a request for the page as well as a
-request for other resources, like the *favicon.ico* icon that appears in the
-browser tab.
-
-It could also be that the browser is trying to connect to the server multiple
-times because the server isn’t responding with any data. When `stream` goes out
-of scope and is dropped at the end of the loop, the connection is closed as
-part of the `drop` implementation. Browsers sometimes deal with closed
-connections by retrying, because the problem might be temporary. The important
-factor is that we’ve successfully gotten a handle to a TCP connection!
-
-Remember to stop the program by pressing ctrl-C when you’re done running a
-particular version of the code. Then restart the program by invoking the `cargo
-run` command after you’ve made each set of code changes to make sure you’re
-running the newest code.
-
-### Reading the Request
-
-Let’s implement the functionality to read the request from the browser! To
-separate the concerns of first getting a connection and then taking some action
-with the connection, we’ll start a new function for processing connections. In
-this new `handle_connection` function, we’ll read data from the TCP stream and
-print it so we can see the data being sent from the browser. Change the code to
-look like Listing 20-2.
+Listing 19-3: Dereferencing raw pointers within an `unsafe` block
-Filename: src/main.rs
+Creating a pointer does no harm; it’s only when we try to access the value that
+it points at that we might end up dealing with an invalid value.
-```
-1 use std::{
- io::{prelude::*, BufReader},
- net::{TcpListener, TcpStream},
-};
+Note also that in Listings 19-1 and 19-3, we created `*const i32` and `*mut
+i32` raw pointers that both pointed to the same memory location, where `num` is
+stored. If we instead tried to create an immutable and a mutable reference to
+`num`, the code would not have compiled because Rust’s ownership rules don’t
+allow a mutable reference at the same time as any immutable references. With
+raw pointers, we can create a mutable pointer and an immutable pointer to the
+same location and change data through the mutable pointer, potentially creating
+a data race. Be careful!
-fn main() {
- let listener = TcpListener::bind("127.0.0.1:7878").unwrap();
+With all of these dangers, why would you ever use raw pointers? One major use
+case is when interfacing with C code, as you’ll see in “Calling an Unsafe
+Function or Method” on page XX. Another case is when building up safe
+abstractions that the borrow checker doesn’t understand. We’ll introduce unsafe
+functions and then look at an example of a safe abstraction that uses unsafe
+code.
- for stream in listener.incoming() {
- let stream = stream.unwrap();
+### Calling an Unsafe Function or Method
- 2 handle_connection(stream);
- }
-}
+The second type of operation you can perform in an unsafe block is calling
+unsafe functions. Unsafe functions and methods look exactly like regular
+functions and methods, but they have an extra `unsafe` before the rest of the
+definition. The `unsafe` keyword in this context indicates the function has
+requirements we need to uphold when we call this function, because Rust can’t
+guarantee we’ve met these requirements. By calling an unsafe function within an
+`unsafe` block, we’re saying that we’ve read this function’s documentation and
+we take responsibility for upholding the function’s contracts.
+
+Here is an unsafe function named `dangerous` that doesn’t do anything in its
+body:
-fn handle_connection(mut stream: TcpStream) {
- 3 let buf_reader = BufReader::new(&mut stream);
- 4 let http_request: Vec<_> = buf_reader
- 5 .lines()
- 6 .map(|result| result.unwrap())
- 7 .take_while(|line| !line.is_empty())
- .collect();
-
- 8 println!("Request: {:#?}", http_request);
-}
-```
-
-Listing 20-2: Reading from the `TcpStream` and printing the data
-
-We bring `std::io::prelude` and `std::io::BufReader` into scope to get access
-to traits and types that let us read from and write to the stream [1]. In the
-`for` loop in the `main` function, instead of printing a message that says we
-made a connection, we now call the new `handle_connection` function and pass
-the `stream` to it [2].
-
-In the `handle_connection` function, we create a new `BufReader` instance that
-wraps a mutable reference to the `stream` [3]. `BufReader` adds buffering by
-managing calls to the `std::io::Read` trait methods for us.
-
-We create a variable named `http_request` to collect the lines of the request
-the browser sends to our server. We indicate that we want to collect these
-lines in a vector by adding the `Vec<_>` type annotation [4].
-
-`BufReader` implements the `std::io::BufRead` trait, which provides the `lines`
-method [5]. The `lines` method returns an iterator of `Result<String,
-std::io::Error>` by splitting the stream of data whenever it sees a newline
-byte. To get each `String`, we map and `unwrap` each `Result` [6]. The `Result`
-might be an error if the data isn’t valid UTF-8 or if there was a problem
-reading from the stream. Again, a production program should handle these errors
-more gracefully, but we’re choosing to stop the program in the error case for
-simplicity.
+```
+unsafe fn dangerous() {}
-The browser signals the end of an HTTP request by sending two newline
-characters in a row, so to get one request from the stream, we take lines until
-we get a line that is the empty string [7]. Once we’ve collected the lines into
-the vector, we’re printing them out using pretty debug formatting [8] so we can
-take a look at the instructions the web browser is sending to our server.
+unsafe {
+ dangerous();
+}
+```
-Let’s try this code! Start the program and make a request in a web browser
-again. Note that we’ll still get an error page in the browser, but our
-program’s output in the terminal will now look similar to this:
+We must call the `dangerous` function within a separate `unsafe` block. If we
+try to call `dangerous` without the `unsafe` block, we’ll get an error:
```
-$ cargo run
- Compiling hello v0.1.0 (file:///projects/hello)
- Finished dev [unoptimized + debuginfo] target(s) in 0.42s
- Running `target/debug/hello`
-Request: [
- "GET / HTTP/1.1",
- "Host: 127.0.0.1:7878",
- "User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:99.0)
-Gecko/20100101 Firefox/99.0",
- "Accept:
-text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*
-;q=0.8",
- "Accept-Language: en-US,en;q=0.5",
- "Accept-Encoding: gzip, deflate, br",
- "DNT: 1",
- "Connection: keep-alive",
- "Upgrade-Insecure-Requests: 1",
- "Sec-Fetch-Dest: document",
- "Sec-Fetch-Mode: navigate",
- "Sec-Fetch-Site: none",
- "Sec-Fetch-User: ?1",
- "Cache-Control: max-age=0",
-]
+error[E0133]: call to unsafe function is unsafe and requires
+unsafe function or block
+ --> src/main.rs:4:5
+ |
+4 | dangerous();
+ | ^^^^^^^^^^^ call to unsafe function
+ |
+ = note: consult the function's documentation for information on
+how to avoid undefined behavior
```
-Depending on your browser, you might get slightly different output. Now that
-we’re printing the request data, we can see why we get multiple connections
-from one browser request by looking at the path after `GET` in the first line
-of the request. If the repeated connections are all requesting */*, we know the
-browser is trying to fetch */* repeatedly because it’s not getting a response
-from our program.
+With the `unsafe` block, we’re asserting to Rust that we’ve read the function’s
+documentation, we understand how to use it properly, and we’ve verified that
+we’re fulfilling the contract of the function.
-Let’s break down this request data to understand what the browser is asking of
-our program.
+Bodies of unsafe functions are effectively `unsafe` blocks, so to perform other
+unsafe operations within an unsafe function, we don’t need to add another
+`unsafe` block.
-### A Closer Look at an HTTP Request
+#### Creating a Safe Abstraction over Unsafe Code
-HTTP is a text-based protocol, and a request takes this format:
+Just because a function contains unsafe code doesn’t mean we need to mark the
+entire function as unsafe. In fact, wrapping unsafe code in a safe function is
+a common abstraction. As an example, let’s study the `split_at_mut` function
+from the standard library, which requires some unsafe code. We’ll explore how
+we might implement it. This safe method is defined on mutable slices: it takes
+one slice and makes it two by splitting the slice at the index given as an
+argument. Listing 19-4 shows how to use `split_at_mut`.
```
-Method Request-URI HTTP-Version CRLF
-headers CRLF
-message-body
-```
+let mut v = vec![1, 2, 3, 4, 5, 6];
-The first line is the *request line* that holds information about what the
-client is requesting. The first part of the request line indicates the *method*
-being used, such as `GET` or `POST`, which describes how the client is making
-this request. Our client used a `GET` request, which means it is asking for
-information.
+let r = &mut v[..];
-The next part of the request line is */*, which indicates the *uniform resource
-identifier* *(URI)* the client is requesting: a URI is almost, but not quite,
-the same as a *uniform resource locator* *(URL)*. The difference between URIs
-and URLs isn’t important for our purposes in this chapter, but the HTTP spec
-uses the term *URI*, so we can just mentally substitute *URL* for *URI* here.
+let (a, b) = r.split_at_mut(3);
-The last part is the HTTP version the client uses, and then the request line
-ends in a CRLF sequence. (CRLF stands for *carriage return* and *line feed*,
-which are terms from the typewriter days!) The CRLF sequence can also be
-written as `\r\n`, where `\r` is a carriage return and `\n` is a line feed. The
-*CRLF sequence* separates the request line from the rest of the request data.
-Note that when the CRLF is printed, we see a new line start rather than `\r\n`.
+assert_eq!(a, &mut [1, 2, 3]);
+assert_eq!(b, &mut [4, 5, 6]);
+```
-Looking at the request line data we received from running our program so far,
-we see that `GET` is the method, */* is the request URI, and `HTTP/1.1` is the
-version.
+Listing 19-4: Using the safe `split_at_mut` function
-After the request line, the remaining lines starting from `Host:` onward are
-headers. `GET` requests have no body.
+We can’t implement this function using only safe Rust. An attempt might look
+something like Listing 19-5, which won’t compile. For simplicity, we’ll
+implement `split_at_mut` as a function rather than a method and only for slices
+of `i32` values rather than for a generic type `T`.
-Try making a request from a different browser or asking for a different
-address, such as *127.0.0.1:7878/test*, to see how the request data changes.
+```
+fn split_at_mut(
+ values: &mut [i32],
+ mid: usize,
+) -> (&mut [i32], &mut [i32]) {
+ let len = values.len();
-Now that we know what the browser is asking for, let’s send back some data!
+ assert!(mid <= len);
-### Writing a Response
+ (&mut values[..mid], &mut values[mid..])
+}
+```
-We’re going to implement sending data in response to a client request.
-Responses have the following format:
+Listing 19-5: An attempted implementation of `split_at_mut` using only safe Rust
-```
-HTTP-Version Status-Code Reason-Phrase CRLF
-headers CRLF
-message-body
-```
+This function first gets the total length of the slice. Then it asserts that
+the index given as a parameter is within the slice by checking whether it’s
+less than or equal to the length. The assertion means that if we pass an index
+that is greater than the length to split the slice at, the function will panic
+before it attempts to use that index.
-The first line is a *status line* that contains the HTTP version used in the
-response, a numeric status code that summarizes the result of the request, and
-a reason phrase that provides a text description of the status code. After the
-CRLF sequence are any headers, another CRLF sequence, and the body of the
-response.
+Then we return two mutable slices in a tuple: one from the start of the
+original slice to the `mid` index and another from `mid` to the end of the
+slice.
-Here is an example response that uses HTTP version 1.1, and has a status code
-of 200, an OK reason phrase, no headers, and no body:
+When we try to compile the code in Listing 19-5, we’ll get an error:
```
-HTTP/1.1 200 OK\r\n\r\n
+error[E0499]: cannot borrow `*values` as mutable more than once at a time
+ --> src/main.rs:9:31
+ |
+2 | values: &mut [i32],
+ | - let's call the lifetime of this reference `'1`
+...
+9 | (&mut values[..mid], &mut values[mid..])
+ | --------------------------^^^^^^--------
+ | | | |
+ | | | second mutable borrow occurs here
+ | | first mutable borrow occurs here
+ | returning this value requires that `*values` is borrowed for `'1`
```
-The status code 200 is the standard success response. The text is a tiny
-successful HTTP response. Let’s write this to the stream as our response to a
-successful request! From the `handle_connection` function, remove the
-`println!` that was printing the request data and replace it with the code in
-Listing 20-3.
+Rust’s borrow checker can’t understand that we’re borrowing different parts of
+the slice; it only knows that we’re borrowing from the same slice twice.
+Borrowing different parts of a slice is fundamentally okay because the two
+slices aren’t overlapping, but Rust isn’t smart enough to know this. When we
+know code is okay, but Rust doesn’t, it’s time to reach for unsafe code.
-Filename: src/main.rs
+Listing 19-6 shows how to use an `unsafe` block, a raw pointer, and some calls
+to unsafe functions to make the implementation of `split_at_mut` work.
```
-fn handle_connection(mut stream: TcpStream) {
- let buf_reader = BufReader::new(&mut stream);
- let http_request: Vec<_> = buf_reader
- .lines()
- .map(|result| result.unwrap())
- .take_while(|line| !line.is_empty())
- .collect();
+use std::slice;
+
+fn split_at_mut(
+ values: &mut [i32],
+ mid: usize,
+) -> (&mut [i32], &mut [i32]) {
+ 1 let len = values.len();
+ 2 let ptr = values.as_mut_ptr();
- 1 let response = "HTTP/1.1 200 OK\r\n\r\n";
+ 3 assert!(mid <= len);
- 2 stream.write_all(response.3 as_bytes()).unwrap();
+ 4 unsafe {
+ (
+ 5 slice::from_raw_parts_mut(ptr, mid),
+ 6 slice::from_raw_parts_mut(ptr.add(mid), len - mid),
+ )
+ }
}
```
-Listing 20-3: Writing a tiny successful HTTP response to the stream
+Listing 19-6: Using unsafe code in the implementation of the `split_at_mut`
+function
+
+Recall from “The Slice Type” on page XX that a slice is a pointer to some data
+and the length of the slice. We use the `len` method to get the length of a
+slice [1] and the `as_mut_ptr` method to access the raw pointer of a slice [2].
+In this case, because we have a mutable slice to `i32` values, `as_mut_ptr`
+returns a raw pointer with the type `*mut i32`, which we’ve stored in the
+variable `ptr`.
+
+We keep the assertion that the `mid` index is within the slice [3]. Then we get
+to the unsafe code [4]: the `slice::from_raw_parts_mut` function takes a raw
+pointer and a length, and it creates a slice. We use it to create a slice that
+starts from `ptr` and is `mid` items long [5]. Then we call the `add` method on
+`ptr` with `mid` as an argument to get a raw pointer that starts at `mid`, and
+we create a slice using that pointer and the remaining number of items after
+`mid` as the length [6].
+
+The function `slice::from_raw_parts_mut` is unsafe because it takes a raw
+pointer and must trust that this pointer is valid. The `add` method on raw
+pointers is also unsafe because it must trust that the offset location is also
+a valid pointer. Therefore, we had to put an `unsafe` block around our calls to
+`slice::from_raw_parts_mut` and `add` so we could call them. By looking at the
+code and by adding the assertion that `mid` must be less than or equal to
+`len`, we can tell that all the raw pointers used within the `unsafe` block
+will be valid pointers to data within the slice. This is an acceptable and
+appropriate use of `unsafe`.
+
+Note that we don’t need to mark the resultant `split_at_mut` function as
+`unsafe`, and we can call this function from safe Rust. We’ve created a safe
+abstraction to the unsafe code with an implementation of the function that uses
+`unsafe` code in a safe way, because it creates only valid pointers from the
+data this function has access to.
+
+In contrast, the use of `slice::from_raw_parts_mut` in Listing 19-7 would
+likely crash when the slice is used. This code takes an arbitrary memory
+location and creates a slice 10,000 items long.
+
+```
+use std::slice;
+
+let address = 0x01234usize;
+let r = address as *mut i32;
+
+let values: &[i32] = unsafe {
+ slice::from_raw_parts_mut(r, 10000)
+};
+```
-The first new line defines the `response` variable that holds the success
-message’s data [1]. Then we call `as_bytes` on our `response` to convert the
-string data to bytes [3]. The `write_all` method on `stream` takes a `&[u8]`
-and sends those bytes directly down the connection [2]. Because the `write_all`
-operation could fail, we use `unwrap` on any error result as before. Again, in
-a real application you would add error handling here.
+Listing 19-7: Creating a slice from an arbitrary memory location
-With these changes, let’s run our code and make a request. We’re no longer
-printing any data to the terminal, so we won’t see any output other than the
-output from Cargo. When you load *127.0.0.1:7878* in a web browser, you should
-get a blank page instead of an error. You’ve just handcoded receiving an HTTP
-request and sending a response!
+We don’t own the memory at this arbitrary location, and there is no guarantee
+that the slice this code creates contains valid `i32` values. Attempting to use
+`values` as though it’s a valid slice results in undefined behavior.
-### Returning Real HTML
+#### Using extern Functions to Call External Code
-Let’s implement the functionality for returning more than a blank page. Create
-the new file *hello.html* in the root of your project directory, not in the
-*src* directory. You can input any HTML you want; Listing 20-4 shows one
-possibility.
+Sometimes your Rust code might need to interact with code written in another
+language. For this, Rust has the keyword `extern` that facilitates the creation
+and use of a *Foreign Function Interface* *(FFI)*, which is a way for a
+programming language to define functions and enable a different (foreign)
+programming language to call those functions.
-Filename: hello.html
+Listing 19-8 demonstrates how to set up an integration with the `abs` function
+from the C standard library. Functions declared within `extern` blocks are
+always unsafe to call from Rust code. The reason is that other languages don’t
+enforce Rust’s rules and guarantees, and Rust can’t check them, so
+responsibility falls on the programmer to ensure safety.
+
+Filename: src/main.rs
```
-<!DOCTYPE html>
-<html lang="en">
- <head>
- <meta charset="utf-8">
- <title>Hello!
-
-
- Hello!
- Hi from Rust
-
-