From 4563e803633d44ec57dfc4515f0c42c8855c018b Mon Sep 17 00:00:00 2001
From: Graham Bennett <graham@grahambennett.org>
Date: Sat, 22 Oct 2022 14:25:35 +0100
Subject: [PATCH] Fix C++20 warnings

---
 src/libstore/binary-cache-store.cc |  2 +-
 src/libstore/build/worker.cc       |  2 +-
 src/libstore/globals.cc            |  6 +++---
 src/libutil/args.cc                |  2 +-
 src/libutil/config.cc              |  8 ++++----
 src/libutil/config.hh              | 12 ++++++++----
 6 files changed, 18 insertions(+), 14 deletions(-)

diff --git a/src/libstore/binary-cache-store.cc b/src/libstore/binary-cache-store.cc
index a26770c7921..9ab941075f3 100644
--- a/src/libstore/binary-cache-store.cc
+++ b/src/libstore/binary-cache-store.cc
@@ -378,7 +378,7 @@ void BinaryCacheStore::queryPathInfoUncached(const StorePath & storePath,
     auto callbackPtr = std::make_shared<decltype(callback)>(std::move(callback));
 
     getFile(narInfoFile,
-        {[=](std::future<std::optional<std::string>> fut) {
+        {[=,this](std::future<std::optional<std::string>> fut) {
             try {
                 auto data = fut.get();
 
diff --git a/src/libstore/build/worker.cc b/src/libstore/build/worker.cc
index b192fbc778d..75406bec9e9 100644
--- a/src/libstore/build/worker.cc
+++ b/src/libstore/build/worker.cc
@@ -276,7 +276,7 @@ void Worker::run(const Goals & _topGoals)
         if (!children.empty() || !waitingForAWhile.empty())
             waitForInput();
         else {
-            if (awake.empty() && 0 == settings.maxBuildJobs)
+            if (awake.empty() && 0U == settings.maxBuildJobs)
             {
                 if (getMachines().empty())
                    throw Error("unable to start any build; either increase '--max-jobs' "
diff --git a/src/libstore/globals.cc b/src/libstore/globals.cc
index ff658c42879..c264014bea1 100644
--- a/src/libstore/globals.cc
+++ b/src/libstore/globals.cc
@@ -218,19 +218,19 @@ template<> void BaseSetting<SandboxMode>::convertToArg(Args & args, const std::s
         .longName = name,
         .description = "Enable sandboxing.",
         .category = category,
-        .handler = {[=]() { override(smEnabled); }}
+        .handler = {[this]() { override(smEnabled); }}
     });
     args.addFlag({
         .longName = "no-" + name,
         .description = "Disable sandboxing.",
         .category = category,
-        .handler = {[=]() { override(smDisabled); }}
+        .handler = {[this]() { override(smDisabled); }}
     });
     args.addFlag({
         .longName = "relaxed-" + name,
         .description = "Enable sandboxing, but allow builds to disable it.",
         .category = category,
-        .handler = {[=]() { override(smRelaxed); }}
+        .handler = {[this]() { override(smRelaxed); }}
     });
 }
 
diff --git a/src/libutil/args.cc b/src/libutil/args.cc
index 753980fd4ba..2930913d618 100644
--- a/src/libutil/args.cc
+++ b/src/libutil/args.cc
@@ -324,7 +324,7 @@ MultiCommand::MultiCommand(const Commands & commands_)
     expectArgs({
         .label = "subcommand",
         .optional = true,
-        .handler = {[=](std::string s) {
+        .handler = {[=,this](std::string s) {
             assert(!command);
             auto i = commands.find(s);
             if (i == commands.end()) {
diff --git a/src/libutil/config.cc b/src/libutil/config.cc
index 9bb412b4f5e..b349f2d80ed 100644
--- a/src/libutil/config.cc
+++ b/src/libutil/config.cc
@@ -209,7 +209,7 @@ void BaseSetting<T>::convertToArg(Args & args, const std::string & category)
         .description = fmt("Set the `%s` setting.", name),
         .category = category,
         .labels = {"value"},
-        .handler = {[=](std::string s) { overridden = true; set(s); }},
+        .handler = {[this](std::string s) { overridden = true; set(s); }},
     });
 
     if (isAppendable())
@@ -218,7 +218,7 @@ void BaseSetting<T>::convertToArg(Args & args, const std::string & category)
             .description = fmt("Append to the `%s` setting.", name),
             .category = category,
             .labels = {"value"},
-            .handler = {[=](std::string s) { overridden = true; set(s, true); }},
+            .handler = {[this](std::string s) { overridden = true; set(s, true); }},
         });
 }
 
@@ -270,13 +270,13 @@ template<> void BaseSetting<bool>::convertToArg(Args & args, const std::string &
         .longName = name,
         .description = fmt("Enable the `%s` setting.", name),
         .category = category,
-        .handler = {[=]() { override(true); }}
+        .handler = {[this]() { override(true); }}
     });
     args.addFlag({
         .longName = "no-" + name,
         .description = fmt("Disable the `%s` setting.", name),
         .category = category,
-        .handler = {[=]() { override(false); }}
+        .handler = {[this]() { override(false); }}
     });
 }
 
diff --git a/src/libutil/config.hh b/src/libutil/config.hh
index 79ec0f9cf36..7ac43c85475 100644
--- a/src/libutil/config.hh
+++ b/src/libutil/config.hh
@@ -250,11 +250,15 @@ public:
     operator const T &() const { return value; }
     operator T &() { return value; }
     const T & get() const { return value; }
-    bool operator ==(const T & v2) const { return value == v2; }
-    bool operator !=(const T & v2) const { return value != v2; }
-    void operator =(const T & v) { assign(v); }
+    template<typename U>
+    bool operator ==(const U & v2) const { return value == v2; }
+    template<typename U>
+    bool operator !=(const U & v2) const { return value != v2; }
+    template<typename U>
+    void operator =(const U & v) { assign(v); }
     virtual void assign(const T & v) { value = v; }
-    void setDefault(const T & v) { if (!overridden) value = v; }
+    template<typename U>
+    void setDefault(const U & v) { if (!overridden) value = v; }
 
     void set(const std::string & str, bool append = false) override;