update docs

crates/libs/core/src/com_object.rs

@@ -206,20 +206,18 @@ impl<T: ComObjectInner> ComObject<T> {
     /// returned `&dyn Any` refers to the _outer_ implementation object that was generated by
     /// `#[implement]`, i.e. the `MyApp_Impl` type, not the inner `MyApp` type.
     ///
-    /// If the given object is not a Rust object, or is a Rust object but not `T`, then this
-    /// function will return `Err(E_NOINTERFACE)`.
+    /// If the given object is not a Rust object, or is a Rust object but not `T`, or is a Rust
+    /// object that contains non-static lifetimes, then this function will return `Err(E_NOINTERFACE)`.
     ///
     /// The returned value is an owned (counted) reference; this function calls `AddRef` on the
     /// underlying COM object. If you do not need an owned reference, then you can use the
     /// [`Interface::cast_object_ref`] method instead, and avoid the cost of `AddRef` / `Release`.
-    pub fn cast_from<IR, I>(self, interface: IR) -> crate::Result<Self>
+    pub fn cast_from<I>(interface: &I) -> crate::Result<Self>
     where
-        IR: AsRef<I>,
         I: Interface,
         T::Outer: Any + 'static + IUnknownImpl<Impl = T>,
     {
-        let interface_ref: &I = interface.as_ref();
-        interface_ref.cast_object()
+        interface.cast_object()
     }
 }
 

crates/libs/core/src/interface.rs

@@ -121,8 +121,8 @@ pub unsafe trait Interface: Sized + Clone {
     /// returned `&dyn Any` refers to the _outer_ implementation object that was generated by
     /// `#[implement]`, i.e. the `MyApp_Impl` type, not the inner `MyApp` type.
     ///
-    /// If the given object is not a Rust object, or is a Rust object but not `T`, then this
-    /// function will return `Err(E_NOINTERFACE)`.
+    /// If the given object is not a Rust object, or is a Rust object but not `T`, or is a Rust
+    /// object that contains non-static lifetimes, then this function will return `Err(E_NOINTERFACE)`.
     ///
     /// # Safety
     ///
@@ -162,8 +162,8 @@ pub unsafe trait Interface: Sized + Clone {
     /// `T` must be a type that has been annotated with `#[implement]`; this is checked at
     /// compile-time by the generic constraints of this method.
     ///
-    /// If the given object is not a Rust object, or is a Rust object but not `T`, then this
-    /// function will return `false`.
+    /// If the given object is not a Rust object, or is a Rust object but not `T`, or is a Rust
+    /// object that contains non-static lifetimes, then this function will return `false`.
     #[inline(always)]
     fn is_object<T>(&self) -> bool
     where
@@ -185,8 +185,8 @@ pub unsafe trait Interface: Sized + Clone {
     /// returned `&dyn Any` refers to the _outer_ implementation object that was generated by
     /// `#[implement]`, i.e. the `MyApp_Impl` type, not the inner `MyApp` type.
     ///
-    /// If the given object is not a Rust object, or is a Rust object but not `T`, then this
-    /// function will return `Err(E_NOINTERFACE)`.
+    /// If the given object is not a Rust object, or is a Rust object but not `T`, or is a Rust
+    /// object that contains non-static lifetimes, then this function will return `Err(E_NOINTERFACE)`.
     ///
     /// The returned value is borrowed. If you need an owned (counted) reference, then use
     /// [`Interface::cast_object`].
@@ -212,8 +212,8 @@ pub unsafe trait Interface: Sized + Clone {
     /// returned `&dyn Any` refers to the _outer_ implementation object that was generated by
     /// `#[implement]`, i.e. the `MyApp_Impl` type, not the inner `MyApp` type.
     ///
-    /// If the given object is not a Rust object, or is a Rust object but not `T`, then this
-    /// function will return `Err(E_NOINTERFACE)`.
+    /// If the given object is not a Rust object, or is a Rust object but not `T`, or is a Rust
+    /// object that contains non-static lifetimes, then this function will return `Err(E_NOINTERFACE)`.
     ///
     /// The returned value is an owned (counted) reference; this function calls `AddRef` on the
     /// underlying COM object. If you do not need an owned reference, then you can use the

crates/tests/implement_core/src/com_object.rs

@@ -371,6 +371,9 @@ fn dynamic_cast() {
 
     let dyn_app_owned: ComObject<MyApp> = unknown.cast_object().unwrap();
     assert_eq!(dyn_app_owned.signature, APP_SIGNATURE);
+
+    let dyn_app_owned_2: ComObject<MyApp> = ComObject::cast_from(&unknown).unwrap();
+    assert_eq!(dyn_app_owned_2.signature, APP_SIGNATURE);
 }
 
 // This tests that we can place a type that is not Send in a ComObject.