Allow `noexcept` methods in a composable hierarchy (#3262)

crates/libs/bindgen/src/rust/winrt_methods.rs

@@ -148,10 +148,16 @@ pub fn writer(
         metadata::InterfaceKind::None
         | metadata::InterfaceKind::Base
         | metadata::InterfaceKind::Overridable => {
+            let unwrap = if noexcept {
+                quote! { .unwrap() }
+            } else {
+                quote! { ? }
+            };
+
             quote! {
                 #features
                 pub fn #name<#generics>(&self, #params) #return_type_tokens #where_clause {
-                    let this = &windows_core::Interface::cast::<#interface_name>(self)?;
+                    let this = &windows_core::Interface::cast::<#interface_name>(self)#unwrap;
                     unsafe {
                         #vcall
                     }

crates/tests/winrt/composable/src/bindings.rs

@@ -172,15 +172,16 @@ windows_core::imp::interface_hierarchy!(
 );
 windows_core::imp::required_hierarchy!(ContainerVisual, Visual);
 impl ContainerVisual {
-    pub fn Children(&self) -> windows_core::Result<i32> {
+    pub fn Children(&self) -> i32 {
         let this = self;
         unsafe {
             let mut result__ = core::mem::zeroed();
-            (windows_core::Interface::vtable(this).Children)(
+            let hresult__ = (windows_core::Interface::vtable(this).Children)(
                 windows_core::Interface::as_raw(this),
                 &mut result__,
-            )
-            .map(|| result__)
+            );
+            debug_assert!(hresult__.0 == 0);
+            result__
         }
     }
     pub fn Compositor(&self) -> windows_core::Result<Compositor> {
@@ -218,26 +219,28 @@ windows_core::imp::interface_hierarchy!(
 );
 windows_core::imp::required_hierarchy!(SpriteVisual, ContainerVisual, Visual);
 impl SpriteVisual {
-    pub fn Children(&self) -> windows_core::Result<i32> {
-        let this = &windows_core::Interface::cast::<IContainerVisual>(self)?;
+    pub fn Children(&self) -> i32 {
+        let this = &windows_core::Interface::cast::<IContainerVisual>(self).unwrap();
         unsafe {
             let mut result__ = core::mem::zeroed();
-            (windows_core::Interface::vtable(this).Children)(
+            let hresult__ = (windows_core::Interface::vtable(this).Children)(
                 windows_core::Interface::as_raw(this),
                 &mut result__,
-            )
-            .map(|| result__)
+            );
+            debug_assert!(hresult__.0 == 0);
+            result__
         }
     }
-    pub fn Brush(&self) -> windows_core::Result<i32> {
+    pub fn Brush(&self) -> i32 {
         let this = self;
         unsafe {
             let mut result__ = core::mem::zeroed();
-            (windows_core::Interface::vtable(this).Brush)(
+            let hresult__ = (windows_core::Interface::vtable(this).Brush)(
                 windows_core::Interface::as_raw(this),
                 &mut result__,
-            )
-            .map(|| result__)
+            );
+            debug_assert!(hresult__.0 == 0);
+            result__
         }
     }
     pub fn Compositor(&self) -> windows_core::Result<Compositor> {
@@ -351,7 +354,7 @@ impl ICompositor_Vtbl {
     }
 }
 pub trait IContainerVisual_Impl: Sized + windows_core::IUnknownImpl {
-    fn Children(&self) -> windows_core::Result<i32>;
+    fn Children(&self) -> i32;
 }
 impl windows_core::RuntimeName for IContainerVisual {
     const NAME: &'static str = "test_composable.IContainerVisual";
@@ -364,13 +367,9 @@ impl IContainerVisual_Vtbl {
             result__: *mut i32,
         ) -> windows_core::HRESULT {
             let this: &Identity = &*((this as *const *const ()).offset(OFFSET) as *const Identity);
-            match IContainerVisual_Impl::Children(this) {
-                Ok(ok__) => {
-                    result__.write(core::mem::transmute_copy(&ok__));
-                    windows_core::HRESULT(0)
-                }
-                Err(err) => err.into(),
-            }
+            let ok__ = IContainerVisual_Impl::Children(this);
+            result__.write(core::mem::transmute_copy(&ok__));
+            windows_core::HRESULT(0)
         }
         Self {
             base__: windows_core::IInspectable_Vtbl::new::<Identity, IContainerVisual, OFFSET>(),
@@ -398,7 +397,7 @@ impl IContainerVisualFactory_Vtbl {
     }
 }
 pub trait ISpriteVisual_Impl: Sized + windows_core::IUnknownImpl {
-    fn Brush(&self) -> windows_core::Result<i32>;
+    fn Brush(&self) -> i32;
 }
 impl windows_core::RuntimeName for ISpriteVisual {
     const NAME: &'static str = "test_composable.ISpriteVisual";
@@ -410,13 +409,9 @@ impl ISpriteVisual_Vtbl {
             result__: *mut i32,
         ) -> windows_core::HRESULT {
             let this: &Identity = &*((this as *const *const ()).offset(OFFSET) as *const Identity);
-            match ISpriteVisual_Impl::Brush(this) {
-                Ok(ok__) => {
-                    result__.write(core::mem::transmute_copy(&ok__));
-                    windows_core::HRESULT(0)
-                }
-                Err(err) => err.into(),
-            }
+            let ok__ = ISpriteVisual_Impl::Brush(this);
+            result__.write(core::mem::transmute_copy(&ok__));
+            windows_core::HRESULT(0)
         }
         Self {
             base__: windows_core::IInspectable_Vtbl::new::<Identity, ISpriteVisual, OFFSET>(),

crates/tests/winrt/composable/src/lib.rs

@@ -51,8 +51,8 @@ impl ContainerVisual {
 }
 
 impl bindings::IContainerVisual_Impl for ContainerVisual_Impl {
-    fn Children(&self) -> Result<i32> {
-        Ok(self.children)
+    fn Children(&self) -> i32 {
+        self.children
     }
 }
 
@@ -75,14 +75,14 @@ impl SpriteVisual {
 }
 
 impl bindings::ISpriteVisual_Impl for SpriteVisual_Impl {
-    fn Brush(&self) -> Result<i32> {
-        Ok(self.brush)
+    fn Brush(&self) -> i32 {
+        self.brush
     }
 }
 
 impl bindings::IContainerVisual_Impl for SpriteVisual_Impl {
-    fn Children(&self) -> Result<i32> {
-        Ok(self.container.children)
+    fn Children(&self) -> i32 {
+        self.container.children
     }
 }
 

crates/tests/winrt/composable/src/metadata.idl

@@ -20,11 +20,11 @@ namespace test_composable
 
     unsealed runtimeclass ContainerVisual : Visual
     {
-        Int32 Children {get;};
+        [noexcept] Int32 Children {get;};
     }
 
     runtimeclass SpriteVisual : ContainerVisual
     {
-        Int32 Brush {get;};
+        [noexcept] Int32 Brush {get;};
     }
 }

crates/tests/winrt/composable_client/src/bindings.rs

@@ -172,15 +172,16 @@ windows_core::imp::interface_hierarchy!(
 );
 windows_core::imp::required_hierarchy!(ContainerVisual, Visual);
 impl ContainerVisual {
-    pub fn Children(&self) -> windows_core::Result<i32> {
+    pub fn Children(&self) -> i32 {
         let this = self;
         unsafe {
             let mut result__ = core::mem::zeroed();
-            (windows_core::Interface::vtable(this).Children)(
+            let hresult__ = (windows_core::Interface::vtable(this).Children)(
                 windows_core::Interface::as_raw(this),
                 &mut result__,
-            )
-            .map(|| result__)
+            );
+            debug_assert!(hresult__.0 == 0);
+            result__
         }
     }
     pub fn Compositor(&self) -> windows_core::Result<Compositor> {
@@ -218,26 +219,28 @@ windows_core::imp::interface_hierarchy!(
 );
 windows_core::imp::required_hierarchy!(SpriteVisual, ContainerVisual, Visual);
 impl SpriteVisual {
-    pub fn Children(&self) -> windows_core::Result<i32> {
-        let this = &windows_core::Interface::cast::<IContainerVisual>(self)?;
+    pub fn Children(&self) -> i32 {
+        let this = &windows_core::Interface::cast::<IContainerVisual>(self).unwrap();
         unsafe {
             let mut result__ = core::mem::zeroed();
-            (windows_core::Interface::vtable(this).Children)(
+            let hresult__ = (windows_core::Interface::vtable(this).Children)(
                 windows_core::Interface::as_raw(this),
                 &mut result__,
-            )
-            .map(|| result__)
+            );
+            debug_assert!(hresult__.0 == 0);
+            result__
         }
     }
-    pub fn Brush(&self) -> windows_core::Result<i32> {
+    pub fn Brush(&self) -> i32 {
         let this = self;
         unsafe {
             let mut result__ = core::mem::zeroed();
-            (windows_core::Interface::vtable(this).Brush)(
+            let hresult__ = (windows_core::Interface::vtable(this).Brush)(
                 windows_core::Interface::as_raw(this),
                 &mut result__,
-            )
-            .map(|| result__)
+            );
+            debug_assert!(hresult__.0 == 0);
+            result__
         }
     }
     pub fn Compositor(&self) -> windows_core::Result<Compositor> {

crates/tests/winrt/composable_client/src/lib.rs

@@ -16,12 +16,12 @@ fn test() -> Result<()> {
     let compositor = Compositor::new()?;
 
     let container = compositor.CreateContainerVisual(123)?;
-    assert_eq!(container.Children()?, 123);
+    assert_eq!(container.Children(), 123);
     assert_eq!(container.Compositor()?, compositor);
 
     let sprite = compositor.CreateSpriteVisual(456)?;
-    assert_eq!(sprite.Brush()?, 456);
-    assert_eq!(sprite.Children()?, 456 * 2);
+    assert_eq!(sprite.Brush(), 456);
+    assert_eq!(sprite.Children(), 456 * 2);
     assert_eq!(sprite.Compositor()?, compositor);
 
     Ok(())