examples: cfg so we do not generate exceptions for wasm

examples/qml_features/rust/src/invokables.rs

@@ -45,7 +45,14 @@ pub mod qobject {
         /// Immutable invokable method that returns the QColor
         #[qinvokable]
         #[cxx_name = "loadColor"]
-        fn load_color(self: &RustInvokables) -> Result<QColor>;
+        #[cfg(not(target_family = "wasm"))]
+        fn load_color_result(self: &RustInvokables) -> Result<QColor>;
+
+        /// Immutable invokable method that returns the QColor
+        #[qinvokable]
+        #[cxx_name = "loadColor"]
+        #[cfg(target_family = "wasm")]
+        fn load_color(self: &RustInvokables) -> QColor;
 
         /// Mutable invokable method that stores a color
         #[qinvokable]
@@ -96,7 +103,14 @@ impl Default for RustInvokablesRust {
 // ANCHOR: book_invokable_impl
 impl qobject::RustInvokables {
     /// Immutable invokable method that returns the QColor
-    pub fn load_color(&self) -> Result<QColor, i32> {
+    #[cfg(target_family = "wasm")]
+    pub fn load_color(&self) -> QColor {
+        self.as_qcolor()
+    }
+
+    /// Immutable invokable method that returns the QColor
+    #[cfg(not(target_family = "wasm"))]
+    pub fn load_color_result(&self) -> Result<QColor, i32> {
         Ok(self.as_qcolor())
     }
 

tests/basic_cxx_qt/cpp/main.cpp

@@ -202,6 +202,7 @@ private Q_SLOTS:
   // Tests that we can build an empty QObject end to end
   void testEmpty() { Empty empty; }
 
+#ifndef RUST_CXX_NO_EXCEPTION
   void testThrowException()
   {
     cxx_qt::my_object::MyObject obj;
@@ -216,6 +217,7 @@ private Q_SLOTS:
 
     QCOMPARE(thrown, true);
   }
+#endif
 };
 
 QTEST_MAIN(CxxQtTest)

tests/basic_cxx_qt/rust/src/lib.rs

@@ -47,6 +47,7 @@ mod qobject {
         #[cxx_name = "fetchUpdateCallCount"]
         fn fetch_update_call_count(self: &MyObject) -> i32;
 
+        #[cfg(not(target_family = "wasm"))]
         #[cxx_name = "throwException"]
         fn throw_exception(self: &MyObject) -> Result<i32>;
     }
@@ -129,6 +130,7 @@ impl qobject::MyObject {
         self.update_call_count
     }
 
+    #[cfg(not(target_family = "wasm"))]
     fn throw_exception(&self) -> Result<i32, String> {
         Err("RustException".to_string())
     }