Merge pull request #847 from godot-rust/qol/object-arg-mut-refs

`AsObjectArg<T>` is now implemented for `&mut Gd<T>`

godot-core/src/obj/object_arg.rs

@@ -67,6 +67,22 @@ where
     }
 }
 
+impl<T, U> AsObjectArg<T> for &mut Gd<U>
+where
+    T: GodotClass + Bounds<Declarer = bounds::DeclEngine>,
+    U: Inherits<T>,
+{
+    // Delegate to &Gd impl.
+
+    fn as_object_arg(&self) -> ObjectArg<T> {
+        <&Gd<U>>::as_object_arg(&&**self)
+    }
+
+    fn consume_object(self) -> ObjectCow<T> {
+        <&Gd<U>>::consume_object(&*self)
+    }
+}
+
 impl<T, U> AsObjectArg<T> for Option<U>
 where
     T: GodotClass + Bounds<Declarer = bounds::DeclEngine>,

itest/rust/src/object_tests/object_arg_test.rs

@@ -33,6 +33,16 @@ fn object_arg_borrowed() {
     });
 }
 
+#[itest]
+fn object_arg_borrowed_mut() {
+    with_objects(|mut manual, mut refc| {
+        let db = ClassDb::singleton();
+        let a = db.class_set_property(&mut manual, "name".into(), Variant::from("hello"));
+        let b = db.class_set_property(&mut refc, "value".into(), Variant::from(-123));
+        (a, b)
+    });
+}
+
 #[itest]
 fn object_arg_option_owned() {
     with_objects(|manual, refc| {
@@ -53,6 +63,16 @@ fn object_arg_option_borrowed() {
     });
 }
 
+#[itest]
+fn object_arg_option_borrowed_mut() {
+    with_objects(|mut manual, mut refc| {
+        let db = ClassDb::singleton();
+        let a = db.class_set_property(Some(&mut manual), "name".into(), Variant::from("hello"));
+        let b = db.class_set_property(Some(&mut refc), "value".into(), Variant::from(-123));
+        (a, b)
+    });
+}
+
 #[itest]
 fn object_arg_option_none() {
     let manual: Option<Gd<Node>> = None;