Vendor dependencies for 0.3.0 release

vendor/bevy/examples/reflection/generic_reflection.rs

@@ -0,0 +1,33 @@
+//! Demonstrates how reflection is used with generic Rust types.
+
+use bevy::prelude::*;
+use std::any::TypeId;
+
+fn main() {
+    App::new()
+        .add_plugins(DefaultPlugins)
+        // You must manually register each instance of a generic type
+        .register_type::<MyType<u32>>()
+        .add_systems(Startup, setup)
+        .run();
+}
+
+/// The `#[derive(Reflect)]` macro will automatically add any required bounds to `T`,
+/// such as `Reflect` and `GetTypeRegistration`.
+#[derive(Reflect)]
+struct MyType<T> {
+    value: T,
+}
+
+fn setup(type_registry: Res<AppTypeRegistry>) {
+    let type_registry = type_registry.read();
+
+    let registration = type_registry.get(TypeId::of::<MyType<u32>>()).unwrap();
+    info!(
+        "Registration for {} exists",
+        registration.type_info().type_path(),
+    );
+
+    // MyType<String> was not manually registered, so it does not exist
+    assert!(type_registry.get(TypeId::of::<MyType<String>>()).is_none());
+}