bevy/examples/reflection/generic_reflection.rs
bjorn3 6d6bc2a8b4 Merge AppBuilder into App (#2531)
This is extracted out of eb8f973646476b4a4926ba644a77e2b3a5772159 and includes some additional changes to remove all references to AppBuilder and fix examples that still used App::build() instead of App::new(). In addition I didn't extract the sub app feature as it isn't ready yet.

You can use `git diff --diff-filter=M eb8f973646476b4a4926ba644a77e2b3a5772159` to find all differences in this PR. The `--diff-filtered=M` filters all files added in the original commit but not in this commit away.

Co-Authored-By: Carter Anderson <mcanders1@gmail.com>
2021-07-27 20:21:06 +00:00

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Rust

use bevy::{prelude::*, reflect::TypeRegistry};
use std::any::TypeId;
/// You must manually register each instance of a generic type
fn main() {
App::new()
.add_plugins(DefaultPlugins)
.register_type::<MyType<u32>>()
.add_startup_system(setup.system())
.run();
}
#[derive(Reflect)]
struct MyType<T: Reflect> {
value: T,
}
fn setup(type_registry: Res<TypeRegistry>) {
let type_registry = type_registry.read();
let registration = type_registry.get(TypeId::of::<MyType<u32>>()).unwrap();
info!("Registration for {} exists", registration.short_name());
// MyType<String> was not manually registered, so it does not exist
assert!(type_registry.get(TypeId::of::<MyType<String>>()).is_none());
}