mirror of https://github.com/rust-lang/rust
119 lines
2.1 KiB
Rust
119 lines
2.1 KiB
Rust
//@ revisions:cfail1 cfail2
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//@[cfail1] compile-flags: --crate-type=lib --edition=2021 -Zassert-incr-state=not-loaded
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//@[cfail2] compile-flags: --crate-type=lib --edition=2021 -Zassert-incr-state=loaded
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//@ build-pass
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use core::any::Any;
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use core::marker::PhantomData;
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struct DerefWrap<T>(T);
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impl<T> core::ops::Deref for DerefWrap<T> {
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type Target = T;
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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struct Storage<T, D> {
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phantom: PhantomData<(T, D)>,
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}
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type ReadStorage<T> = Storage<T, DerefWrap<MaskedStorage<T>>>;
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pub trait Component {
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type Storage;
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}
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struct VecStorage;
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struct Pos;
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impl Component for Pos {
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type Storage = VecStorage;
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}
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struct GenericComp<T> {
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_t: T,
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}
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impl<T: 'static> Component for GenericComp<T> {
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type Storage = VecStorage;
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}
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struct ReadData {
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pos_interpdata: ReadStorage<GenericComp<Pos>>,
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}
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trait System {
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type SystemData;
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fn run(data: Self::SystemData, any: Box<dyn Any>);
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}
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struct Sys;
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impl System for Sys {
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type SystemData = (ReadData, ReadStorage<Pos>);
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fn run((data, pos): Self::SystemData, any: Box<dyn Any>) {
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<ReadStorage<GenericComp<Pos>> as SystemData>::setup(any);
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ParJoin::par_join((&pos, &data.pos_interpdata));
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}
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}
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trait ParJoin {
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fn par_join(self)
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where
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Self: Sized,
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{
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}
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}
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impl<'a, T, D> ParJoin for &'a Storage<T, D>
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where
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T: Component,
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D: core::ops::Deref<Target = MaskedStorage<T>>,
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T::Storage: Sync,
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{
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}
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impl<A, B> ParJoin for (A, B)
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where
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A: ParJoin,
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B: ParJoin,
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{
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}
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pub trait SystemData {
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fn setup(any: Box<dyn Any>);
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}
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impl<T: 'static> SystemData for ReadStorage<T>
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where
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T: Component,
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{
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fn setup(any: Box<dyn Any>) {
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let storage: &MaskedStorage<T> = any.downcast_ref().unwrap();
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<dyn Any as CastFrom<MaskedStorage<T>>>::cast(&storage);
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}
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}
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pub struct MaskedStorage<T: Component> {
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_inner: T::Storage,
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}
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pub unsafe trait CastFrom<T> {
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fn cast(t: &T) -> &Self;
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}
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unsafe impl<T> CastFrom<T> for dyn Any
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where
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T: Any + 'static,
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{
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fn cast(t: &T) -> &Self {
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t
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}
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}
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