Implement multiple argument fn systems
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@ -41,42 +41,60 @@ pub struct FnSystem<F, Args> {
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args: Args,
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}
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impl<F, A> System for FnSystem<F, A>
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where
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A: FnArgFetcher,
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F: for<'a> FnMut(A::Arg<'a>) -> anyhow::Result<()>,
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{
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fn world_access(&self) -> Access {
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todo!()
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}
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macro_rules! impl_fn_system_tuple {
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( $($name: ident),+ ) => (
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#[allow(non_snake_case)]
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impl<F, $($name: FnArgFetcher,)+> System for FnSystem<F, ($($name,)+)>
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where
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F: for<'a> FnMut($($name::Arg<'a>,)+) -> anyhow::Result<()>,
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{
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fn world_access(&self) -> Access {
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todo!()
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}
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fn execute(&mut self, world: NonNull<World>) -> anyhow::Result<()> {
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let mut a = A::new();
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fn execute(&mut self, world: NonNull<World>) -> anyhow::Result<()> {
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$(let $name = unsafe { $name::new().get(world) };)+
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let a = unsafe { a.get(world) };
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(self.inner)($($name,)+)?;
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(self.inner)(a)?;
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Ok(())
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}
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}
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impl<F, A> IntoSystem<A> for F
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where
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A: FnArg,
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F: FnMut(A) -> anyhow::Result<()>,
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F: for<'a> FnMut(<A::Fetcher as FnArgFetcher>::Arg<'a>) -> anyhow::Result<()>,
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{
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type System = FnSystem<F, A::Fetcher>;
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fn into_system(self) -> Self::System {
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FnSystem {
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args: A::Fetcher::new(),
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inner: self
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Ok(())
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}
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}
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}
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impl<F, $($name: FnArg,)+> IntoSystem<($($name,)+)> for F
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where
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F: FnMut($($name,)+) -> anyhow::Result<()>,
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F: for<'a> FnMut($(<$name::Fetcher as FnArgFetcher>::Arg<'a>,)+) -> anyhow::Result<()>,
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{
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type System = FnSystem<F, ($($name::Fetcher,)+)>;
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fn into_system(self) -> Self::System {
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FnSystem {
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args: ($($name::Fetcher::new(),)+),
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inner: self
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}
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}
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}
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);
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}
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// Hopefully up to 16 arguments in a system is good enough.
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impl_fn_system_tuple!{ A }
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impl_fn_system_tuple!{ A, B }
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impl_fn_system_tuple!{ A, B, C }
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impl_fn_system_tuple!{ A, B, C, D }
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impl_fn_system_tuple!{ A, B, C, D, E }
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impl_fn_system_tuple!{ A, B, C, D, E, F2 }
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impl_fn_system_tuple!{ A, B, C, D, E, F2, G }
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impl_fn_system_tuple!{ A, B, C, D, E, F2, G, H }
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impl_fn_system_tuple!{ A, B, C, D, E, F2, G, H, I }
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impl_fn_system_tuple!{ A, B, C, D, E, F2, G, H, I, J }
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impl_fn_system_tuple!{ A, B, C, D, E, F2, G, H, I, J, K, L }
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impl_fn_system_tuple!{ A, B, C, D, E, F2, G, H, I, J, K, L, M }
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impl_fn_system_tuple!{ A, B, C, D, E, F2, G, H, I, J, K, L, M, N }
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impl_fn_system_tuple!{ A, B, C, D, E, F2, G, H, I, J, K, L, M, N, O }
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impl_fn_system_tuple!{ A, B, C, D, E, F2, G, H, I, J, K, L, M, N, O, P }
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/// An ArgFetcher implementation for query [`View`]s
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pub struct ViewArgFetcher<Q> {
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query: Q
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@ -95,6 +113,10 @@ impl<Q: Query> FnArgFetcher for ViewArgFetcher<Q> {
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}
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}
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fn world_access(&self) -> Access {
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todo!()
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}
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unsafe fn get<'a>(&mut self, world: NonNull<World>) -> Self::Arg<'a> {
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let world = &*world.as_ptr();
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let arch = world.archetypes.values().collect();
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@ -237,7 +259,7 @@ mod tests {
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}
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#[test]
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fn multi_system() {
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fn multi_view_system() {
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let mut world = World::new();
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world.spawn((Vec2::rand(), Vec3::rand()));
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world.spawn((Vec2::rand(), Vec3::rand()));
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@ -307,4 +329,26 @@ mod tests {
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let counter = world.get_resource::<SomeCounter>();
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assert_eq!(counter.0, 10);
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}
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#[test]
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fn multi_arg_system() {
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let mut world = World::new();
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world.spawn((Vec2::rand(), ));
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world.spawn((Vec2::rand(), ));
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world.add_resource(SomeCounter(0));
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let test_system = |mut counter: RefMut<SomeCounter>, view: View<QueryBorrow<Vec2>>| -> anyhow::Result<()> {
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for v2 in view.into_iter() {
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println!("Got v2 at '{:?}'", v2);
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counter.0 += 1;
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}
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Ok(())
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};
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test_system.into_system().execute(NonNull::from(&world)).unwrap();
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let counter = world.get_resource::<SomeCounter>();
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assert_eq!(counter.0, 2);
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}
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}
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