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ecs: implement Access for tuples via macro

master
q3k 2021-03-21 21:45:14 +00:00
parent 4d39aee4f5
commit 1db8479493
1 changed files with 19 additions and 38 deletions
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57
lib/ecs/src/system.rs
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@ -81,47 +81,28 @@ impl<'a, T: component::Global> Access<'a> for ReadWriteGlobal<'a, T> {
}
}
impl <'a,
T: Access<'a>,
U: Access<'a>,
> Access<'a> for (T, U) {
fn fetch(world: &'a World) -> Self {
(
T::fetch(world),
U::fetch(world),
)
macro_rules! impl_access_tuple {
( $($ty:ident),* ) => {
impl <'a, $($ty),*> Access<'a> for ( $($ty,)* )
where $( $ty : Access<'a> ),*
{
fn fetch(world: &'a World) -> Self {
( $( $ty::fetch(world), )* )
}
}
}
}
impl <'a,
T: Access<'a>,
U: Access<'a>,
V: Access<'a>,
> Access<'a> for (T, U, V) {
fn fetch(world: &'a World) -> Self {
(
T::fetch(world),
U::fetch(world),
V::fetch(world),
)
}
}
impl <'a,
T: Access<'a>,
U: Access<'a>,
V: Access<'a>,
W: Access<'a>,
> Access<'a> for (T, U, V, W) {
fn fetch(world: &'a World) -> Self {
(
T::fetch(world),
U::fetch(world),
V::fetch(world),
W::fetch(world),
)
}
}
impl_access_tuple!(A);
impl_access_tuple!(A, B);
impl_access_tuple!(A, B, C);
impl_access_tuple!(A, B, C, D);
impl_access_tuple!(A, B, C, D, E);
impl_access_tuple!(A, B, C, D, E, F);
impl_access_tuple!(A, B, C, D, E, F, G);
impl_access_tuple!(A, B, C, D, E, F, G, H);
impl_access_tuple!(A, B, C, D, E, F, G, H, I);
impl_access_tuple!(A, B, C, D, E, F, G, H, I, J);
pub struct Processor<'a> {
world: &'a World,