wecs_core/query/
query_component.rs

1use crate::{
2    component::{Component, ComponentId, ComponentList},
3    entity::EntityId,
4    world::UnsafeWorldCell,
5};
6
7pub trait QueryComponent {
8    type Item<'world>: QueryComponent;
9
10    fn get_component_ids() -> Vec<ComponentId>;
11
12    fn get_component<'world>(
13        world: UnsafeWorldCell<'world>,
14        entity_id: EntityId,
15    ) -> Self::Item<'world>;
16}
17
18macro_rules! impl_qc_for {
19    ( $($n:ident),* ) => {
20        #[allow(non_snake_case)]
21        impl<$($n,)*> QueryComponent for ($($n,)*)
22        where $($n: QueryComponent,)* {
23            type Item<'world> = ($($n::Item<'world>,)*);
24
25            fn get_component_ids() -> Vec<ComponentId> {
26                let mut vec = Vec::new();
27
28                $(vec.extend($n::get_component_ids());)*
29
30                vec
31            }
32
33            fn get_component<'world>(
34                world: UnsafeWorldCell<'world>,
35                entity_id: EntityId,
36            ) -> Self::Item<'world> {
37                $(let $n = $n::get_component(world, entity_id);)*
38
39                ($($n,)*)
40            }
41        }
42    };
43}
44
45impl_qc_for!(T1);
wecs_core/query/query_component.rs

wecs_core/query/
query_component.rs
