Torstein Grindvik 67aa2953d0 Extract component derive (#7399) ... # Objective In simple cases we might want to derive the `ExtractComponent` trait. This adds symmetry to the existing `ExtractResource` derive. ## Solution Add an implementation of `#[derive(ExtractComponent)]`. The implementation is adapted from the existing `ExtractResource` derive macro. Additionally, there is an attribute called `extract_component_filter`. This allows specifying a query filter type used when extracting. If not specified, no filter (equal to `()`) is used. So: ```rust #[derive(Component, Clone, ExtractComponent)] #[extract_component_filter(With<Fuel>)] pub struct Car { pub wheels: usize, } ``` would expand to (a bit cleaned up here): ```rust impl ExtractComponent for Car { type Query = &'static Self; type Filter = With<Fuel>; type Out = Self; fn extract_component(item: QueryItem<'_, Self::Query>) -> Option<Self::Out> { Some(item.clone()) } } ``` --- ## Changelog - Added the ability to `#[derive(ExtractComponent)]` with an optional filter.		2023-01-30 18:12:16 +00:00
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src	Extract component derive (#7399)	2023-01-30 18:12:16 +00:00
Cargo.toml	Release 0.9.0 (#6568)	2022-11-12 20:01:29 +00:00