Chris Russell 4be8e497ca SystemParamBuilder - Allow deriving a SystemParamBuilder struct when deriving SystemParam. (#14818) ... # Objective Allow `SystemParamBuilder` implementations for custom system parameters created using `#[derive(SystemParam)]`. ## Solution Extend the derive macro to accept a `#[system_param(builder)]` attribute. When present, emit a builder type with a field corresponding to each field of the param. ## Example ```rust #[derive(SystemParam)] #[system_param(builder)] struct CustomParam<'w, 's> { query: Query<'w, 's, ()>, local: Local<'s, usize>, } let system = (CustomParamBuilder { local: LocalBuilder(100), query: QueryParamBuilder::new(|builder| { builder.with::<A>(); }), },) .build_state(&mut world) .build_system(|param: CustomParam| *param.local + param.query.iter().count()); ```		2024-08-28 18:24:52 +00:00
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src	SystemParamBuilder - Allow deriving a SystemParamBuilder struct when deriving SystemParam. (#14818)	2024-08-28 18:24:52 +00:00
Cargo.toml	Generate links to definition in source code pages on docs.rs and dev-docs.bevyengine.org (#12965)	2024-07-29 23:10:16 +00:00