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Chris Russell 9e2bd8ac18
Generic SystemParam impls for Option and Result (#18766) 
# Objective

Provide a generic `impl SystemParam for Option<P>` that uses system
parameter validation. This immediately gives useful impls for params
like `EventReader` and `GizmosState` that are defined in terms of `Res`.
It also allows third-party system parameters to be usable with `Option`,
which was previously impossible due to orphan rules.

Note that this is a behavior change for `Option<Single>`. It currently
fails validation if there are multiple matching entities, but with this
change it will pass validation and produce `None`.

Also provide an impl for `Result<P, SystemParamValidationError>`. This
allows systems to inspect the error if necessary, either for bubbling it
up or for checking the `skipped` flag.

Fixes #12634
Fixes #14949
Related to #18516

## Solution

Add generic `SystemParam` impls for `Option` and `Result`, and remove
the impls for specific types.

Update documentation and `fallible_params` example with the new
semantics for `Option<Single>`.
2025-05-07 18:20:08 +00:00
..
bevy_a11y Adopt consistent FooSystems naming convention for system sets (#18900) 2025-05-06 15:18:03 +00:00
bevy_animation Adopt consistent FooSystems naming convention for system sets (#18900) 2025-05-06 15:18:03 +00:00
bevy_anti_aliasing Adopt consistent FooSystems naming convention for system sets (#18900) 2025-05-06 15:18:03 +00:00
bevy_app Adopt consistent FooSystems naming convention for system sets (#18900) 2025-05-06 15:18:03 +00:00
bevy_asset Deprecated Begone! 0.16 Cleanup (#19108) 2025-05-07 18:17:41 +00:00
bevy_audio Adopt consistent FooSystems naming convention for system sets (#18900) 2025-05-06 15:18:03 +00:00
bevy_color Implemented Alpha for f32. (#18653) 2025-05-06 00:00:17 +00:00
bevy_core_pipeline Adopt consistent FooSystems naming convention for system sets (#18900) 2025-05-06 15:18:03 +00:00
bevy_derive
bevy_dev_tools Adopt consistent FooSystems naming convention for system sets (#18900) 2025-05-06 15:18:03 +00:00
bevy_diagnostic Update sysinfo version to 0.35.0 (#19028) 2025-05-05 05:49:23 +00:00
bevy_dylib don't disable std in bevy_dylib (#18807) 2025-04-11 18:44:53 +00:00
bevy_ecs Generic SystemParam impls for Option and Result (#18766) 2025-05-07 18:20:08 +00:00
bevy_encase_derive
bevy_gilrs Remove remaining internal use of !Send resources (#18386) 2025-05-06 22:23:59 +00:00
bevy_gizmos Adopt consistent FooSystems naming convention for system sets (#18900) 2025-05-06 15:18:03 +00:00
bevy_gltf Add image sampler configuration in GLTF loader (#17875) 2025-05-06 05:48:13 +00:00
bevy_image Missing punctuation (#19097) 2025-05-06 23:01:59 +00:00
bevy_input Adopt consistent FooSystems naming convention for system sets (#18900) 2025-05-06 15:18:03 +00:00
bevy_input_focus Adopt consistent FooSystems naming convention for system sets (#18900) 2025-05-06 15:18:03 +00:00
bevy_internal Revert "Allow partial support for bevy_log in no_std (#18782)" (#18816) 2025-04-14 21:15:01 +00:00
bevy_log feat(log): support customizing default log formatting (#17722) 2025-05-05 23:01:06 +00:00
bevy_macro_utils Fully qualify crate paths in BevyManifest (#18938) 2025-04-28 21:43:48 +00:00
bevy_math Deprecated Begone! 0.16 Cleanup (#19108) 2025-05-07 18:17:41 +00:00
bevy_mesh Rename bevy_platform_support to bevy_platform (#18813) 2025-04-11 23:13:28 +00:00
bevy_mikktspace fix new nightly lint on mikktspace (#18988) 2025-04-30 05:19:01 +00:00
bevy_pbr Adopt consistent FooSystems naming convention for system sets (#18900) 2025-05-06 15:18:03 +00:00
bevy_picking Adopt consistent FooSystems naming convention for system sets (#18900) 2025-05-06 15:18:03 +00:00
bevy_platform Create bevy_platform::cfg for viral feature management (#18822) 2025-05-06 00:52:15 +00:00
bevy_ptr
bevy_reflect Deprecated Begone! 0.16 Cleanup (#19108) 2025-05-07 18:17:41 +00:00
bevy_remote Adopt consistent FooSystems naming convention for system sets (#18900) 2025-05-06 15:18:03 +00:00
bevy_render Adopt consistent FooSystems naming convention for system sets (#18900) 2025-05-06 15:18:03 +00:00
bevy_scene Rename bevy_platform_support to bevy_platform (#18813) 2025-04-11 23:13:28 +00:00
bevy_sprite Adopt consistent FooSystems naming convention for system sets (#18900) 2025-05-06 15:18:03 +00:00
bevy_state Adopt consistent FooSystems naming convention for system sets (#18900) 2025-05-06 15:18:03 +00:00
bevy_tasks Rename bevy_platform_support to bevy_platform (#18813) 2025-04-11 23:13:28 +00:00
bevy_text Adopt consistent FooSystems naming convention for system sets (#18900) 2025-05-06 15:18:03 +00:00
bevy_time Adopt consistent FooSystems naming convention for system sets (#18900) 2025-05-06 15:18:03 +00:00
bevy_transform Deprecated Begone! 0.16 Cleanup (#19108) 2025-05-07 18:17:41 +00:00
bevy_ui Adopt consistent FooSystems naming convention for system sets (#18900) 2025-05-06 15:18:03 +00:00
bevy_utils Rename bevy_platform_support to bevy_platform (#18813) 2025-04-11 23:13:28 +00:00
bevy_window Expose deferred screen edges setting for ios devices (#18729) 2025-04-30 21:24:53 +00:00
bevy_winit Remove remaining internal use of !Send resources (#18386) 2025-05-06 22:23:59 +00:00