mirror of
https://github.com/bevyengine/bevy
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e9e9e5e15d
# Objective - Sometimes some method or function takes an owned `Query`, but we don't want to give up ours; - transmuting it technically a solution, but it more costly than necessary. - Make query iterators more flexible - this would allow the equivalent of `slice::split_first`/`slice::split_first_mut` for query iterators - helps with requests like #14685 ## Solution - Add a way for reborrowing queries, that is going from a `&'a mut Query<'w, 's, D, F>` to a `Query<'a, 's, D, F>`: - this is safe because the original query will be borrowed while the new query exists and thus no aliased access can happen; - it's basically the equivalent of going from `&'short mut &'long mut T` to `&'short mut T` the the compiler automatically implements. - Add a way for getting the remainder of a query iterator: - this is interesting also because the original iterator keeps its position, which was not possible before; - this in turn requires a way to reborrow query fetches, which I had to add to `WorldQuery`. ## Showcase - You can now reborrow a `Query`, getting an equivalent `Query` with a shorter lifetime. Previously this was possible for read-only queries by using `Query::to_readonly`, now it's possible for mutable queries too; - You can now separately iterate over the remainder of `QueryIter`. ## Migration Guide - `WorldQuery` now has an additional `shrink_fetch` method you have to implement if you were implementing `WorldQuery` manually. |
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| bevy_a11y | ||
| bevy_animation | ||
| bevy_app | ||
| bevy_asset | ||
| bevy_audio | ||
| bevy_color | ||
| bevy_core | ||
| bevy_core_pipeline | ||
| bevy_derive | ||
| bevy_dev_tools | ||
| bevy_diagnostic | ||
| bevy_dylib | ||
| bevy_ecs | ||
| bevy_encase_derive | ||
| bevy_gilrs | ||
| bevy_gizmos | ||
| bevy_gltf | ||
| bevy_hierarchy | ||
| bevy_input | ||
| bevy_internal | ||
| bevy_log | ||
| bevy_macro_utils | ||
| bevy_math | ||
| bevy_mikktspace | ||
| bevy_pbr | ||
| bevy_picking | ||
| bevy_ptr | ||
| bevy_reflect | ||
| bevy_render | ||
| bevy_scene | ||
| bevy_sprite | ||
| bevy_state | ||
| bevy_tasks | ||
| bevy_text | ||
| bevy_time | ||
| bevy_transform | ||
| bevy_ui | ||
| bevy_utils | ||
| bevy_window | ||
| bevy_winit | ||