Giacomo Stevanato e9e9e5e15d Add query reborrowing (#14690) ... # 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.		2024-08-15 17:38:56 +00:00
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src	Add query reborrowing (#14690)	2024-08-15 17:38:56 +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