radiish 6ab8767d3b reflect: implement the unique reflect rfc (#7207) ... # Objective - Implements the [Unique Reflect RFC](https://github.com/nicopap/rfcs/blob/bevy-reflect-api/rfcs/56-better-reflect.md). ## Solution - Implements the RFC. - This implementation differs in some ways from the RFC: - In the RFC, it was suggested `Reflect: Any` but `PartialReflect: ?Any`. During initial implementation I tried this, but we assume the `PartialReflect: 'static` in a lot of places and the changes required crept out of the scope of this PR. - `PartialReflect::try_into_reflect` originally returned `Option<Box<dyn Reflect>>` but i changed this to `Result<Box<dyn Reflect>, Box<dyn PartialReflect>>` since the method takes by value and otherwise there would be no way to recover the type. `as_full` and `as_full_mut` both still return `Option<&(mut) dyn Reflect>`. --- ## Changelog - Added `PartialReflect`. - `Reflect` is now a subtrait of `PartialReflect`. - Moved most methods on `Reflect` to the new `PartialReflect`. - Added `PartialReflect::{as_partial_reflect, as_partial_reflect_mut, into_partial_reflect}`. - Added `PartialReflect::{try_as_reflect, try_as_reflect_mut, try_into_reflect}`. - Added `<dyn PartialReflect>::{try_downcast_ref, try_downcast_mut, try_downcast, try_take}` supplementing the methods on `dyn Reflect`. ## Migration Guide - Most instances of `dyn Reflect` should be changed to `dyn PartialReflect` which is less restrictive, however trait bounds should generally stay as `T: Reflect`. - The new `PartialReflect::{as_partial_reflect, as_partial_reflect_mut, into_partial_reflect, try_as_reflect, try_as_reflect_mut, try_into_reflect}` methods as well as `Reflect::{as_reflect, as_reflect_mut, into_reflect}` will need to be implemented for manual implementors of `Reflect`. ## Future Work - This PR is designed to be followed up by another "Unique Reflect Phase 2" that addresses the following points: - Investigate making serialization revolve around `Reflect` instead of `PartialReflect`. - [Remove the `try_*` methods on `dyn PartialReflect` since they are stop gaps](https://github.com/bevyengine/bevy/pull/7207#discussion_r1083476050). - Investigate usages like `ReflectComponent`. In the places they currently use `PartialReflect`, should they be changed to use `Reflect`? - Merging this opens the door to lots of reflection features we haven't been able to implement. - We could re-add [the `Reflectable` trait](8e3488c880/crates/bevy_reflect/src/reflect.rs (L337-L342)) and make `FromReflect` a requirement to improve [`FromReflect` ergonomics](https://github.com/bevyengine/rfcs/pull/59). This is currently not possible because dynamic types cannot sensibly be `FromReflect`. - Since this is an alternative to #5772, #5781 would be made cleaner. --------- Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com> Co-authored-by: Gino Valente <49806985+MrGVSV@users.noreply.github.com>		2024-08-12 17:01:41 +00:00
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src	reflect: implement the unique reflect rfc (#7207)	2024-08-12 17:01:41 +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