Document MapEntities trait.
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alice-i-cecile
added
A-ECS
| @@ -8,6 +8,32 @@ pub enum MapEntitiesError { | |||
| EntityNotFound(Entity), | |||
| } | |||
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| /// Operation to map all contained [`Entity`](crate::entity::Entity) fields in | |||
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| /// Operation to map all contained [`Entity`](crate::entity::Entity) fields in | |
| /// Operation to map all contained [`Entity`] fields in |
Because Entity is in scope for this module, we don't need to clarify the path.
| /// | ||
| /// If a component contains [`Entity`](crate::entity::Entity) values | ||
| /// that refer to other entities in the same world and scene functionality | ||
| /// is used to create such components, this trait must be implemented. The |
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| /// is used to create such components, this trait must be implemented. The | |
| /// is used to create such components, this trait must be implemented. The aim |
| /// | ||
| /// ``` | ||
| /// #[derive(Component)] | ||
| /// struct MyEntityRefs { |
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IMO something like Spring would be equivalent and better motivated.
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I've never noticed this trait before. This seems like something that would be a good candidate for a derive macro- something like:
#[derive(Component, MapEntities)]
struct MyEntityRefs {
a: Entity,
b: Entity,
#[map(ignore)]
c: Entity
}
to compare to the example here. (Maybe the ignore helper is useless, but that sort of syntax if any helpers are needed)
Are there any cases where the implementation should be more complex than self.X = entity_map.get(self.X)??
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@nakedible Do you mind if I adopt this PR? #6740 attempts to document the trait and the error, but this is a far more extensive set of comments and includes a doctest example. Your work here will be merged into that PR or a follow-up PR to it and you'll be credited for it. |
|
Please do! I got distracted and now am really busy. And feel free to rewrite everything, credit is not important. |
james7132
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Nov 25, 2022
|
Alright, I incorporated the changes here into #6740, and resolved the open comments. The merge should mark you as a co-author on that PR. |
bors bot
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Nov 28, 2022
# Objective The soundness of the ECS `World` partially relies on the correctness of the state of `Entities` stored within it. We're currently allowing users to (unsafely) mutate it, as well as readily construct it without using a `World`. While this is not strictly unsound so long as users (including `bevy_render`) safely use the APIs, it's a fairly easy path to unsoundness without much of a guard rail. Addresses #3362 for `bevy_ecs::entity`. Incorporates the changes from #3985. ## Solution Remove `Entities`'s `Default` implementation and force access to the type to only be through a properly constructed `World`. Additional cleanup for other parts of `bevy_ecs::entity`: - `Entity::index` and `Entity::generation` are no longer `pub(crate)`, opting to force the rest of bevy_ecs to use the public interface to access these values. - `EntityMeta` is no longer `pub` and also not `pub(crate)` to attempt to cut down on updating `generation` without going through an `Entities` API. It's currently inaccessible except via the `pub(crate)` Vec on `Entities`, there was no way for an outside user to use it. - Added `Entities::set`, an unsafe `pub(crate)` API for setting the location of an Entity (parallel to `Entities::get`) that replaces the internal case where we need to set the location of an entity when it's been spawned, moved, or despawned. - `Entities::alloc_at_without_replacement` is only used in `World::get_or_spawn` within the first party crates, and I cannot find a public use of this API in any ecosystem crate that I've checked (via GitHub search). - Attempted to document the few remaining undocumented public APIs in the module. --- ## Changelog Removed: `Entities`'s `Default` implementation. Removed: `EntityMeta` Removed: `Entities::alloc_at_without_replacement` and `AllocAtWithoutReplacement`. Co-authored-by: james7132 <contact@jamessliu.com> Co-authored-by: James Liu <contact@jamessliu.com>
bors bot
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Nov 28, 2022
# Objective The soundness of the ECS `World` partially relies on the correctness of the state of `Entities` stored within it. We're currently allowing users to (unsafely) mutate it, as well as readily construct it without using a `World`. While this is not strictly unsound so long as users (including `bevy_render`) safely use the APIs, it's a fairly easy path to unsoundness without much of a guard rail. Addresses #3362 for `bevy_ecs::entity`. Incorporates the changes from #3985. ## Solution Remove `Entities`'s `Default` implementation and force access to the type to only be through a properly constructed `World`. Additional cleanup for other parts of `bevy_ecs::entity`: - `Entity::index` and `Entity::generation` are no longer `pub(crate)`, opting to force the rest of bevy_ecs to use the public interface to access these values. - `EntityMeta` is no longer `pub` and also not `pub(crate)` to attempt to cut down on updating `generation` without going through an `Entities` API. It's currently inaccessible except via the `pub(crate)` Vec on `Entities`, there was no way for an outside user to use it. - Added `Entities::set`, an unsafe `pub(crate)` API for setting the location of an Entity (parallel to `Entities::get`) that replaces the internal case where we need to set the location of an entity when it's been spawned, moved, or despawned. - `Entities::alloc_at_without_replacement` is only used in `World::get_or_spawn` within the first party crates, and I cannot find a public use of this API in any ecosystem crate that I've checked (via GitHub search). - Attempted to document the few remaining undocumented public APIs in the module. --- ## Changelog Removed: `Entities`'s `Default` implementation. Removed: `EntityMeta` Removed: `Entities::alloc_at_without_replacement` and `AllocAtWithoutReplacement`. Co-authored-by: james7132 <contact@jamessliu.com> Co-authored-by: James Liu <contact@jamessliu.com>
taiyoungjang
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Dec 15, 2022
# Objective The soundness of the ECS `World` partially relies on the correctness of the state of `Entities` stored within it. We're currently allowing users to (unsafely) mutate it, as well as readily construct it without using a `World`. While this is not strictly unsound so long as users (including `bevy_render`) safely use the APIs, it's a fairly easy path to unsoundness without much of a guard rail. Addresses bevyengine#3362 for `bevy_ecs::entity`. Incorporates the changes from bevyengine#3985. ## Solution Remove `Entities`'s `Default` implementation and force access to the type to only be through a properly constructed `World`. Additional cleanup for other parts of `bevy_ecs::entity`: - `Entity::index` and `Entity::generation` are no longer `pub(crate)`, opting to force the rest of bevy_ecs to use the public interface to access these values. - `EntityMeta` is no longer `pub` and also not `pub(crate)` to attempt to cut down on updating `generation` without going through an `Entities` API. It's currently inaccessible except via the `pub(crate)` Vec on `Entities`, there was no way for an outside user to use it. - Added `Entities::set`, an unsafe `pub(crate)` API for setting the location of an Entity (parallel to `Entities::get`) that replaces the internal case where we need to set the location of an entity when it's been spawned, moved, or despawned. - `Entities::alloc_at_without_replacement` is only used in `World::get_or_spawn` within the first party crates, and I cannot find a public use of this API in any ecosystem crate that I've checked (via GitHub search). - Attempted to document the few remaining undocumented public APIs in the module. --- ## Changelog Removed: `Entities`'s `Default` implementation. Removed: `EntityMeta` Removed: `Entities::alloc_at_without_replacement` and `AllocAtWithoutReplacement`. Co-authored-by: james7132 <contact@jamessliu.com> Co-authored-by: James Liu <contact@jamessliu.com>
alradish
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Jan 22, 2023
# Objective The soundness of the ECS `World` partially relies on the correctness of the state of `Entities` stored within it. We're currently allowing users to (unsafely) mutate it, as well as readily construct it without using a `World`. While this is not strictly unsound so long as users (including `bevy_render`) safely use the APIs, it's a fairly easy path to unsoundness without much of a guard rail. Addresses bevyengine#3362 for `bevy_ecs::entity`. Incorporates the changes from bevyengine#3985. ## Solution Remove `Entities`'s `Default` implementation and force access to the type to only be through a properly constructed `World`. Additional cleanup for other parts of `bevy_ecs::entity`: - `Entity::index` and `Entity::generation` are no longer `pub(crate)`, opting to force the rest of bevy_ecs to use the public interface to access these values. - `EntityMeta` is no longer `pub` and also not `pub(crate)` to attempt to cut down on updating `generation` without going through an `Entities` API. It's currently inaccessible except via the `pub(crate)` Vec on `Entities`, there was no way for an outside user to use it. - Added `Entities::set`, an unsafe `pub(crate)` API for setting the location of an Entity (parallel to `Entities::get`) that replaces the internal case where we need to set the location of an entity when it's been spawned, moved, or despawned. - `Entities::alloc_at_without_replacement` is only used in `World::get_or_spawn` within the first party crates, and I cannot find a public use of this API in any ecosystem crate that I've checked (via GitHub search). - Attempted to document the few remaining undocumented public APIs in the module. --- ## Changelog Removed: `Entities`'s `Default` implementation. Removed: `EntityMeta` Removed: `Entities::alloc_at_without_replacement` and `AllocAtWithoutReplacement`. Co-authored-by: james7132 <contact@jamessliu.com> Co-authored-by: James Liu <contact@jamessliu.com>
ItsDoot
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Feb 1, 2023
# Objective The soundness of the ECS `World` partially relies on the correctness of the state of `Entities` stored within it. We're currently allowing users to (unsafely) mutate it, as well as readily construct it without using a `World`. While this is not strictly unsound so long as users (including `bevy_render`) safely use the APIs, it's a fairly easy path to unsoundness without much of a guard rail. Addresses bevyengine#3362 for `bevy_ecs::entity`. Incorporates the changes from bevyengine#3985. ## Solution Remove `Entities`'s `Default` implementation and force access to the type to only be through a properly constructed `World`. Additional cleanup for other parts of `bevy_ecs::entity`: - `Entity::index` and `Entity::generation` are no longer `pub(crate)`, opting to force the rest of bevy_ecs to use the public interface to access these values. - `EntityMeta` is no longer `pub` and also not `pub(crate)` to attempt to cut down on updating `generation` without going through an `Entities` API. It's currently inaccessible except via the `pub(crate)` Vec on `Entities`, there was no way for an outside user to use it. - Added `Entities::set`, an unsafe `pub(crate)` API for setting the location of an Entity (parallel to `Entities::get`) that replaces the internal case where we need to set the location of an entity when it's been spawned, moved, or despawned. - `Entities::alloc_at_without_replacement` is only used in `World::get_or_spawn` within the first party crates, and I cannot find a public use of this API in any ecosystem crate that I've checked (via GitHub search). - Attempted to document the few remaining undocumented public APIs in the module. --- ## Changelog Removed: `Entities`'s `Default` implementation. Removed: `EntityMeta` Removed: `Entities::alloc_at_without_replacement` and `AllocAtWithoutReplacement`. Co-authored-by: james7132 <contact@jamessliu.com> Co-authored-by: James Liu <contact@jamessliu.com>
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Objective
bevy::ecs::entity::MapEntitiestrait is undocumented, even though users need to implement it in some casesSolution