Struct bevy::ecs::system::RemovedComponents
[−]pub struct RemovedComponents<'a, T> where
T: Component, { /* private fields */ }
Expand description
A SystemParam
that grants access to the entities that had their T
Component
removed.
Note that this does not allow you to see which data existed before removal.
If you need this, you will need to track the component data value on your own,
using a regularly scheduled system that requests Query<(Entity, &T), Changed<T>>
and stores the data somewhere safe to later cross-reference.
If you are using bevy_ecs
as a standalone crate,
note that the RemovedComponents
list will not be automatically cleared for you,
and will need to be manually flushed using World::clear_trackers
For users of bevy
itself, this is automatically done in a system added by MinimalPlugins
or DefaultPlugins
at the end of each pass of the game loop during the CoreStage::Last
stage. As such RemovedComponents
systems should be scheduled after the stage where
removal occurs but before CoreStage::Last
.
Examples
Basic usage:
fn react_on_removal(removed: RemovedComponents<MyComponent>) {
removed.iter().for_each(|removed_entity| println!("{:?}", removed_entity));
}
Implementations
impl<'a, T> RemovedComponents<'a, T> where
T: Component,
impl<'a, T> RemovedComponents<'a, T> where
T: Component,
Trait Implementations
impl<'a, T> SystemParam for RemovedComponents<'a, T> where
T: Component,
impl<'a, T> SystemParam for RemovedComponents<'a, T> where
T: Component,
type Fetch = RemovedComponentsState<T>
Auto Trait Implementations
impl<'a, T> !RefUnwindSafe for RemovedComponents<'a, T>
impl<'a, T> Send for RemovedComponents<'a, T>
impl<'a, T> Sync for RemovedComponents<'a, T>
impl<'a, T> Unpin for RemovedComponents<'a, T> where
T: Unpin,
impl<'a, T> !UnwindSafe for RemovedComponents<'a, T>
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
impl<T> Downcast for T where
T: Any,
impl<T> Downcast for T where
T: Any,
fn into_any(self: Box<T, Global>) -> Box<dyn Any + 'static, Global>ⓘNotable traits for Box<F, A>impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;
fn into_any(self: Box<T, Global>) -> Box<dyn Any + 'static, Global>ⓘNotable traits for Box<F, A>impl<F, A> Future for Box<F, A> where
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;
F: Future + Unpin + ?Sized,
A: Allocator + 'static, type Output = <F as Future>::Output;impl<I, A> Iterator for Box<I, A> where
I: Iterator + ?Sized,
A: Allocator, type Item = <I as Iterator>::Item;
Convert Box<dyn Trait>
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) to Box<dyn Any>
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can
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into Box<ConcreteType>
where ConcreteType
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fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>
fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>
Convert Rc<Trait>
(where Trait: Downcast
) to Rc<Any>
. Rc<Any>
can then be
further downcast
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where ConcreteType
implements Trait
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fn as_any(&self) -> &(dyn Any + 'static)
fn as_any(&self) -> &(dyn Any + 'static)
Convert &Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
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fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
Convert &mut Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &mut Any
’s vtable from &mut Trait
’s. Read more
sourceimpl<T> Instrument for T
impl<T> Instrument for T
sourcefn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
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T: Future, type Output = <T as Future>::Output;
T: Future, type Output = <T as Future>::Output;
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V: MultiLane<T>,
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V: MultiLane<T>,
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impl<T> WithSubscriber for T
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S: Into<Dispatch>,
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S: Into<Dispatch>,
T: Future, type Output = <T as Future>::Output;
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