Struct EventReader

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pub struct EventReader<'w, 's, T>where
    T: Resource,
{ /* private fields */ }

Expand description

Reads events of type T in order and tracks which events have already been read.

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impl<'w, 's, T> EventReader<'w, 's, T>
where T: Resource,

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pub fn iter(&mut self) -> impl DoubleEndedIterator

Iterates over the events this EventReader has not seen yet. This updates the EventReader’s event counter, which means subsequent event reads will not include events that happened before now.

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pub fn iter_with_id(&mut self) -> impl DoubleEndedIterator

Like iter, except also returning the EventId of the events.

Trait Implementations§

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impl<'w, 's, T> SystemParam for EventReader<'w, 's, T>
where T: Resource,

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type Fetch = EventReaderState<(<Local<'s, (usize, PhantomData<T>)> as SystemParam>::Fetch, <Res<'w, Events<T>> as SystemParam>::Fetch), T>

Auto Trait Implementations§

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impl<'w, 's, T> Freeze for EventReader<'w, 's, T>

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impl<'w, 's, T> RefUnwindSafe for EventReader<'w, 's, T>
where T: RefUnwindSafe,

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impl<'w, 's, T> !UnwindSafe for EventReader<'w, 's, T>

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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impl<T> Downcast<T> for T

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fn downcast(&self) -> &T

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impl<T> Downcast for T
where T: Any,

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fn into_any(self: Box<T>) -> Box<dyn Any>

Convert Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>. Box<dyn Any> can then be further downcast into Box<ConcreteType> where ConcreteType implements Trait.

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fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>

Convert Rc<Trait> (where Trait: Downcast) to Rc<Any>. Rc<Any> can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.

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fn as_any(&self) -> &(dyn Any + 'static)

Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s.

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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.

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impl<T> DowncastSync for T
where T: Any + Send + Sync,

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fn into_any_arc(self: Arc<T>) -> Arc<dyn Any + Send + Sync>

Convert Arc<Trait> (where Trait: Downcast) to Arc<Any>. Arc<Any> can then be further downcast into Arc<ConcreteType> where ConcreteType implements Trait.

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