pub struct OptionalQueryItem<'a, T, S>(pub &'a S, pub PhantomData<&'a T>)
where
    T: HasSchema;
Expand description

Wrapper for the Comp SystemParam used as QueryItem to iterate over entities optionally retrieving components from ComponentStore. Entities iterated over will not be filtered by OptionalQueryItem.

See Optional helper func for constructing OptionalQueryItem and usage.

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§0: &'a S§1: PhantomData<&'a T>

Trait Implementations§

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impl<'a, T, S, C> QueryItem for &'a OptionalQueryItem<'a, T, S>where T: HasSchema, C: ComponentIterBitset<'a, T> + 'a, S: Deref<Target = C> + 'a,

Immutably iterate over optional component with syntax: &Optional(&Comp<T>) / &Optional(&CompMut<T>). (For mutable optional iteration we require &mut OptionalMut(&mut CompMut<T>))

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type Iter = Map<UntypedComponentOptionalBitsetIterator<'a>, for<'b> fn(_: Option<SchemaRef<'b>>) -> Option<&'b T>>

The type of iterator this query item creates
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fn apply_bitset(&self, _bitset: &mut BitSetVec)

Modify the iteration bitset
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fn iter_with_bitset( self, bitset: Rc<BitSetVec> ) -> <&'a OptionalQueryItem<'a, T, S> as QueryItem>::Iter

Return an iterator over the provided bitset.

Auto Trait Implementations§

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impl<'a, T, S> RefUnwindSafe for OptionalQueryItem<'a, T, S>where S: RefUnwindSafe, T: RefUnwindSafe,

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impl<'a, T, S> Send for OptionalQueryItem<'a, T, S>where S: Sync,

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impl<'a, T, S> Sync for OptionalQueryItem<'a, T, S>where S: Sync,

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impl<'a, T, S> Unpin for OptionalQueryItem<'a, T, S>

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impl<'a, T, S> UnwindSafe for OptionalQueryItem<'a, T, S>where S: RefUnwindSafe, T: RefUnwindSafe,

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

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fn type_id(&self) -> TypeId

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fn explicit(self, class: Class, tag: u32) -> TaggedParser<'a, Explicit, Self, E>

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fn explicit(self, class: Class, tag: u32) -> TaggedParser<'a, Explicit, Self, E>

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fn implicit( self, class: Class, constructed: bool, tag: u32 ) -> TaggedParser<'a, Implicit, Self, E>

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fn implicit( self, class: Class, constructed: bool, tag: u32 ) -> TaggedParser<'a, Implicit, Self, E>

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fn raw_drop_cb() -> Unsafe<&'static (dyn Fn(*mut c_void) + Send + Sync)>

Get a callback suitable for [SchemaData].
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