Struct bones_lib::ecs::prelude::OptionalQueryItem

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

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.

Tuple Fields

0: &'a S

1: PhantomData<&'a T>

Trait Implementations

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>))

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

The type of iterator this query item creates

fn apply_bitset(&self, _bitset: &mut BitSetVec)

Modify the iteration bitset

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

Return an iterator over the provided bitset.