Struct Has 

pub struct Has<T: 'static>(/* private fields */);

Trait Implementations

impl<T: 'static> FetchComponents for Has<T>

type Fetch<'w> = bool

Per archetype/table state used by this FetchComponents to fetch Self::Item

type Item<'w> = bool

The item returned by this FetchComponents

type ReadOnly = Has<T>

ReadOnly

type State = Arc<Column>

State used to construct a Self::Fetch. This will be cached inside QueryState, so it is best to move as much data / computation here as possible to reduce the cost of constructing Self::Fetch.

fn init_state(world: &mut World, meta: &mut SystemMeta) -> Self::State

initializes ReadWrite for this FetchComponents type.

fn init_fetch<'w>( _world: &'w World, state: &'w Self::State, index: ArchetypeIndex, _tick: Tick, _last_run: Tick, ) -> Self::Fetch<'w>

Creates a new instance of this fetch.

fn init_fetch_opt<'w>( world: &'w World, state: &'w Self::State, index: ArchetypeIndex, tick: Tick, last_run: Tick, ) -> Option<Self::Fetch<'w>>

fn fetch<'w>(fetch: &Self::Fetch<'w>, _row: Row, _e: Entity) -> Self::Item<'w>

Fetch Self::Item for either the given entity in the current [Table], or for the given entity in the current [Archetype]. This must always be called after [FetchComponents::set_table] with a table_row in the range of the current [Table] or after [FetchComponents::set_archetype] with a entity in the current archetype.