Struct Read 

pub struct Read<T>(/* private fields */);

Marker for a read-only component parameter in a tuple-based query.

Trait Implementations

impl<A: 'static + Send + Sync> EntityQueryParam for Read<A>

type EntityItem<'a> = (Entity, &'a A)

The typed value handed to entity-aware closures for one row: the owning Entity followed by the component references.

unsafe fn for_each_entity_chunk<F>( entities: &[Entity], reads: &[&[u8]], _writes: &mut [&mut [u8]], f: &F, )

where F: for<'a> Fn(Self::EntityItem<'a>),

Iterates one chunk range and invokes f once per entity row.

unsafe fn for_each_entity_chunk_fallible<F>( entities: &[Entity], reads: &[&[u8]], _writes: &mut [&mut [u8]], f: &F, ) -> ECSResult<()>

where F: for<'a> Fn(Self::EntityItem<'a>) -> ECSResult<()>,

Iterates one chunk range with a fallible closure.

impl<A: 'static + Send + Sync> QueryParam for Read<A>

type Item<'a> = &'a A

The typed value handed to the closure for one row.

fn validate(query: &BuiltQuery) -> ECSResult<()>

Validates that the query shape (read/write counts) matches this param tuple.

unsafe fn for_each_chunk<F>(reads: &[&[u8]], _writes: &mut [&mut [u8]], f: &F)

where F: for<'a> Fn(Self::Item<'a>),

Iterates over a single chunk range, reinterpreting the raw byte slices as typed component slices and invoking f once per entity.