Struct rs_ecs::QueryMap

pub struct QueryMap<'q, S> where
    S: QuerySpec,  { /* fields omitted */ }

Provides random access to the entities which match a certain Query.

Implementations

impl<S> QueryMap<'_, S> where
    S: QuerySpec, 

pub fn get<'m>(&'m self, ent: Entity) -> Option<<S::Fetch as Fetch<'m>>::Item> where
    S::Fetch: FetchShared, 

Access the queried components of the given Entity

Examples

let mut world = World::new();

let entity1 = world.alloc();
world.insert(entity1, (42_i32, 1.0_f32));

let entity2 = world.alloc();
world.insert(entity2, (23_i32,));

let mut query = Query::<(&i32, Option<&f32>)>::new();
let mut query = query.borrow(&world);
let mut query = query.map();

let (i1, f1) = query.get(entity1).unwrap();
let (i2, f2) = query.get(entity2).unwrap();

assert_eq!(*i1, 42);
assert_eq!(f1.copied(), Some(1.0));
assert_eq!(*i2, 23);
assert_eq!(f2.copied(), None);

pub fn get_mut<'m>(
    &'m mut self,
    ent: Entity
) -> Option<<S::Fetch as Fetch<'m>>::Item>

Exclusively access the queried components of the given Entity