#[derive(Query)]
Expand description
Implement Query
for a struct
Queries structs can be passed to the type parameter of World::query
. They must have exactly
one lifetime parameter, and all of their fields must be queries (e.g. references) using that
lifetime.
Example
#[derive(Query, Debug, PartialEq)]
struct Foo<'a> {
x: &'a i32,
y: &'a mut bool,
}
let mut world = World::new();
let e = world.spawn((42, false));
assert_eq!(
world.query_one_mut::<Foo>(e).unwrap(),
Foo {
x: &42,
y: &mut false
}
);