Trait Kind

Source

pub trait Kind:
    Sized
    + 'static
    + Send
    + Sync {
    type Filter: QueryFilter;

    // Provided method
    fn debug_name() -> String { ... }
}

Expand description

A type which represents the kind of an Entity.

An entity is of kind T if it matches Query<Entity, <T as Kind>::Filter>.

By default, an entity with a Component of type T is also of kind T.

§Examples


#[derive(Component)]
struct Apple;

#[derive(Component)]
struct Orange;

struct Fruit;

impl Kind for Fruit {
    type Filter = Or<(With<Apple>, With<Orange>)>;
}

fn fruits(query: Query<Instance<Fruit>>) {
    for fruit in query.iter() {
        println!("{fruit:?} is a fruit!");
    }
}