pub trait Command: Send + 'static {
// Required method
fn write(self, world: &mut World);
}Expand description
A World mutation.
Should be used with Commands::add.
Usage
// Our world resource
#[derive(Resource, Default)]
struct Counter(u64);
// Our custom command
struct AddToCounter(u64);
impl Command for AddToCounter {
fn write(self, world: &mut World) {
let mut counter = world.get_resource_or_insert_with(Counter::default);
counter.0 += self.0;
}
}
fn some_system(mut commands: Commands) {
commands.add(AddToCounter(42));
}