Struct EventWriter 

pub struct EventWriter<'w, T: Send + 'static> { /* private fields */ }

Exclusive write access to the Events<T> resource.

Use this in a system to send events that other systems can read on the next schedule tick via EventReader<T>.

fn fire_cannon(mut writer: EventWriter<'_, CannonFired>) {
    writer.send(CannonFired { power: 9000 });
}

Implementations

impl<'w, T: Send + 'static> EventWriter<'w, T>

pub fn send(&mut self, event: T)

Send an event. Readable by EventReader<T> systems on the next tick.

Trait Implementations

impl<T: Send + 'static> SystemParam for EventWriter<'_, T>

type Item<'w> = EventWriter<'w, T>

The concrete type produced for a given world lifetime.

fn access() -> Vec<Access>

Declare what world data this parameter accesses.

unsafe fn fetch<'w>(world: UnsafeWorldCell) -> Self::Item<'w>

Extract the parameter from the world.