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//! Component events.
use std::convert::Infallible;
use std::fmt::Debug;
use crate::Component;
/// Pair relation for events emitted when:
/// a) A entity with the target component is spawned.
/// b) The target component is added to a entity.
#[derive(Debug, Component)]
pub struct Added(Infallible);
/// Pair relation for events emitted when:
/// a) The target component is removed from a entity.
/// b) A entity with the target component is despawned.
#[derive(Debug, Component)]
pub struct Removed(Infallible);
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