pub trait Event<S> {
// Required method
fn evolve(&self, state: &mut S);
}Expand description
An event that encodes a change to a layer’s state
Required Methods§
Sourcefn evolve(&self, state: &mut S)
fn evolve(&self, state: &mut S)
Evolve the provided state
This is the only method that Layer gives mutable access to the
state, making sure that all changes to the state are captured as events.
Implementations of this method are supposed to be relatively dumb. Any
decisions that go into updating the state should be made in
Command::decide, and encoded into the event.