on<E extends T> method

@override void on<E extends T>(AtomListener<E> listener)

Adds a listener which executes when value is set as E

Implementation

@override
void on<E extends T>(AtomListener<E> listener) {
  callback() {
    if (value is E) {
      listener((value as E));
    }
  }

  super.addListener(callback);
  _listeners.add(callback);
}