Method notified

3rdparty/libprocess/include/process/sequence.hpp:160–172

  // Invoked when a notifier is set.
  template <typename T>
  static void notified(
      Owned<Promise<T>> promise,
      const lambda::function<Future<T>()>& callback)
  {
    if (promise->future().hasDiscard()) {
      // The user has shown the intention to discard this callback
      // (i.e., by calling future.discard()). As a result, we will
      // just skip this callback.
      promise->discard();
    } else {
      promise->associate(callback());
    }
  }

  Future<Nothing> last;
};