Event Mesesenger Listener

using UnityEngine;
using System.Collections;

namespace Util {

	// =========================================================================
	public class EventListener<T> where T: GameEvent {

		public T receivedEvent;

		// -------------------------------------------------------------------------
	    public IEnumerator Listen() {

			receivedEvent = null;
			EventMessenger.Instance.AddListener<T>(OnReceiveEvent);

			do
	        {
	            yield return null;
	        } while (receivedEvent == null);

			EventMessenger.Instance.RemoveListener<T>(OnReceiveEvent);
	    }

		// -------------------------------------------------------------------------
		public T TakeEvent() {

			T eventToReturn = receivedEvent;
			receivedEvent = null;
			return eventToReturn;
		}

		// -------------------------------------------------------------------------
		void OnReceiveEvent(T newEvent) {
			receivedEvent = newEvent;
		}
	}
}