public static void AddRoomVisitedInvoker(IRoom roomVisitedInvoker)
{
// add the new invoker to the list of invokers
roomVisitedInvokers.Add(roomVisitedInvoker);
// ensure that all existing listeners are added to this new invoker
foreach (UnityAction <IRoom> listener in roomVisitedListeners)
{
roomVisitedInvoker.AddRoomVisitedListener(listener);
}
}
