public void UsageCount()
{
var observers = new ObserverSet <DummyObserver>();
var dummyA = new DummyObserver();
var dummyB = new DummyObserver();
observers.Add(dummyA);
observers.Use(d => d.UsedCount++);
Assert.AreEqual(1, dummyA.UsedCount);
observers.Add(dummyB);
observers.Use(d => d.UsedCount++);
Assert.AreEqual(2, dummyA.UsedCount);
Assert.AreEqual(1, dummyB.UsedCount);
observers.Remove(dummyA);
observers.Use(d => d.UsedCount++);
Assert.AreEqual(2, dummyA.UsedCount);
Assert.AreEqual(2, dummyB.UsedCount);
}
/// <summary> /// Removes a subsystem observer. /// </summary> /// <param name="observer">The observer to remove.</param> /// <returns>The observer was successfully removed.</returns> /// <remarks>The observer will be immediately receive registration callbacks if the subsystem is currently active.</remarks> public static bool Unregister(IObserver <T> observer) => observers.Remove(observer);