◆ Null

readonly NullComparer Sisus.NullExtensions.Null = new NullComparer()

static

A value against which any object can be compared to determine whether it is null or an Object which has been destroyed.

using static Sisus.NullExtensions;
 
public class EventListener : MonoBehaviour{IEvent}, IEventListener
{
    private IEvent trigger;
 
    protected override void Init(IEventBroadcaster trigger)
    {
        this.trigger = trigger;
    }
 
    private void OnEnable()
    {
        trigger.AddListener(this);
    }
 
    private void OnEvent()
    {
        Debug.Log($"{name} heard event {trigger}.");
    }
 
    private void OnDisable()
    {
        if(trigger != Null)
        {
            trigger.RemoveListener(this);
        }
    }
}