using UnityEngine;

namespace Cryville.Common.Unity {
	public abstract class SingletonBehaviour<TSelf> : MonoBehaviour where TSelf : SingletonBehaviour<TSelf> {
		static TSelf s_instance;
		public static TSelf Instance {
			get {
				return s_instance;
			}
		}
		bool _validInstance;
		protected virtual void Awake() {
			if (s_instance != null) {
				Debug.LogErrorFormat("Duplicate singleton behaviour {0}", typeof(TSelf));
				Destroy(gameObject);
				return;
			}
			s_instance = (TSelf)this;
			_validInstance = true;
		}
		protected virtual void OnDestroy() {
			if (_validInstance) s_instance = null;
		}
	}
}