/*

	Singleton?MonoBehaviour

	Generic?Unity?MonoBehaviour?Singleton

	Usage:
		public?class?MusicManager?:?SingletonMonobehaviour?{
			public?void?PlaySong（string?name）?{}
		}

	To?survive?scene?loads?use?DontDestroyonload（this）?in?subclasses?or?use?SingletonMonobehaviourNoDestroy.
	nb.?this?ONLY?works?if?any?parents?of?the?gameobject?aren‘t?themselves?destroyed!?ie.?should?be?at?root?level?or?nested?in?another?non-destructible?gameobject.

	Updated?24/5/2015
	Copyright?Flightless?2014.?All?rights?reserved.

*/

using?UnityEngine;
using?System.Collections.Generic;

namespace?Flightless?{
		
	public?abstract?class?SingletonMonoBehaviour?:?MonoBehaviour?where?T?:?SingletonMonoBehaviour?{

		private?static?T?_instance;
		public?static?T?instance?{?get?{?return?_instance????（!isApplicationQuitting???new?Gameobject（“_“?+?typeof（T））.AddComponent（）?:?null?）;?}?}
		public?static?T?CreateInstance（）?{?return?instance;?}
		public?static?bool?hasInstance?{?get?{?return?_instance?!=?null;?}?}

		public?static?bool?isApplicationQuitting?{?get;?protected?set;?}


		virtual?protected?void?Awake（）?{
			if?（_instance?!=?null）?{
				Debug.LogError（name?+?“.Awake（）?error:?already?initialised?as?“?+?_instance.name）;
				Destroy（gameobject）;
				return;
			}

			_instance?=?（T）this;
			Initialise（）;
		}
		
		virtual?protected?void?Initialise（）?{}

		virtual?protected?void?OnApplicationQuit（）?{
			isApplicationQuitting?=?true;
		}

		virtual?protected?void?OnDestroy（）?{
			if?（_instance?==?this）?_instance?=?null;
		}
	}


	public?abstract?class?SingletonMonoBehaviourNoDestroy?:?SingletonMonoBehaviour?where?T?:?SingletonMonoBehaviourNoDestroy?{

		override?protected?void?Awake（）?{
			base.Awake（）;
			DontDestroyonload（gameobject）;
		}
	}
}