Singleton abstract class for unity.

Singleton.cs

using UnityEngine;
using System.Collections;

/// <summary>
/// MONOBEHAVIOR PSEUDO SINGLETON ABSTRACT CLASS
/// usage	: best is to be attached to a gameobject but if not that is ok,
/// 		: this will create one on first access
/// example	: '''public sealed class MyClass : Singleton<MyClass> {'''
/// references	: http://tinyurl.com/d498g8c
/// 		: http://tinyurl.com/cc73a9h
/// 		: http://unifycommunity.com/wiki/index.php?title=Singleton
/// </summary>
public abstract class Singleton<T> : MonoBehaviour where T : MonoBehaviour
{

	private static T _instance = null;
	
	public static bool IsAwake { get { return (_instance != null); } }
			
	/// <summary>
	/// gets the instance of this Singleton
	/// use this for all instance calls:
	/// MyClass.Instance.MyMethod();
	/// or make your public methods static
	/// and have them use Instance
	/// </summary>
	public static T Instance {
		get {
			if (_instance == null) {
				_instance = (T)FindObjectOfType (typeof(T));
				if (_instance == null) {
					
					string goName = typeof(T).ToString ();			
					
					GameObject go = GameObject.Find (goName);
					if (go == null) {
						go = new GameObject ();
						go.name = goName;
					}
					
					_instance = go.AddComponent<T> ();					
				}
			}
			return _instance;
		}
	}
	
	/// <summary>
	/// for garbage collection
	/// </summary>
	public virtual void OnApplicationQuit ()
	{
		// release reference on exit
		_instance = null;
	}
	
	// in your child class you can implement Awake()
	// and add any initialization code you want such as
	// DontDestroyOnLoad(go);
	// if you want this to persist across loads
	// or if you want to set a parent object with SetParent()
	
	/// <summary>
	/// parent this to another gameobject by string
	/// call from Awake if you so desire
	/// </summary>
	protected void SetParent (string parentGOName)
	{
		if (parentGOName != null) {
			GameObject parentGO = GameObject.Find (parentGOName);
			if (parentGO == null) {
				parentGO = new GameObject ();
				parentGO.name = parentGOName;
			}
			this.transform.parent = parentGO.transform;
		}
	}
}