Main.cs

using UnityEngine;

namespace Uzu
{
	/// <summary>
	/// The application main entry point.
	/// This object is guaranteed to exist at all times.
	/// </summary>
	public class Main : BaseBehaviour
	{
		/// <summary>
		/// Override this to load application resources.
		/// </summary>
		protected virtual void OnMainBegin ()
		{
		}
		/// <summary>
		/// Override this to provide any application-specific startup logic.
		/// </summary>
		protected virtual void OnMainBegin2 ()
		{
		}
		/// <summary>
		/// Override this to provide any application-specific cleanup logic.
		/// </summary>
		protected virtual void OnMainEnd ()
		{
		}
	
		#region Implementation.
		#region Singleton implementation.
		private static Main _instance;

		protected static Main Instance {
			get { return _instance; }
			private set { Uzu.Util.SingletonSet<Main> (ref _instance, value); }
		}
		#endregion
		
		protected override void Awake ()
		{
			base.Awake ();
			
			// Only allow single instance to exist.
			if (_instance != null && _instance != this) {
				Destroy (gameObject);
				return;
			}
			
			Instance = this;
			DontDestroyOnLoad (gameObject);
			
			// Invoke main.
			OnMainBegin ();
		}
		
		private void Start ()
		{
			// Invoke main.
			OnMainBegin2 ();
		}
		
		protected void OnDestroy ()
		{
			if (_instance != this) {
				return;
			}
			
			// Cleanup.
			OnMainEnd ();
			
			Instance = null;
		}
		#endregion
	}
}