/*
 * ArcEmu MMORPG Server
 * Copyright (C) 2008-2011 <http://www.ArcEmu.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef WOWSERVER_SINGLETON_H
#define WOWSERVER_SINGLETON_H

#include "common.h"

/// Should be placed in the appropriate .cpp file somewhere
#define initialiseSingleton( type ) \
  template <> type * Singleton < type > :: mSingleton = 0

#define initialiseTemplateSingleton( temp, type ) \
  template <> temp< type > * Singleton < temp< type > > :: mSingleton = 0

/// To be used as a replacement for initialiseSingleton( )
///  Creates a file-scoped Singleton object, to be retrieved with getSingleton
#define createFileSingleton( type ) \
  initialiseSingleton( type ); \
  type the##type

template < class type > class Singleton
{
	public:
		/// Constructor
		Singleton()
		{
			/// If you hit this assert, this singleton already exists -- you can't create another one!
			assert(this->mSingleton == 0);
			this->mSingleton = static_cast<type*>(this);
		}
		/// Destructor
		virtual ~Singleton()
		{
			this->mSingleton = 0;
		}

		inline static type & getSingleton() { assert(mSingleton); return *mSingleton; }
		inline static type* getSingletonPtr() { return mSingleton; }

	protected:

		/// Singleton pointer, must be set to 0 prior to creating the object
		static type* mSingleton;
};
#endif
