/*
 * Copyright (C) 2015 by Multi-Tech Systems
 *
 * This file is part of libmts.
 *
 * libmts is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * libmts 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with libmts.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

/*! \file MTS_Singleton.h
 \brief A Documented file.    
 \date 2011-06-20
 \author Sean Godinez

 Details.
 */

#ifndef _MTS_SINGLETON_H_
#define _MTS_SINGLETON_H_

#include <mts/MTS_Lock.h>

namespace MTS {

    template<class T> class Singleton {

        public:

            static T* instance();

        protected:

        private:
            static T* m_pInstance;
            static AutoPtr<Lock> m_apLock;

            // Do Not Allow Use of Any Constructor or Assignment Operator
            Singleton() {
            }
            ~Singleton();
            Singleton(const Singleton&);
            Singleton& operator=(const Singleton&);
    };

    template<class T> Singleton<T>::~Singleton() {
        m_apLock.reset();
        delete T;
    }

    template<class T> T* Singleton<T>::instance() {

        m_apLock->lock();
        if (m_pInstance == NULL) {
            m_pInstance = new T();
        }
        m_apLock->unlock();

        return m_pInstance;
    }

    //FIXME: Template Initialization
    template<class T> static AutoPtr<Lock> Singleton<T>::m_apLock.reset(new Lock());
    template<class T> static T* Singleton<T>::m_pInstance = NULL;
}

#endif /* MTS_SINGLETON_H_ */