singleton.h

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/*
 * Copyright (c) 2007 INRIA
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
 */
#ifndef SINGLETON_H
#define SINGLETON_H
 
namespace ns3
{
 
template <typename T>
class Singleton
{
  public:
    // Delete copy constructor and assignment operator to avoid misuse
    Singleton<T>(const Singleton<T>&) = delete;
    Singleton<T>& operator=(const Singleton<T>&) = delete;
 
    static T* Get();
 
  protected:
    Singleton<T>()
    {
    }
 
    virtual ~Singleton<T>()
    {
    }
};
 
} // namespace ns3
 
/********************************************************************
 *  Implementation of the templates declared above.
 ********************************************************************/
 
namespace ns3
{
 
template <typename T>
T*
Singleton<T>::Get()
{
    static T object;
    return &object;
}
 
} // namespace ns3
 
#endif /* SINGLETON_H */