/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */

/*

 * 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 {

/**

 * \brief a template singleton

 *

 * This template class can be used to implement the singleton pattern.

 * The underlying object will be destroyed automatically when the process

 * exits. Note that, if you call Singleton::Get again after the object has

 * been destroyed, the object will be re-created which will result in a

 * memory leak as reported by most memory leak checkers. It is up to the

 * user to ensure that Singleton::Get is never called from a static variable

 * finalizer.

 */

template <typename T>

class Singleton

{

public:

  static T *Get (void);

};

} // namespace ns3

namespace ns3 {

template <typename T>

T *

Singleton<T>::Get (void)

{

  static T object;

  return &object;

}

} // namespace ns3

#endif /* SINGLETON_H */