/* -*- 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 */