singleton.h

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/* -*- 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 {
 
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 (void);
 
protected:
  Singleton<T> ()
  {
  }
 
  virtual ~Singleton<T> ()
  {
  }
};
 
} // namespace ns3
 
 
/********************************************************************
 *  Implementation of the templates declared above.
 ********************************************************************/
 
namespace ns3 {
 
template <typename T>
T *
Singleton<T>::Get (void)
{
  static T object;
  return &object;
}
 
 
} // namespace ns3
 
#endif /* SINGLETON_H */