00001 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */ 00002 /* 00003 * Copyright (c) 2007 INRIA 00004 * 00005 * This program is free software; you can redistribute it and/or modify 00006 * it under the terms of the GNU General Public License version 2 as 00007 * published by the Free Software Foundation; 00008 * 00009 * This program is distributed in the hope that it will be useful, 00010 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00012 * GNU General Public License for more details. 00013 * 00014 * You should have received a copy of the GNU General Public License 00015 * along with this program; if not, write to the Free Software 00016 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 00017 * 00018 * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr> 00019 */ 00020 #ifndef SINGLETON_H 00021 #define SINGLETON_H 00022 00023 namespace ns3 { 00024 00025 /** 00026 * \brief a template singleton 00027 * 00028 * This template class can be used to implement the singleton pattern. 00029 * The underlying object will be destroyed automatically when the process 00030 * exits. Note that, if you call Singleton::Get again after the object has 00031 * been destroyed, the object will be re-created which will result in a 00032 * memory leak as reported by most memory leak checkers. It is up to the 00033 * user to ensure that Singleton::Get is never called from a static variable 00034 * finalizer. 00035 */ 00036 template <typename T> 00037 class Singleton 00038 { 00039 public: 00040 static T *Get (void); 00041 00042 }; 00043 00044 } // namespace ns3 00045 00046 namespace ns3 { 00047 00048 template <typename T> 00049 T * 00050 Singleton<T>::Get (void) 00051 { 00052 static T object; 00053 return &object; 00054 } 00055 00056 00057 } // namespace ns3 00058 00059 #endif /* SINGLETON_H */