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  1. /***************************************************************************
  2.  *   Copyright (C) January 5, 2009 by Mattias Runge                             *
  3.  *   mattias@runge.se                                                      *
  4.  *   singleton.h                                            *
  5.  *                                                                         *
  6.  *   This program is free software; you can redistribute it and/or modify  *
  7.  *   it under the terms of the GNU General Public License as published by  *
  8.  *   the Free Software Foundation; either version 2 of the License, or     *
  9.  *   (at your option) any later version.                                   *
  10.  *                                                                         *
  11.  *   This program is distributed in the hope that it will be useful,       *
  12.  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  13.  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  14.  *   GNU General Public License for more details.                          *
  15.  *                                                                         *
  16.  *   You should have received a copy of the GNU General Public License     *
  17.  *   along with this program; if not, write to the                         *
  18.  *   Free Software Foundation, Inc.,                                       *
  19.  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  20.  ***************************************************************************/
  21.  
  22. #ifndef _SINGLETON_H
  23. #define _SINGLETON_H
  24.  
  25. #include <stdlib.h>
  26.  
  27. template <class T>
  28. class Singleton
  29. {
  30. public:
  31.     static T& getInstance()
  32.     {
  33.         if (myInstance == NULL)
  34.         {
  35.             myInstance = new T();
  36.         }
  37.  
  38.         return *myInstance;
  39.     }
  40.  
  41.     static void deleteInstance()
  42.     {
  43.         if (myInstance != NULL)
  44.         {
  45.             delete myInstance;
  46.             myInstance = NULL;
  47.         }
  48.     }
  49.  
  50. protected:
  51.     Singleton();
  52.     ~Singleton();
  53.     static T* myInstance;
  54. };
  55.  
  56. #endif  /* _SINGLETON_H */
  57.  
  58.