singleton.h

00001 /***************************************************************************
00002  *   Copyright (C) 2005-2008 by the FIFE team                              *
00003  *   http://www.fifengine.de                                               *
00004  *   This file is part of FIFE.                                            *
00005  *                                                                         *
00006  *   FIFE is free software; you can redistribute it and/or                 *
00007  *   modify it under the terms of the GNU Lesser General Public            *
00008  *   License as published by the Free Software Foundation; either          *
00009  *   version 2.1 of the License, or (at your option) any later version.    *
00010  *                                                                         *
00011  *   This library is distributed in the hope that it will be useful,       *
00012  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
00013  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU     *
00014  *   Lesser General Public License for more details.                       *
00015  *                                                                         *
00016  *   You should have received a copy of the GNU Lesser General Public      *
00017  *   License along with this library; if not, write to the                 *
00018  *   Free Software Foundation, Inc.,                                       *
00019  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA          *
00020  ***************************************************************************/
00021 
00022 #ifndef FIFE_SINGLETON_H
00023 #define FIFE_SINGLETON_H
00024 
00025 #define SINGLEFRIEND(classname) friend class FIFE::StaticSingleton<classname>; classname(); virtual ~classname();
00026 
00027 // Standard C++ library includes
00028 #include <cassert>
00029 
00030 // 3rd party library includes
00031 
00032 // FIFE includes
00033 // These includes are split up in two parts, separated by one empty line
00034 // First block: files included from the FIFE root src directory
00035 // Second block: files included from the same folder
00036 #include "fifeclass.h"
00037 
00038 namespace FIFE {
00039 
00044     template <typename T> class StaticSingleton: public FifeClass {
00045         public:
00046 
00047             static T* instance() {
00048                 static T inst;
00049                 return &inst;
00050             }
00051 
00052         protected:
00053 
00054             StaticSingleton(): FifeClass() {
00055             }
00056 
00057             virtual ~StaticSingleton() {
00058             }
00059 
00060         private:
00061             StaticSingleton(const StaticSingleton<T>&): FifeClass() {}
00062             StaticSingleton<T>& operator=(const StaticSingleton<T>&) {
00063                 return this;
00064             }
00065 
00066     };
00067 
00082     template <typename T> class DynamicSingleton: public FifeClass {
00083         public:
00084             static T* instance() {
00085                 assert(m_instance);
00086                 return m_instance;
00087             }
00088 
00089             DynamicSingleton(): FifeClass() {
00090                 assert(!m_instance);
00091                 m_instance = static_cast<T*>(this);
00092             }
00093 
00094             virtual ~DynamicSingleton() {
00095                 m_instance = 0;
00096             }
00097 
00098         private:
00099             static T* m_instance;
00100 
00101             DynamicSingleton(const DynamicSingleton<T>&): FifeClass() {};
00102             DynamicSingleton<T&> operator=(const DynamicSingleton<T>&) {};
00103 
00104     };
00105 
00106     template <typename T> T* DynamicSingleton<T>::m_instance = 0;
00107 
00108 }//FIFE
00109 
00110 #endif
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