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CEGUISingleton.h

00001 /***********************************************************************
00002         filename:       CEGUISingleton.h
00003         created:        22/2/2004
00004         author:         Paul D Turner
00005 
00006         purpose:        Singleton Base Class
00007 *************************************************************************/
00008 /***************************************************************************
00009  *   Copyright (C) 2004 - 2006 Paul D Turner & The CEGUI Development Team
00010  *
00011  *   Permission is hereby granted, free of charge, to any person obtaining
00012  *   a copy of this software and associated documentation files (the
00013  *   "Software"), to deal in the Software without restriction, including
00014  *   without limitation the rights to use, copy, modify, merge, publish,
00015  *   distribute, sublicense, and/or sell copies of the Software, and to
00016  *   permit persons to whom the Software is furnished to do so, subject to
00017  *   the following conditions:
00018  *
00019  *   The above copyright notice and this permission notice shall be
00020  *   included in all copies or substantial portions of the Software.
00021  *
00022  *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
00023  *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00024  *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
00025  *   IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
00026  *   OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
00027  *   ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
00028  *   OTHER DEALINGS IN THE SOFTWARE.
00029  ***************************************************************************/
00030 /*************************************************************************
00031 
00032         The code in this file is taken from article 1.3 in the the book:
00033         Game Programming Gems from Charles River Media
00034 
00035 *************************************************************************/
00036 #ifndef _CEGUISingleton_h_
00037 #define _CEGUISingleton_h_
00038 
00039 #include "CEGUIBase.h"
00040 #include <cassert>
00041 
00042 // Start of CEGUI namespace section
00043 namespace CEGUI
00044 {
00045 /* Copyright (C) Scott Bilas, 2000.
00046  * All rights reserved worldwide.
00047  *
00048  * This software is provided "as is" without express or implied
00049  * warranties. You may freely copy and compile this source into
00050  * applications you distribute provided that the copyright text
00051  * below is included in the resulting source code, for example:
00052  * "Portions Copyright (C) Scott Bilas, 2000"
00053  */
00054 
00055 
00056 template <typename T> class CEGUIEXPORT Singleton
00057 {
00058 protected:
00059 // TODO: Come up with something better than this!
00060 // TODO:
00061 // TODO: This super-nasty piece of nastiness was put in for continued
00062 // TODO: compatability with MSVC++ and MinGW - the latter apparently
00063 // TODO: needs this.
00064     static
00065 #ifdef __MINGW32__
00066     CEGUIEXPORT
00067 #endif
00068     T* ms_Singleton;
00069 
00070 public:
00071     Singleton( void )
00072     {
00073         assert( !ms_Singleton );
00074         ms_Singleton = static_cast<T*>(this);
00075     }
00076    ~Singleton( void )
00077         {  assert( ms_Singleton );  ms_Singleton = 0;  }
00078     static T& getSingleton( void )
00079         {  assert( ms_Singleton );  return ( *ms_Singleton );  }
00080     static T* getSingletonPtr( void )
00081         {  return ( ms_Singleton );  }
00082 
00083 private:
00084     Singleton& operator=(const Singleton&) { return this; }
00085     Singleton(const Singleton&) {}
00086 };
00087 
00088 } // End of  CEGUI namespace section
00089 
00090 
00091 
00092 #endif  // end of guard _CEGUISingleton_h_

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