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CEGUISingleton.h

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00001 /************************************************************************
00002         filename:       CEGUISingleton.h
00003         created:        22/2/2004
00004         author:         Paul D Turner
00005         
00006         purpose:        Singleton Base Class
00007 *************************************************************************/
00008 /*************************************************************************
00009     Crazy Eddie's GUI System (http://www.cegui.org.uk)
00010     Copyright (C)2004 - 2005 Paul D Turner (paul@cegui.org.uk)
00011 
00012     This library is free software; you can redistribute it and/or
00013     modify it under the terms of the GNU Lesser General Public
00014     License as published by the Free Software Foundation; either
00015     version 2.1 of the License, or (at your option) any later version.
00016 
00017     This library is distributed in the hope that it will be useful,
00018     but WITHOUT ANY WARRANTY; without even the implied warranty of
00019     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00020     Lesser General Public License for more details.
00021 
00022     You should have received a copy of the GNU Lesser General Public
00023     License along with this library; if not, write to the Free Software
00024     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00025 *************************************************************************/
00026 /*************************************************************************
00027         
00028         The code in this file is taken from article 1.3 in the the book:
00029         Game Programming Gems from Charles River Media
00030 
00031 *************************************************************************/
00032 #ifndef _CEGUISingleton_h_
00033 #define _CEGUISingleton_h_
00034 
00035 #include "CEGUIBase.h"
00036 #include <cassert>
00037 
00038 // Start of CEGUI namespace section
00039 namespace CEGUI
00040 {
00041 /* Copyright (C) Scott Bilas, 2000. 
00042  * All rights reserved worldwide.
00043  *
00044  * This software is provided "as is" without express or implied
00045  * warranties. You may freely copy and compile this source into
00046  * applications you distribute provided that the copyright text
00047  * below is included in the resulting source code, for example:
00048  * "Portions Copyright (C) Scott Bilas, 2000"
00049  */
00050 
00051 
00052 template <typename T> class CEGUIBASE_API Singleton
00053 {
00054 protected:
00055     static T* ms_Singleton;
00056 
00057 public:
00058     Singleton( void )
00059     {
00060         assert( !ms_Singleton );
00061         int offset = (int)(T*)1 - (int)(Singleton <T>*)(T*)1;
00062         ms_Singleton = (T*)((int)this + offset);
00063     }
00064    ~Singleton( void )
00065         {  assert( ms_Singleton );  ms_Singleton = 0;  }
00066     static T& getSingleton( void )
00067         {  assert( ms_Singleton );  return ( *ms_Singleton );  }
00068     static T* getSingletonPtr( void )
00069         {  return ( ms_Singleton );  }
00070 };
00071 
00072 } // End of  CEGUI namespace section
00073 
00074 
00075 
00076 #endif  // end of guard _CEGUISingleton_h_

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