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OgreSingleton.h

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00001 /*
00002 -----------------------------------------------------------------------------
00003 This source file is part of OGRE
00004     (Object-oriented Graphics Rendering Engine)
00005 For the latest info, see http://www.ogre3d.org/
00006 
00007 Copyright (c) 2000-2006 Torus Knot Software Ltd
00008 Also see acknowledgements in Readme.html
00009 
00010 This program is free software; you can redistribute it and/or modify it under
00011 the terms of the GNU Lesser General Public License as published by the Free Software
00012 Foundation; either version 2 of the License, or (at your option) any later
00013 version.
00014 
00015 This program is distributed in the hope that it will be useful, but WITHOUT
00016 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
00017 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
00018 
00019 You should have received a copy of the GNU Lesser General Public License along with
00020 this program; if not, write to the Free Software Foundation, Inc., 59 Temple
00021 Place - Suite 330, Boston, MA 02111-1307, USA, or go to
00022 http://www.gnu.org/copyleft/lesser.txt.
00023 
00024 You may alternatively use this source under the terms of a specific version of
00025 the OGRE Unrestricted License provided you have obtained such a license from
00026 Torus Knot Software Ltd.
00027 -----------------------------------------------------------------------------
00028 */
00029 /* Original version Copyright (C) Scott Bilas, 2000.
00030  * All rights reserved worldwide.
00031  *
00032  * This software is provided "as is" without express or implied
00033  * warranties. You may freely copy and compile this source into
00034  * applications you distribute provided that the copyright text
00035  * below is included in the resulting source code, for example:
00036  * "Portions Copyright (C) Scott Bilas, 2000"
00037  */
00038 #ifndef _SINGLETON_H__
00039 #define _SINGLETON_H__
00040 
00041 // Added by Steve Streeting for Ogre
00042 #include "OgrePrerequisites.h"
00043 
00044 #if OGRE_COMPILER == OGRE_COMPILER_MSVC
00045 // Turn off warnings generated by this singleton implementation
00046 #   pragma warning (disable : 4311)
00047 #   pragma warning (disable : 4312)
00048 #endif
00049 
00050 namespace Ogre {
00051 // End SJS additions
00054     template <typename T> class Singleton
00055     {
00056     protected:
00057 
00058         static T* ms_Singleton;
00059 
00060     public:
00061         Singleton( void )
00062         {
00063             assert( !ms_Singleton );
00064 #if defined( _MSC_VER ) && _MSC_VER < 1200   
00065             int offset = (int)(T*)1 - (int)(Singleton <T>*)(T*)1;
00066             ms_Singleton = (T*)((int)this + offset);
00067 #else
00068         ms_Singleton = static_cast< T* >( this );
00069 #endif
00070         }
00071         ~Singleton( void )
00072             {  assert( ms_Singleton );  ms_Singleton = 0;  }
00073         static T& getSingleton( void )
00074         {   assert( ms_Singleton );  return ( *ms_Singleton ); }
00075         static T* getSingletonPtr( void )
00076         { return ms_Singleton; }
00077     };
00078 }
00079 #endif

Copyright © 2000-2005 by The OGRE Team
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Last modified Sun Mar 25 13:03:16 2007