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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) 2000-2005 The OGRE Team
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 */
00025 /* Original version Copyright (C) Scott Bilas, 2000.
00026  * All rights reserved worldwide.
00027  *
00028  * This software is provided "as is" without express or implied
00029  * warranties. You may freely copy and compile this source into
00030  * applications you distribute provided that the copyright text
00031  * below is included in the resulting source code, for example:
00032  * "Portions Copyright (C) Scott Bilas, 2000"
00033  */
00034 #ifndef _SINGLETON_H__
00035 #define _SINGLETON_H__
00036 
00037 // Added by Steve Streeting for Ogre
00038 #include "OgrePrerequisites.h"
00039 
00040 #if OGRE_COMPILER == OGRE_COMPILER_MSVC
00041 // Turn off warnings generated by this singleton implementation
00042 #   pragma warning (disable : 4311)
00043 #   pragma warning (disable : 4312)
00044 #endif
00045 
00046 namespace Ogre {
00047 // End SJS additions
00050     template <typename T> class Singleton
00051     {
00052     protected:
00053 
00054         static T* ms_Singleton;
00055 
00056     public:
00057         Singleton( void )
00058         {
00059             assert( !ms_Singleton );
00060 #if defined( _MSC_VER ) && _MSC_VER < 1200   
00061             int offset = (int)(T*)1 - (int)(Singleton <T>*)(T*)1;
00062             ms_Singleton = (T*)((int)this + offset);
00063 #else
00064         ms_Singleton = static_cast< T* >( this );
00065 #endif
00066         }
00067         ~Singleton( void )
00068             {  assert( ms_Singleton );  ms_Singleton = 0;  }
00069         static T& getSingleton( void )
00070         {   assert( ms_Singleton );  return ( *ms_Singleton ); }
00071         static T* getSingletonPtr( void )
00072         { return ms_Singleton; }
00073     };
00074 }
00075 #endif

Copyright © 2000-2005 by The OGRE Team
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Last modified Sun Mar 12 14:37:50 2006