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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 © 2000-2002 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 == 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 © 2002-2003 by The OGRE Team
Last modified Sun Nov 28 19:48:47 2004