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 #if defined ( OGRE_GCC_VISIBILITY )
00051 #   pragma GCC visibility push(default)
00052 #endif
00053 namespace Ogre {
00054 // End SJS additions
00057     template <typename T> class Singleton
00058     {
00059     protected:
00060 
00061         static T* ms_Singleton;
00062 
00063     public:
00064         Singleton( void )
00065         {
00066             assert( !ms_Singleton );
00067 #if defined( _MSC_VER ) && _MSC_VER < 1200   
00068             int offset = (int)(T*)1 - (int)(Singleton <T>*)(T*)1;
00069             ms_Singleton = (T*)((int)this + offset);
00070 #else
00071         ms_Singleton = static_cast< T* >( this );
00072 #endif
00073         }
00074         ~Singleton( void )
00075             {  assert( ms_Singleton );  ms_Singleton = 0;  }
00076         static T& getSingleton( void )
00077         {   assert( ms_Singleton );  return ( *ms_Singleton ); }
00078         static T* getSingletonPtr( void )
00079         { return ms_Singleton; }
00080     };
00081 }
00082 #if defined ( OGRE_GCC_VISIBILITY )
00083 #   pragma GCC visibility pop
00084 #endif
00085 #endif

Copyright © 2008 Torus Knot Software Ltd
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Last modified Sun Sep 27 22:02:26 2009