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 #ifndef __SharedPtr_H__ 00026 #define __SharedPtr_H__ 00027 00028 #include "OgrePrerequisites.h" 00029 00030 namespace Ogre { 00031 00042 template<class T> class SharedPtr { 00043 protected: 00044 T* pRep; 00045 unsigned int* pUseCount; 00046 public: 00051 SharedPtr() : pRep(0), pUseCount(0) {} 00052 SharedPtr(T* rep) : pRep(rep), pUseCount(new unsigned int(1)) {} 00053 SharedPtr(const SharedPtr& r) : pRep(r.pRep), pUseCount(r.pUseCount) { 00054 // Handle zero pointer gracefully to manage STL containers 00055 if(pUseCount) 00056 { 00057 ++(*pUseCount); 00058 } 00059 } 00060 SharedPtr& operator=(const SharedPtr& r) { 00061 if (pRep == r.pRep) 00062 return *this; 00063 if (pUseCount) 00064 { 00065 if (--(*pUseCount) == 0) { 00066 destroy(); 00067 } 00068 } 00069 pRep = r.pRep; 00070 pUseCount = r.pUseCount; 00071 if (pUseCount) 00072 { 00073 ++(*pUseCount); 00074 } 00075 return *this; 00076 } 00077 virtual ~SharedPtr() { 00078 if(pUseCount) 00079 { 00080 if (--(*pUseCount) == 0) { 00081 destroy(); 00082 } 00083 } 00084 } 00085 00086 virtual void destroy(void) 00087 { 00088 delete pRep; 00089 delete pUseCount; 00090 } 00091 00092 00093 inline T& operator*() const { assert(pRep); return *pRep; } 00094 inline T* operator->() const { assert(pRep); return pRep; } 00095 inline T* get() const { assert(pRep); return pRep; } 00096 00101 void bind(T* rep) { 00102 assert(!pRep && !pUseCount); 00103 pUseCount = new unsigned int(1); 00104 pRep = rep; 00105 } 00106 00107 inline bool unique() const { assert(pUseCount); return *pUseCount == 1; } 00108 inline unsigned int useCount() const { assert(pUseCount); return *pUseCount; } 00109 00110 inline T* getPointer() { assert(pRep); return pRep; } 00111 00112 inline bool isNull(void) const { return pRep == 0; } 00113 }; 00114 00115 template<class T, class U> inline bool operator==(SharedPtr<T> const& a, SharedPtr<U> const& b) 00116 { 00117 return a.get() == b.get(); 00118 } 00119 00120 template<class T, class U> inline bool operator!=(SharedPtr<T> const& a, SharedPtr<U> const& b) 00121 { 00122 return a.get() != b.get(); 00123 } 00124 00125 } 00126 00127 #endif
Copyright © 2002-2003 by The OGRE Team
Last modified Wed Jan 21 00:10:28 2004