00001 // Copyright (C) 2001 Open Source Telecom Corporation. 00002 // 00003 // This program is free software; you can redistribute it and/or modify 00004 // it under the terms of the GNU General Public License as published by 00005 // the Free Software Foundation; either version 2 of the License, or 00006 // (at your option) any later version. 00007 // 00008 // This program is distributed in the hope that it will be useful, 00009 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00010 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00011 // GNU General Public License for more details. 00012 // 00013 // You should have received a copy of the GNU General Public License 00014 // along with this program; if not, write to the Free Software 00015 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 00016 // 00017 // As a special exception to the GNU General Public License, permission is 00018 // granted for additional uses of the text contained in its release 00019 // of Common C++. 00020 // 00021 // The exception is that, if you link the Common C++ library with other 00022 // files to produce an executable, this does not by itself cause the 00023 // resulting executable to be covered by the GNU General Public License. 00024 // Your use of that executable is in no way restricted on account of 00025 // linking the Common C++ library code into it. 00026 // 00027 // This exception does not however invalidate any other reasons why 00028 // the executable file might be covered by the GNU General Public License. 00029 // 00030 // This exception applies only to the code released under the 00031 // name Common C++. If you copy code from other releases into a copy of 00032 // Common C++, as the General Public License permits, the exception does 00033 // not apply to the code that you add in this way. To avoid misleading 00034 // anyone as to the status of such modified files, you must delete 00035 // this exception notice from them. 00036 // 00037 // If you write modifications of your own for Common C++, it is your choice 00038 // whether to permit this exception to apply to your modifications. 00039 // If you do not wish that, delete this exception notice. 00040 00046 #include <cstddef> 00047 00048 namespace ost { 00049 00056 template <class T> 00057 class Pointer 00058 { 00059 protected: 00060 unsigned *ptrCount; 00061 T *ptrObject; 00062 00063 void ptrDetach(void) 00064 { 00065 if(ptrCount && --(*ptrCount)==0) { 00066 delete ptrObject; 00067 delete ptrCount; 00068 } 00069 ptrObject = NULL; 00070 ptrCount = NULL; 00071 } 00072 00073 public: 00074 explicit Pointer(T* ptr = NULL) : ptrObject(ptr) 00075 { 00076 ptrCount = new unsigned; 00077 *ptrCount = 1; 00078 } 00079 00080 Pointer(const Pointer<T> &ref) 00081 { 00082 ptrObject = ref.ptrObject; 00083 ptrCount = ref.ptrCount; 00084 ++(*ptrCount); 00085 } 00086 00087 inline virtual ~Pointer() 00088 {ptrDetach();} 00089 00090 00091 Pointer& operator=(const Pointer<T> &ref) 00092 { 00093 if(this != &ref) { 00094 ptrDetach(); 00095 ptrObject = ref.ptrObject; 00096 ptrCount = ref.ptrCount; 00097 ++(*ptrCount); 00098 } 00099 return *this; 00100 } 00101 00102 inline T& operator*() const 00103 {return *ptrObject;}; 00104 00105 inline T* getObject() const 00106 {return ptrObject;}; 00107 00108 inline T* operator->() const 00109 {return ptrObject;}; 00110 00111 inline bool operator!() const 00112 {return (*ptrCount == 1);}; 00113 00114 inline int operator++() const 00115 {return ++(*ptrCount);}; 00116 00117 int operator--() const 00118 { 00119 if(*ptrCount == 1) { 00120 delete this; 00121 return 0; 00122 } 00123 return --(*ptrCount); 00124 } 00125 }; 00126 00127 }