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 #ifndef CCXX_MISSING_H_ 00047 #include <cc++/missing.h> 00048 #endif 00049 00050 namespace ost { 00051 00058 template <class T> 00059 class Pointer 00060 { 00061 protected: 00062 unsigned *ptrCount; 00063 T *ptrObject; 00064 00065 void ptrDetach(void) 00066 { 00067 if(ptrCount && --(*ptrCount)==0) { 00068 delete ptrObject; 00069 delete ptrCount; 00070 } 00071 ptrObject = NULL; 00072 ptrCount = NULL; 00073 } 00074 00075 public: 00076 explicit Pointer(T* ptr = NULL) : ptrObject(ptr) 00077 { 00078 ptrCount = new unsigned; 00079 *ptrCount = 1; 00080 } 00081 00082 Pointer(const Pointer<T> &ref) 00083 { 00084 ptrObject = ref.ptrObject; 00085 ptrCount = ref.ptrCount; 00086 ++(*ptrCount); 00087 } 00088 00089 inline virtual ~Pointer() 00090 {ptrDetach();} 00091 00092 00093 Pointer& operator=(const Pointer<T> &ref) 00094 { 00095 if(this != &ref) { 00096 ptrDetach(); 00097 ptrObject = ref.ptrObject; 00098 ptrCount = ref.ptrCount; 00099 ++(*ptrCount); 00100 } 00101 return *this; 00102 } 00103 00104 inline T& operator*() const 00105 {return *ptrObject;}; 00106 00107 inline T* getObject() const 00108 {return ptrObject;}; 00109 00110 inline T* operator->() const 00111 {return ptrObject;}; 00112 00113 inline bool operator!() const 00114 {return (*ptrCount == 1);}; 00115 00116 inline int operator++() const 00117 {return ++(*ptrCount);}; 00118 00119 int operator--() const 00120 { 00121 if(*ptrCount == 1) { 00122 delete this; 00123 return 0; 00124 } 00125 return --(*ptrCount); 00126 } 00127 }; 00128 00129 }