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_POINTER_H_ 00047 #define CCXX_POINTER_H_ 00048 00049 #ifndef CCXX_MISSING_H_ 00050 #include <cc++/missing.h> 00051 #endif 00052 00053 namespace ost { 00054 00061 template <class T> 00062 class Pointer 00063 { 00064 protected: 00065 unsigned *ptrCount; 00066 T *ptrObject; 00067 00068 void ptrDetach(void) 00069 { 00070 if(ptrCount && --(*ptrCount)==0) { 00071 delete ptrObject; 00072 delete ptrCount; 00073 } 00074 ptrObject = NULL; 00075 ptrCount = NULL; 00076 } 00077 00078 public: 00079 explicit Pointer(T* ptr = NULL) : ptrObject(ptr) 00080 { 00081 ptrCount = new unsigned; 00082 *ptrCount = 1; 00083 } 00084 00085 Pointer(const Pointer<T> &ref) 00086 { 00087 ptrObject = ref.ptrObject; 00088 ptrCount = ref.ptrCount; 00089 ++(*ptrCount); 00090 } 00091 00092 inline virtual ~Pointer() 00093 {ptrDetach();} 00094 00095 00096 Pointer& operator=(const Pointer<T> &ref) 00097 { 00098 if(this != &ref) { 00099 ptrDetach(); 00100 ptrObject = ref.ptrObject; 00101 ptrCount = ref.ptrCount; 00102 ++(*ptrCount); 00103 } 00104 return *this; 00105 } 00106 00107 inline T& operator*() const 00108 {return *ptrObject;}; 00109 00110 inline T* getObject() const 00111 {return ptrObject;}; 00112 00113 inline T* operator->() const 00114 {return ptrObject;}; 00115 00116 inline bool operator!() const 00117 {return (*ptrCount == 1);}; 00118 00119 inline int operator++() const 00120 {return ++(*ptrCount);}; 00121 00122 int operator--() const 00123 { 00124 if(*ptrCount == 1) { 00125 delete this; 00126 return 0; 00127 } 00128 return --(*ptrCount); 00129 } 00130 }; 00131 00132 } 00133 00134 #endif