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00001 // Copyright (C) 2001-2005 Open Source Telecom Corporation. 00002 // Copyright (C) 2006-2014 David Sugar, Tycho Softworks. 00003 // 00004 // This program is free software; you can redistribute it and/or modify 00005 // it under the terms of the GNU General Public License as published by 00006 // the Free Software Foundation; either version 2 of the License, or 00007 // (at your option) any later version. 00008 // 00009 // This program is distributed in the hope that it will be useful, 00010 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00011 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00012 // GNU General Public License for more details. 00013 // 00014 // You should have received a copy of the GNU Lesser General Public License 00015 // along with this program. If not, see <http://www.gnu.org/licenses/>. 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 COMMONCPP_POINTER_H_ 00047 #define COMMONCPP_POINTER_H_ 00048 00049 #ifndef COMMONCPP_CONFIG_H_ 00050 #include <commoncpp/config.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 inline void ptrDetach(void) { 00069 if(ptrCount && --(*ptrCount)==0) { 00070 delete ptrObject; 00071 delete ptrCount; 00072 } 00073 ptrObject = NULL; 00074 ptrCount = NULL; 00075 } 00076 00077 public: 00078 inline explicit Pointer(T* ptr = NULL) : ptrObject(ptr) { 00079 ptrCount = new unsigned; 00080 *ptrCount = 1; 00081 } 00082 00083 inline Pointer(const Pointer<T> &ref) { 00084 ptrObject = ref.ptrObject; 00085 ptrCount = ref.ptrCount; 00086 ++(*ptrCount); 00087 } 00088 00089 inline virtual ~Pointer() 00090 {ptrDetach();} 00091 00092 00093 inline Pointer& operator=(const Pointer<T> &ref) { 00094 if(this != &ref) { 00095 ptrDetach(); 00096 ptrObject = ref.ptrObject; 00097 ptrCount = ref.ptrCount; 00098 ++(*ptrCount); 00099 } 00100 return *this; 00101 } 00102 00103 inline T& operator*() const 00104 {return *ptrObject;} 00105 00106 inline T* getObject() const 00107 {return ptrObject;} 00108 00109 inline T* operator->() const 00110 {return ptrObject;} 00111 00112 inline bool operator!() const 00113 {return (*ptrCount == 1);} 00114 00115 inline int operator++() const 00116 {return ++(*ptrCount);} 00117 00118 inline int operator--() const { 00119 if(*ptrCount == 1) { 00120 delete this; 00121 return 0; 00122 } 00123 return --(*ptrCount); 00124 } 00125 }; 00126 00127 } // namespace ost 00128 00129 #endif