00001 // Copyright (C) 2001-2005 Open Source Telecom Corporation. 00002 // Copyright (C) 2006-2008 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 General Public License 00015 // along with this program; if not, write to the Free Software 00016 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 00017 // 00018 // As a special exception to the GNU General Public License, permission is 00019 // granted for additional uses of the text contained in its release 00020 // of Common C++. 00021 // 00022 // The exception is that, if you link the Common C++ library with other 00023 // files to produce an executable, this does not by itself cause the 00024 // resulting executable to be covered by the GNU General Public License. 00025 // Your use of that executable is in no way restricted on account of 00026 // linking the Common C++ library code into it. 00027 // 00028 // This exception does not however invalidate any other reasons why 00029 // the executable file might be covered by the GNU General Public License. 00030 // 00031 // This exception applies only to the code released under the 00032 // name Common C++. If you copy code from other releases into a copy of 00033 // Common C++, as the General Public License permits, the exception does 00034 // not apply to the code that you add in this way. To avoid misleading 00035 // anyone as to the status of such modified files, you must delete 00036 // this exception notice from them. 00037 // 00038 // If you write modifications of your own for Common C++, it is your choice 00039 // whether to permit this exception to apply to your modifications. 00040 // If you do not wish that, delete this exception notice. 00041 00047 #ifndef CCXX_POINTER_H_ 00048 #define CCXX_POINTER_H_ 00049 00050 #ifndef CCXX_MISSING_H_ 00051 #include <cc++/missing.h> 00052 #endif 00053 00054 namespace ost { 00055 00062 template <class T> 00063 class Pointer 00064 { 00065 protected: 00066 unsigned *ptrCount; 00067 T *ptrObject; 00068 00069 void ptrDetach(void) 00070 { 00071 if(ptrCount && --(*ptrCount)==0) { 00072 delete ptrObject; 00073 delete ptrCount; 00074 } 00075 ptrObject = NULL; 00076 ptrCount = NULL; 00077 } 00078 00079 public: 00080 explicit Pointer(T* ptr = NULL) : ptrObject(ptr) 00081 { 00082 ptrCount = new unsigned; 00083 *ptrCount = 1; 00084 } 00085 00086 Pointer(const Pointer<T> &ref) 00087 { 00088 ptrObject = ref.ptrObject; 00089 ptrCount = ref.ptrCount; 00090 ++(*ptrCount); 00091 } 00092 00093 inline virtual ~Pointer() 00094 {ptrDetach();} 00095 00096 00097 Pointer& operator=(const Pointer<T> &ref) 00098 { 00099 if(this != &ref) { 00100 ptrDetach(); 00101 ptrObject = ref.ptrObject; 00102 ptrCount = ref.ptrCount; 00103 ++(*ptrCount); 00104 } 00105 return *this; 00106 } 00107 00108 inline T& operator*() const 00109 {return *ptrObject;}; 00110 00111 inline T* getObject() const 00112 {return ptrObject;}; 00113 00114 inline T* operator->() const 00115 {return ptrObject;}; 00116 00117 inline bool operator!() const 00118 {return (*ptrCount == 1);}; 00119 00120 inline int operator++() const 00121 {return ++(*ptrCount);}; 00122 00123 int operator--() const 00124 { 00125 if(*ptrCount == 1) { 00126 delete this; 00127 return 0; 00128 } 00129 return --(*ptrCount); 00130 } 00131 }; 00132 00133 } 00134 00135 #endif