GNU CommonC++
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00001 // Copyright (C) 2001-2005 Open Source Telecom Corporation. 00002 // Copyright (C) 2006-2010 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 #ifdef CCXX_NAMESPACES 00055 namespace ost { 00056 #endif 00057 00064 template <class T> 00065 class Pointer 00066 { 00067 protected: 00068 unsigned *ptrCount; 00069 T *ptrObject; 00070 00071 void ptrDetach(void) 00072 { 00073 if(ptrCount && --(*ptrCount)==0) { 00074 delete ptrObject; 00075 delete ptrCount; 00076 } 00077 ptrObject = NULL; 00078 ptrCount = NULL; 00079 } 00080 00081 public: 00082 explicit Pointer(T* ptr = NULL) : ptrObject(ptr) 00083 { 00084 ptrCount = new unsigned; 00085 *ptrCount = 1; 00086 } 00087 00088 Pointer(const Pointer<T> &ref) 00089 { 00090 ptrObject = ref.ptrObject; 00091 ptrCount = ref.ptrCount; 00092 ++(*ptrCount); 00093 } 00094 00095 inline virtual ~Pointer() 00096 {ptrDetach();} 00097 00098 00099 Pointer& operator=(const Pointer<T> &ref) 00100 { 00101 if(this != &ref) { 00102 ptrDetach(); 00103 ptrObject = ref.ptrObject; 00104 ptrCount = ref.ptrCount; 00105 ++(*ptrCount); 00106 } 00107 return *this; 00108 } 00109 00110 inline T& operator*() const 00111 {return *ptrObject;}; 00112 00113 inline T* getObject() const 00114 {return ptrObject;}; 00115 00116 inline T* operator->() const 00117 {return ptrObject;}; 00118 00119 inline bool operator!() const 00120 {return (*ptrCount == 1);}; 00121 00122 inline int operator++() const 00123 {return ++(*ptrCount);}; 00124 00125 int operator--() const 00126 { 00127 if(*ptrCount == 1) { 00128 delete this; 00129 return 0; 00130 } 00131 return --(*ptrCount); 00132 } 00133 }; 00134 00135 #ifdef CCXX_NAMESPACES 00136 } 00137 #endif 00138 00139 #endif