pointer.h

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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 //
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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 #include <cstddef>
00047 
00048 namespace ost {
00049 
00056 template <class T>
00057 class Pointer
00058 {
00059 protected:
00060         unsigned *ptrCount;
00061         T *ptrObject;
00062 
00063         void ptrDetach(void)
00064         {
00065                 if(ptrCount && --(*ptrCount)==0) {
00066                         delete ptrObject;
00067                         delete ptrCount;
00068                 }
00069                 ptrObject = NULL;
00070                 ptrCount = NULL;
00071         }
00072 
00073 public:
00074         explicit Pointer(T* ptr = NULL) : ptrObject(ptr)
00075         {
00076                 ptrCount = new unsigned;
00077                 *ptrCount = 1;
00078         }
00079 
00080         Pointer(const Pointer<T> &ref)
00081         {
00082                 ptrObject = ref.ptrObject;
00083                 ptrCount = ref.ptrCount;
00084                 ++(*ptrCount);
00085         }
00086 
00087         inline virtual ~Pointer()
00088                 {ptrDetach();}
00089 
00090 
00091         Pointer& operator=(const Pointer<T> &ref)
00092         {
00093                 if(this != &ref) {
00094                         ptrDetach();
00095                         ptrObject = ref.ptrObject;
00096                         ptrCount = ref.ptrCount;
00097                         ++(*ptrCount);
00098                 }
00099                 return *this;
00100         }
00101 
00102         inline T& operator*() const
00103                 {return *ptrObject;};
00104 
00105         inline T* getObject() const
00106                 {return ptrObject;};
00107 
00108         inline T* operator->() const
00109                 {return ptrObject;};
00110 
00111         inline bool operator!() const
00112                 {return (*ptrCount == 1);};
00113 
00114         inline int operator++() const
00115                 {return ++(*ptrCount);};
00116 
00117         int operator--() const
00118         {
00119                 if(*ptrCount == 1) {
00120                         delete this;
00121                         return 0;
00122                 }
00123                 return --(*ptrCount);
00124         }
00125 };
00126 
00127 }

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