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 //
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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
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00039 // If you do not wish that, delete this exception notice.
00040 
00046 #ifndef CCXX_MISSING_H_
00047 #include <cc++/missing.h>
00048 #endif
00049 
00050 namespace ost {
00051 
00058 template <class T>
00059 class Pointer
00060 {
00061 protected:
00062         unsigned *ptrCount;
00063         T *ptrObject;
00064 
00065         void ptrDetach(void)
00066         {
00067                 if(ptrCount && --(*ptrCount)==0) {
00068                         delete ptrObject;
00069                         delete ptrCount;
00070                 }
00071                 ptrObject = NULL;
00072                 ptrCount = NULL;
00073         }
00074 
00075 public:
00076         explicit Pointer(T* ptr = NULL) : ptrObject(ptr)
00077         {
00078                 ptrCount = new unsigned;
00079                 *ptrCount = 1;
00080         }
00081 
00082         Pointer(const Pointer<T> &ref)
00083         {
00084                 ptrObject = ref.ptrObject;
00085                 ptrCount = ref.ptrCount;
00086                 ++(*ptrCount);
00087         }
00088 
00089         inline virtual ~Pointer()
00090                 {ptrDetach();}
00091 
00092 
00093         Pointer& operator=(const Pointer<T> &ref)
00094         {
00095                 if(this != &ref) {
00096                         ptrDetach();
00097                         ptrObject = ref.ptrObject;
00098                         ptrCount = ref.ptrCount;
00099                         ++(*ptrCount);
00100                 }
00101                 return *this;
00102         }
00103 
00104         inline T& operator*() const
00105                 {return *ptrObject;};
00106 
00107         inline T* getObject() const
00108                 {return ptrObject;};
00109 
00110         inline T* operator->() const
00111                 {return ptrObject;};
00112 
00113         inline bool operator!() const
00114                 {return (*ptrCount == 1);};
00115 
00116         inline int operator++() const
00117                 {return ++(*ptrCount);};
00118 
00119         int operator--() const
00120         {
00121                 if(*ptrCount == 1) {
00122                         delete this;
00123                         return 0;
00124                 }
00125                 return --(*ptrCount);
00126         }
00127 };
00128 
00129 }

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