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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 // 
00008 // This program is distributed in the hope that it will be useful,
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 namespace ost {
00047 
00054 template <class T>
00055 class Pointer
00056 {
00057 protected:
00058         unsigned *ptrCount;
00059         T *ptrObject;
00060 
00061         void ptrDetach(void)
00062         {
00063                 if(ptrCount && --(*ptrCount)==0)
00064                 {
00065                         delete ptrObject;
00066                         delete ptrCount;
00067                 }
00068                 ptrObject = NULL;
00069                 ptrCount = NULL;                
00070         }
00071 
00072 public:
00073         explicit Pointer(T* ptr = NULL) : ptrObject(ptr)
00074         {
00075                 ptrCount = new unsigned;
00076                 *ptrCount = 1;
00077         }
00078         
00079         Pointer(const Pointer<T> &ref)
00080         {
00081                 ptrObject = ref.ptrObject;
00082                 ptrCount = ref.ptrCount;
00083                 ++(*ptrCount);  
00084         }
00085 
00086         inline virtual ~Pointer()
00087         {
00088                 ptrDetach();
00089         }
00090 
00091 
00092         Pointer& operator=(const Pointer<T> &ref)
00093         {
00094                 if(this != &ref)
00095                 {
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                 {
00123                         delete this;
00124                         return 0;
00125                 }
00126                 return --(*ptrCount);
00127         }
00128 };      
00129 
00130 }

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