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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 #ifndef CCXX_POINTER_H_
00047 #define CCXX_POINTER_H_
00048 
00049 #ifndef CCXX_MISSING_H_
00050 #include <cc++/missing.h>
00051 #endif
00052 
00053 namespace ost {
00054 
00061 template <class T>
00062 class Pointer
00063 {
00064 protected:
00065         unsigned *ptrCount;
00066         T *ptrObject;
00067 
00068         void ptrDetach(void)
00069         {
00070                 if(ptrCount && --(*ptrCount)==0) {
00071                         delete ptrObject;
00072                         delete ptrCount;
00073                 }
00074                 ptrObject = NULL;
00075                 ptrCount = NULL;
00076         }
00077 
00078 public:
00079         explicit Pointer(T* ptr = NULL) : ptrObject(ptr)
00080         {
00081                 ptrCount = new unsigned;
00082                 *ptrCount = 1;
00083         }
00084 
00085         Pointer(const Pointer<T> &ref)
00086         {
00087                 ptrObject = ref.ptrObject;
00088                 ptrCount = ref.ptrCount;
00089                 ++(*ptrCount);
00090         }
00091 
00092         inline virtual ~Pointer()
00093                 {ptrDetach();}
00094 
00095 
00096         Pointer& operator=(const Pointer<T> &ref)
00097         {
00098                 if(this != &ref) {
00099                         ptrDetach();
00100                         ptrObject = ref.ptrObject;
00101                         ptrCount = ref.ptrCount;
00102                         ++(*ptrCount);
00103                 }
00104                 return *this;
00105         }
00106 
00107         inline T& operator*() const
00108                 {return *ptrObject;};
00109 
00110         inline T* getObject() const
00111                 {return ptrObject;};
00112 
00113         inline T* operator->() const
00114                 {return ptrObject;};
00115 
00116         inline bool operator!() const
00117                 {return (*ptrCount == 1);};
00118 
00119         inline int operator++() const
00120                 {return ++(*ptrCount);};
00121 
00122         int operator--() const
00123         {
00124                 if(*ptrCount == 1) {
00125                         delete this;
00126                         return 0;
00127                 }
00128                 return --(*ptrCount);
00129         }
00130 };
00131 
00132 }
00133 
00134 #endif

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