pointer.h

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00001 // Copyright (C) 2001-2005 Open Source Telecom Corporation.
00002 // Copyright (C) 2006-2008 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
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00011 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012 // GNU General Public License for more details.
00013 //
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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
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00029 // the executable file might be covered by the GNU General Public License.
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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 namespace ost {
00055 
00062 template <class T>
00063 class Pointer
00064 {
00065 protected:
00066         unsigned *ptrCount;
00067         T *ptrObject;
00068 
00069         void ptrDetach(void)
00070         {
00071                 if(ptrCount && --(*ptrCount)==0) {
00072                         delete ptrObject;
00073                         delete ptrCount;
00074                 }
00075                 ptrObject = NULL;
00076                 ptrCount = NULL;
00077         }
00078 
00079 public:
00080         explicit Pointer(T* ptr = NULL) : ptrObject(ptr)
00081         {
00082                 ptrCount = new unsigned;
00083                 *ptrCount = 1;
00084         }
00085 
00086         Pointer(const Pointer<T> &ref)
00087         {
00088                 ptrObject = ref.ptrObject;
00089                 ptrCount = ref.ptrCount;
00090                 ++(*ptrCount);
00091         }
00092 
00093         inline virtual ~Pointer()
00094                 {ptrDetach();}
00095 
00096 
00097         Pointer& operator=(const Pointer<T> &ref)
00098         {
00099                 if(this != &ref) {
00100                         ptrDetach();
00101                         ptrObject = ref.ptrObject;
00102                         ptrCount = ref.ptrCount;
00103                         ++(*ptrCount);
00104                 }
00105                 return *this;
00106         }
00107 
00108         inline T& operator*() const
00109                 {return *ptrObject;};
00110 
00111         inline T* getObject() const
00112                 {return ptrObject;};
00113 
00114         inline T* operator->() const
00115                 {return ptrObject;};
00116 
00117         inline bool operator!() const
00118                 {return (*ptrCount == 1);};
00119 
00120         inline int operator++() const
00121                 {return ++(*ptrCount);};
00122 
00123         int operator--() const
00124         {
00125                 if(*ptrCount == 1) {
00126                         delete this;
00127                         return 0;
00128                 }
00129                 return --(*ptrCount);
00130         }
00131 };
00132 
00133 }
00134 
00135 #endif

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