ucommon
commoncpp/pointer.h
Go to the documentation of this file.
00001 // Copyright (C) 2001-2005 Open Source Telecom Corporation.
00002 // Copyright (C) 2006-2014 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
00006 // the Free Software Foundation; either version 2 of the License, or
00007 // (at your option) any later version.
00008 //
00009 // This program is distributed in the hope that it will be useful,
00010 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00011 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012 // GNU General Public License for more details.
00013 //
00014 // You should have received a copy of the GNU Lesser General Public License
00015 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 COMMONCPP_POINTER_H_
00047 #define COMMONCPP_POINTER_H_
00048 
00049 #ifndef COMMONCPP_CONFIG_H_
00050 #include <commoncpp/config.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     inline void ptrDetach(void) {
00069         if(ptrCount && --(*ptrCount)==0) {
00070             delete ptrObject;
00071             delete ptrCount;
00072         }
00073         ptrObject = NULL;
00074         ptrCount = NULL;
00075     }
00076 
00077 public:
00078     inline explicit Pointer(T* ptr = NULL) : ptrObject(ptr) {
00079         ptrCount = new unsigned;
00080         *ptrCount = 1;
00081     }
00082 
00083     inline Pointer(const Pointer<T> &ref) {
00084         ptrObject = ref.ptrObject;
00085         ptrCount = ref.ptrCount;
00086         ++(*ptrCount);
00087     }
00088 
00089     inline virtual ~Pointer()
00090         {ptrDetach();}
00091 
00092 
00093     inline Pointer& operator=(const Pointer<T> &ref) {
00094         if(this != &ref) {
00095             ptrDetach();
00096             ptrObject = ref.ptrObject;
00097             ptrCount = ref.ptrCount;
00098             ++(*ptrCount);
00099         }
00100         return *this;
00101     }
00102 
00103     inline T& operator*() const
00104         {return *ptrObject;}
00105 
00106     inline T* getObject() const
00107         {return ptrObject;}
00108 
00109     inline T* operator->() const
00110         {return ptrObject;}
00111 
00112     inline bool operator!() const
00113         {return (*ptrCount == 1);}
00114 
00115     inline int operator++() const
00116         {return ++(*ptrCount);}
00117 
00118     inline int operator--() const {
00119         if(*ptrCount == 1) {
00120             delete this;
00121             return 0;
00122         }
00123         return --(*ptrCount);
00124     }
00125 };
00126 
00127 } // namespace ost
00128 
00129 #endif