Alexandre Lision | ddd731e | 2014-01-31 11:50:08 -0500 | [diff] [blame] | 1 | // Copyright (C) 2001-2005 Open Source Telecom Corporation. |
| 2 | // Copyright (C) 2006-2010 David Sugar, Tycho Softworks. |
| 3 | // |
| 4 | // This program is free software; you can redistribute it and/or modify |
| 5 | // it under the terms of the GNU General Public License as published by |
| 6 | // the Free Software Foundation; either version 2 of the License, or |
| 7 | // (at your option) any later version. |
| 8 | // |
| 9 | // This program is distributed in the hope that it will be useful, |
| 10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | // GNU General Public License for more details. |
| 13 | // |
| 14 | // You should have received a copy of the GNU General Public License |
| 15 | // along with this program; if not, write to the Free Software |
| 16 | // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 17 | // |
| 18 | // As a special exception to the GNU General Public License, permission is |
| 19 | // granted for additional uses of the text contained in its release |
| 20 | // of Common C++. |
| 21 | // |
| 22 | // The exception is that, if you link the Common C++ library with other |
| 23 | // files to produce an executable, this does not by itself cause the |
| 24 | // resulting executable to be covered by the GNU General Public License. |
| 25 | // Your use of that executable is in no way restricted on account of |
| 26 | // linking the Common C++ library code into it. |
| 27 | // |
| 28 | // This exception does not however invalidate any other reasons why |
| 29 | // the executable file might be covered by the GNU General Public License. |
| 30 | // |
| 31 | // This exception applies only to the code released under the |
| 32 | // name Common C++. If you copy code from other releases into a copy of |
| 33 | // Common C++, as the General Public License permits, the exception does |
| 34 | // not apply to the code that you add in this way. To avoid misleading |
| 35 | // anyone as to the status of such modified files, you must delete |
| 36 | // this exception notice from them. |
| 37 | // |
| 38 | // If you write modifications of your own for Common C++, it is your choice |
| 39 | // whether to permit this exception to apply to your modifications. |
| 40 | // If you do not wish that, delete this exception notice. |
| 41 | |
| 42 | /** |
| 43 | * @file commoncpp/pointer.h |
| 44 | * @short Template for creating reference count managed smart pointers. |
| 45 | **/ |
| 46 | |
| 47 | #ifndef COMMONCPP_POINTER_H_ |
| 48 | #define COMMONCPP_POINTER_H_ |
| 49 | |
| 50 | #ifndef COMMONCPP_CONFIG_H_ |
| 51 | #include <commoncpp/config.h> |
| 52 | #endif |
| 53 | |
| 54 | NAMESPACE_COMMONCPP |
| 55 | |
| 56 | /** |
| 57 | * Used to create and manage referece counted pointers. |
| 58 | * |
| 59 | * @author David Sugar <dyfet@gnutelephony.org> |
| 60 | * @short reference counted pointer template. |
| 61 | */ |
| 62 | template <class T> |
| 63 | class Pointer |
| 64 | { |
| 65 | protected: |
| 66 | unsigned *ptrCount; |
| 67 | T *ptrObject; |
| 68 | |
| 69 | void ptrDetach(void) |
| 70 | { |
| 71 | if(ptrCount && --(*ptrCount)==0) { |
| 72 | delete ptrObject; |
| 73 | delete ptrCount; |
| 74 | } |
| 75 | ptrObject = NULL; |
| 76 | ptrCount = NULL; |
| 77 | } |
| 78 | |
| 79 | public: |
| 80 | explicit Pointer(T* ptr = NULL) : ptrObject(ptr) |
| 81 | { |
| 82 | ptrCount = new unsigned; |
| 83 | *ptrCount = 1; |
| 84 | } |
| 85 | |
| 86 | Pointer(const Pointer<T> &ref) |
| 87 | { |
| 88 | ptrObject = ref.ptrObject; |
| 89 | ptrCount = ref.ptrCount; |
| 90 | ++(*ptrCount); |
| 91 | } |
| 92 | |
| 93 | inline virtual ~Pointer() |
| 94 | {ptrDetach();} |
| 95 | |
| 96 | |
| 97 | Pointer& operator=(const Pointer<T> &ref) |
| 98 | { |
| 99 | if(this != &ref) { |
| 100 | ptrDetach(); |
| 101 | ptrObject = ref.ptrObject; |
| 102 | ptrCount = ref.ptrCount; |
| 103 | ++(*ptrCount); |
| 104 | } |
| 105 | return *this; |
| 106 | } |
| 107 | |
| 108 | inline T& operator*() const |
| 109 | {return *ptrObject;}; |
| 110 | |
| 111 | inline T* getObject() const |
| 112 | {return ptrObject;}; |
| 113 | |
| 114 | inline T* operator->() const |
| 115 | {return ptrObject;}; |
| 116 | |
| 117 | inline bool operator!() const |
| 118 | {return (*ptrCount == 1);}; |
| 119 | |
| 120 | inline int operator++() const |
| 121 | {return ++(*ptrCount);}; |
| 122 | |
| 123 | int operator--() const |
| 124 | { |
| 125 | if(*ptrCount == 1) { |
| 126 | delete this; |
| 127 | return 0; |
| 128 | } |
| 129 | return --(*ptrCount); |
| 130 | } |
| 131 | }; |
| 132 | |
| 133 | END_NAMESPACE |
| 134 | |
| 135 | #endif |