UCommon
pointer.h
Go to the documentation of this file.
1// Copyright (C) 2001-2005 Open Source Telecom Corporation.
2// Copyright (C) 2006-2014 David Sugar, Tycho Softworks.
3// Copyright (C) 2015 Cherokees of Idaho.
4//
5// This program is free software; you can redistribute it and/or modify
6// it under the terms of the GNU General Public License as published by
7// the Free Software Foundation; either version 2 of the License, or
8// (at your option) any later version.
9//
10// This program is distributed in the hope that it will be useful,
11// but WITHOUT ANY WARRANTY; without even the implied warranty of
12// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13// GNU General Public License for more details.
14//
15// You should have received a copy of the GNU Lesser General Public License
16// along with this program. If not, see <http://www.gnu.org/licenses/>.
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
47#ifndef COMMONCPP_POINTER_H_
48#define COMMONCPP_POINTER_H_
49
50#ifndef COMMONCPP_CONFIG_H_
51#include <commoncpp/config.h>
52#endif
53
54namespace ost {
55
62template <class T>
64{
65protected:
66 unsigned *ptrCount;
67 T *ptrObject;
68
69 inline void ptrDetach(void) {
70 if(ptrCount && --(*ptrCount)==0) {
71 delete ptrObject;
72 delete ptrCount;
73 }
74 ptrObject = NULL;
75 ptrCount = NULL;
76 }
77
78public:
79 inline explicit Pointer(T* ptr = NULL) : ptrObject(ptr) {
80 ptrCount = new unsigned;
81 *ptrCount = 1;
82 }
83
84 inline Pointer(const Pointer<T> &ref) {
85 ptrObject = ref.ptrObject;
86 ptrCount = ref.ptrCount;
87 ++(*ptrCount);
88 }
89
90 inline virtual ~Pointer() {
91 ptrDetach();
92 }
93
94 inline Pointer& operator=(const Pointer<T> &ref) {
95 if(this != &ref) {
96 ptrDetach();
97 ptrObject = ref.ptrObject;
98 ptrCount = ref.ptrCount;
99 ++(*ptrCount);
100 }
101 return *this;
102 }
103
104 inline T& operator*() const {
105 return *ptrObject;
106 }
107
108 inline T* getObject() const {
109 return ptrObject;
110 }
111
112 inline T* operator->() const {
113 return ptrObject;
114 }
115
116 inline operator bool() const {
117 return (*ptrCount != 1);
118 }
119
120 inline bool operator!() const {
121 return (*ptrCount == 1);
122 }
123
124 inline int operator++() const {
125 return ++(*ptrCount);
126 }
127
128 inline int operator--() const {
129 if(*ptrCount == 1) {
130 delete this;
131 return 0;
132 }
133 return --(*ptrCount);
134 }
135};
136
137} // namespace ost
138
139#endif
Used to create and manage referece counted pointers.
Definition pointer.h:64