1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt Solutions component.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QGUARD_P_H
#define QGUARD_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of qapplication_*.cpp, qwidget*.cpp and qfiledialog.cpp. This header
// file may change from version to version without notice, or even be removed.
//
// We mean it.
//
#include "QtCore/qglobal.h"
QT_BEGIN_NAMESPACE
class QObject;
template<class T>
class QGuard
{
QObject *o;
QGuard<QObject> *next;
QGuard<QObject> **prev;
friend void q_guard_addGuard(QGuard<QObject> *);
friend void q_guard_removeGuard(QGuard<QObject> *);
friend class QObjectPrivate;
public:
inline QGuard();
inline QGuard(T *);
inline QGuard(const QGuard<T> &);
inline virtual ~QGuard();
inline QGuard<T> &operator=(const QGuard<T> &o);
inline QGuard<T> &operator=(T *);
inline bool isNull() const
{ return !o; }
inline T* operator->() const
{ return static_cast<T*>(const_cast<QObject*>(o)); }
inline T& operator*() const
{ return *static_cast<T*>(const_cast<QObject*>(o)); }
inline operator T*() const
{ return static_cast<T*>(const_cast<QObject*>(o)); }
inline T* data() const
{ return static_cast<T*>(const_cast<QObject*>(o)); }
protected:
virtual void objectDestroyed(T *) {}
};
QT_END_NAMESPACE
#include "private/qobject_p.h"
QT_BEGIN_NAMESPACE
inline void q_guard_addGuard(QGuard<QObject> *);
inline void q_guard_removeGuard(QGuard<QObject> *);
template<class T>
QGuard<T>::QGuard()
: o(0), next(0), prev(0)
{
}
template<class T>
QGuard<T>::QGuard(T *g)
: o(g), next(0), prev(0)
{
if (o) q_guard_addGuard(reinterpret_cast<QGuard<QObject> *>(this));
}
template<class T>
QGuard<T>::QGuard(const QGuard<T> &g)
: o(g.o), next(0), prev(0)
{
if (o) q_guard_addGuard(reinterpret_cast<QGuard<QObject> *>(this));
}
template<class T>
QGuard<T>::~QGuard()
{
if (prev) q_guard_removeGuard(reinterpret_cast<QGuard<QObject> *>(this));
o = 0;
}
template<class T>
QGuard<T> &QGuard<T>::operator=(const QGuard<T> &g)
{
if (g.o != o) {
if (prev)
q_guard_removeGuard(reinterpret_cast<QGuard<QObject> *>(this));
o = g.o;
if (o) q_guard_addGuard(reinterpret_cast<QGuard<QObject> *>(this));
}
return *this;
}
template<class T>
inline QGuard<T> &QGuard<T>::operator=(T *g)
{
if (g != o) {
if (prev)
q_guard_removeGuard(reinterpret_cast<QGuard<QObject> *>(this));
o = g;
if (o) q_guard_addGuard(reinterpret_cast<QGuard<QObject> *>(this));
}
return *this;
}
QT_END_NAMESPACE
#endif // QGUARD_P_H
|
