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
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QPOINTERVALUEPAIR_P_H
#define QPOINTERVALUEPAIR_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtCore/qglobal.h>
#include <private/qflagpointer_p.h>
QT_BEGIN_NAMESPACE
// QPointerValuePair is intended to help reduce the memory consumption of a class.
// In the common case, QPointerValuePair behaves like a pointer. In this mode, it
// consumes the same memory as a regular pointer.
// Additionally, QPointerValuePair can store an arbitrary value type in *addition*
// to the pointer. In this case, it uses slightly more memory than the pointer and
// value type combined.
// Consequently, this class is most useful in cases where a pointer is always stored
// and a value type is rarely stored.
template<typename P, typename V>
class QPointerValuePair {
public:
inline QPointerValuePair();
inline QPointerValuePair(P *);
inline ~QPointerValuePair();
inline bool isNull() const;
inline bool flag() const;
inline void setFlag();
inline void clearFlag();
inline void setFlagValue(bool);
inline QPointerValuePair<P, V> &operator=(P *);
inline P *operator->() const;
inline P *operator*() const;
inline bool hasValue() const;
inline V &value();
inline const V *constValue() const;
private:
struct Value { P *pointer; V value; };
QBiPointer<P, Value> d;
};
template<typename P, typename V>
QPointerValuePair<P, V>::QPointerValuePair()
{
}
template<typename P, typename V>
QPointerValuePair<P, V>::QPointerValuePair(P *p)
: d(p)
{
}
template<typename P, typename V>
QPointerValuePair<P, V>::~QPointerValuePair()
{
if (d.isT2()) delete d.asT2();
}
template<typename P, typename V>
bool QPointerValuePair<P, V>::isNull() const
{
if (d.isT1()) return 0 == d.asT1();
else return d.asT2()->pointer == 0;
}
template<typename P, typename V>
bool QPointerValuePair<P, V>::flag() const
{
return d.flag();
}
template<typename P, typename V>
void QPointerValuePair<P, V>::setFlag()
{
d.setFlag();
}
template<typename P, typename V>
void QPointerValuePair<P, V>::clearFlag()
{
d.clearFlag();
}
template<typename P, typename V>
void QPointerValuePair<P, V>::setFlagValue(bool v)
{
d.setFlagValue(v);
}
template<typename P, typename V>
QPointerValuePair<P, V> &QPointerValuePair<P, V>::operator=(P *o)
{
if (d.isT1()) d = o;
else d.asT2()->pointer = o;
return *this;
}
template<typename P, typename V>
P *QPointerValuePair<P, V>::operator->() const
{
if (d.isT1()) return d.asT1();
else return d.asT2()->pointer;
}
template<typename P, typename V>
P *QPointerValuePair<P, V>::operator*() const
{
if (d.isT1()) return d.asT1();
else return d.asT2()->pointer;
}
template<typename P, typename V>
bool QPointerValuePair<P, V>::hasValue() const
{
return d.isT2();
}
template<typename P, typename V>
V &QPointerValuePair<P, V>::value()
{
if (d.isT1()) {
P *p = d.asT1();
Value *value = new Value;
value->pointer = p;
d = value;
}
return d.asT2()->value;
}
// Will return null if hasValue() == false
template<typename P, typename V>
const V *QPointerValuePair<P, V>::constValue() const
{
if (d.isT2()) return &d.asT2()->value;
else return 0;
}
QT_END_NAMESPACE
#endif // QPOINTERVALUEPAIR_P_H
|
