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
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
|
/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** 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 The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
****************************************************************************/
#ifndef QFLAGPOINTER_P_H
#define QFLAGPOINTER_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>
QT_BEGIN_NAMESPACE
namespace QtPrivate {
template <typename T> struct QFlagPointerAlignment
{
enum : size_t { Value = Q_ALIGNOF(T) };
};
template <> struct QFlagPointerAlignment<void>
{
enum : size_t { Value = ~size_t(0) };
};
}
template<typename T>
class QFlagPointer {
public:
inline QFlagPointer();
inline QFlagPointer(T *);
inline QFlagPointer(const QFlagPointer<T> &o);
inline bool isNull() const;
inline bool flag() const;
inline void setFlag();
inline void clearFlag();
inline void setFlagValue(bool);
inline bool flag2() const;
inline void setFlag2();
inline void clearFlag2();
inline void setFlag2Value(bool);
inline QFlagPointer<T> &operator=(const QFlagPointer &o);
inline QFlagPointer<T> &operator=(T *);
inline T *operator->() const;
inline T *operator*() const;
inline T *data() const;
inline explicit operator bool() const;
private:
quintptr ptr_value = 0;
static const quintptr FlagBit = 0x1;
static const quintptr Flag2Bit = 0x2;
static const quintptr FlagsMask = FlagBit | Flag2Bit;
};
template<typename T, typename T2>
class QBiPointer {
public:
inline QBiPointer();
inline QBiPointer(T *);
inline QBiPointer(T2 *);
inline QBiPointer(const QBiPointer<T, T2> &o);
inline bool isNull() const;
inline bool isT1() const;
inline bool isT2() const;
inline bool flag() const;
inline void setFlag();
inline void clearFlag();
inline void setFlagValue(bool);
inline QBiPointer<T, T2> &operator=(const QBiPointer<T, T2> &o);
inline QBiPointer<T, T2> &operator=(T *);
inline QBiPointer<T, T2> &operator=(T2 *);
inline T *asT1() const;
inline T2 *asT2() const;
private:
quintptr ptr_value = 0;
static const quintptr FlagBit = 0x1;
static const quintptr Flag2Bit = 0x2;
static const quintptr FlagsMask = FlagBit | Flag2Bit;
};
template<typename T>
QFlagPointer<T>::QFlagPointer()
{
}
template<typename T>
QFlagPointer<T>::QFlagPointer(T *v)
: ptr_value(quintptr(v))
{
Q_STATIC_ASSERT_X(Q_ALIGNOF(T) >= 4, "Type T does not have sufficient alignment");
Q_ASSERT((ptr_value & FlagsMask) == 0);
}
template<typename T>
QFlagPointer<T>::QFlagPointer(const QFlagPointer<T> &o)
: ptr_value(o.ptr_value)
{
}
template<typename T>
bool QFlagPointer<T>::isNull() const
{
return 0 == (ptr_value & (~FlagsMask));
}
template<typename T>
bool QFlagPointer<T>::flag() const
{
return ptr_value & FlagBit;
}
template<typename T>
void QFlagPointer<T>::setFlag()
{
ptr_value |= FlagBit;
}
template<typename T>
void QFlagPointer<T>::clearFlag()
{
ptr_value &= ~FlagBit;
}
template<typename T>
void QFlagPointer<T>::setFlagValue(bool v)
{
if (v) setFlag();
else clearFlag();
}
template<typename T>
bool QFlagPointer<T>::flag2() const
{
return ptr_value & Flag2Bit;
}
template<typename T>
void QFlagPointer<T>::setFlag2()
{
ptr_value|= Flag2Bit;
}
template<typename T>
void QFlagPointer<T>::clearFlag2()
{
ptr_value &= ~Flag2Bit;
}
template<typename T>
void QFlagPointer<T>::setFlag2Value(bool v)
{
if (v) setFlag2();
else clearFlag2();
}
template<typename T>
QFlagPointer<T> &QFlagPointer<T>::operator=(const QFlagPointer &o)
{
ptr_value = o.ptr_value;
return *this;
}
template<typename T>
QFlagPointer<T> &QFlagPointer<T>::operator=(T *o)
{
Q_ASSERT((quintptr(o) & FlagsMask) == 0);
ptr_value = quintptr(o) | (ptr_value & FlagsMask);
return *this;
}
template<typename T>
T *QFlagPointer<T>::operator->() const
{
return (T *)(ptr_value & ~FlagsMask);
}
template<typename T>
T *QFlagPointer<T>::operator*() const
{
return (T *)(ptr_value & ~FlagsMask);
}
template<typename T>
T *QFlagPointer<T>::data() const
{
return (T *)(ptr_value & ~FlagsMask);
}
template<typename T>
QFlagPointer<T>::operator bool() const
{
return data() != nullptr;
}
template<typename T, typename T2>
QBiPointer<T, T2>::QBiPointer()
{
}
template<typename T, typename T2>
QBiPointer<T, T2>::QBiPointer(T *v)
: ptr_value(quintptr(v))
{
Q_STATIC_ASSERT_X(QtPrivate::QFlagPointerAlignment<T>::Value >= 4,
"Type T does not have sufficient alignment");
Q_ASSERT((quintptr(v) & FlagsMask) == 0);
}
template<typename T, typename T2>
QBiPointer<T, T2>::QBiPointer(T2 *v)
: ptr_value(quintptr(v) | Flag2Bit)
{
Q_STATIC_ASSERT_X(QtPrivate::QFlagPointerAlignment<T2>::Value >= 4,
"Type T2 does not have sufficient alignment");
Q_ASSERT((quintptr(v) & FlagsMask) == 0);
}
template<typename T, typename T2>
QBiPointer<T, T2>::QBiPointer(const QBiPointer<T, T2> &o)
: ptr_value(o.ptr_value)
{
}
template<typename T, typename T2>
bool QBiPointer<T, T2>::isNull() const
{
return 0 == (ptr_value & (~FlagsMask));
}
template<typename T, typename T2>
bool QBiPointer<T, T2>::isT1() const
{
return !(ptr_value & Flag2Bit);
}
template<typename T, typename T2>
bool QBiPointer<T, T2>::isT2() const
{
return ptr_value & Flag2Bit;
}
template<typename T, typename T2>
bool QBiPointer<T, T2>::flag() const
{
return ptr_value & FlagBit;
}
template<typename T, typename T2>
void QBiPointer<T, T2>::setFlag()
{
ptr_value |= FlagBit;
}
template<typename T, typename T2>
void QBiPointer<T, T2>::clearFlag()
{
ptr_value &= ~FlagBit;
}
template<typename T, typename T2>
void QBiPointer<T, T2>::setFlagValue(bool v)
{
if (v) setFlag();
else clearFlag();
}
template<typename T, typename T2>
QBiPointer<T, T2> &QBiPointer<T, T2>::operator=(const QBiPointer<T, T2> &o)
{
ptr_value = o.ptr_value;
return *this;
}
template<typename T, typename T2>
QBiPointer<T, T2> &QBiPointer<T, T2>::operator=(T *o)
{
Q_ASSERT((quintptr(o) & FlagsMask) == 0);
ptr_value = quintptr(o) | (ptr_value & FlagBit);
return *this;
}
template<typename T, typename T2>
QBiPointer<T, T2> &QBiPointer<T, T2>::operator=(T2 *o)
{
Q_ASSERT((quintptr(o) & FlagsMask) == 0);
ptr_value = quintptr(o) | (ptr_value & FlagBit) | Flag2Bit;
return *this;
}
template<typename T, typename T2>
T *QBiPointer<T, T2>::asT1() const
{
Q_ASSERT(isT1());
return (T *)(ptr_value & ~FlagsMask);
}
template<typename T, typename T2>
T2 *QBiPointer<T, T2>::asT2() const
{
Q_ASSERT(isT2());
return (T2 *)(ptr_value & ~FlagsMask);
}
QT_END_NAMESPACE
#endif // QFLAGPOINTER_P_H
|
