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
|
/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtCore/qtypetraits.h>
#ifndef QTYPEINFO_H
#define QTYPEINFO_H
QT_BEGIN_NAMESPACE
/*
QTypeInfo - type trait functionality
*/
/*
The catch-all template.
*/
template <typename T>
class QTypeInfo
{
public:
enum {
isPointer = false,
isIntegral = QtPrivate::is_integral<T>::value,
isComplex = true,
isStatic = true,
isLarge = (sizeof(T)>sizeof(void*)),
isDummy = false, //### Qt6: remove
sizeOf = sizeof(T)
};
};
template<>
class QTypeInfo<void>
{
public:
enum {
isPointer = false,
isIntegral = false,
isComplex = false,
isStatic = false,
isLarge = false,
isDummy = false,
sizeOf = 0
};
};
template <typename T>
class QTypeInfo<T*>
{
public:
enum {
isPointer = true,
isIntegral = false,
isComplex = false,
isStatic = false,
isLarge = false,
isDummy = false,
sizeOf = sizeof(T*)
};
};
/*!
\class QTypeInfoMerger
\inmodule QtCore
\internal
\brief QTypeInfoMerger merges the QTypeInfo flags of T1, T2... and presents them
as a QTypeInfo<T> would do.
Let's assume that we have a simple set of structs:
\snippet code/src_corelib_global_qglobal.cpp 50
To create a proper QTypeInfo specialization for A struct, we have to check
all sub-components; B, C and D, then take the lowest common denominator and call
Q_DECLARE_TYPEINFO with the resulting flags. An easier and less fragile approach is to
use QTypeInfoMerger, which does that automatically. So struct A would have
the following QTypeInfo definition:
\snippet code/src_corelib_global_qglobal.cpp 51
*/
template <class T, class T1, class T2 = T1, class T3 = T1, class T4 = T1>
class QTypeInfoMerger
{
public:
enum {
isComplex = QTypeInfo<T1>::isComplex || QTypeInfo<T2>::isComplex || QTypeInfo<T3>::isComplex || QTypeInfo<T4>::isComplex,
isStatic = QTypeInfo<T1>::isStatic || QTypeInfo<T2>::isStatic || QTypeInfo<T3>::isStatic || QTypeInfo<T4>::isStatic,
isLarge = sizeof(T) > sizeof(void*),
isPointer = false,
isIntegral = false,
isDummy = false,
sizeOf = sizeof(T)
};
};
#define Q_DECLARE_MOVABLE_CONTAINER(CONTAINER) \
template <typename T> class CONTAINER; \
template <typename T> \
class QTypeInfo< CONTAINER<T> > \
{ \
public: \
enum { \
isPointer = false, \
isIntegral = false, \
isComplex = true, \
isStatic = false, \
isLarge = (sizeof(CONTAINER<T>) > sizeof(void*)), \
isDummy = false, \
sizeOf = sizeof(CONTAINER<T>) \
}; \
};
Q_DECLARE_MOVABLE_CONTAINER(QList)
Q_DECLARE_MOVABLE_CONTAINER(QVector)
Q_DECLARE_MOVABLE_CONTAINER(QQueue)
Q_DECLARE_MOVABLE_CONTAINER(QStack)
Q_DECLARE_MOVABLE_CONTAINER(QLinkedList)
Q_DECLARE_MOVABLE_CONTAINER(QSet)
#undef Q_DECLARE_MOVABLE_CONTAINER
/*
Specialize a specific type with:
Q_DECLARE_TYPEINFO(type, flags);
where 'type' is the name of the type to specialize and 'flags' is
logically-OR'ed combination of the flags below.
*/
enum { /* TYPEINFO flags */
Q_COMPLEX_TYPE = 0,
Q_PRIMITIVE_TYPE = 0x1,
Q_STATIC_TYPE = 0,
Q_MOVABLE_TYPE = 0x2,
Q_DUMMY_TYPE = 0x4
};
#define Q_DECLARE_TYPEINFO_BODY(TYPE, FLAGS) \
class QTypeInfo<TYPE > \
{ \
public: \
enum { \
isComplex = (((FLAGS) & Q_PRIMITIVE_TYPE) == 0), \
isStatic = (((FLAGS) & (Q_MOVABLE_TYPE | Q_PRIMITIVE_TYPE)) == 0), \
isLarge = (sizeof(TYPE)>sizeof(void*)), \
isPointer = false, \
isIntegral = QtPrivate::is_integral< TYPE >::value, \
isDummy = (((FLAGS) & Q_DUMMY_TYPE) != 0), \
sizeOf = sizeof(TYPE) \
}; \
static inline const char *name() { return #TYPE; } \
}
#define Q_DECLARE_TYPEINFO(TYPE, FLAGS) \
template<> \
Q_DECLARE_TYPEINFO_BODY(TYPE, FLAGS)
/* Specialize QTypeInfo for QFlags<T> */
template<typename T> class QFlags;
template<typename T>
Q_DECLARE_TYPEINFO_BODY(QFlags<T>, Q_PRIMITIVE_TYPE);
/*
Specialize a shared type with:
Q_DECLARE_SHARED(type)
where 'type' is the name of the type to specialize. NOTE: shared
types must define a member-swap, and be defined in the same
namespace as Qt for this to work.
*/
#define Q_DECLARE_SHARED_STL(TYPE) \
QT_END_NAMESPACE \
namespace std { \
template<> inline void swap< QT_PREPEND_NAMESPACE(TYPE) >(QT_PREPEND_NAMESPACE(TYPE) &value1, QT_PREPEND_NAMESPACE(TYPE) &value2) \
{ value1.swap(value2); } \
} \
QT_BEGIN_NAMESPACE
#define Q_DECLARE_SHARED(TYPE) \
Q_DECLARE_TYPEINFO(TYPE, Q_MOVABLE_TYPE); \
template <> inline void qSwap<TYPE>(TYPE &value1, TYPE &value2) \
{ value1.swap(value2); } \
Q_DECLARE_SHARED_STL(TYPE)
/*
QTypeInfo primitive specializations
*/
Q_DECLARE_TYPEINFO(bool, Q_PRIMITIVE_TYPE);
Q_DECLARE_TYPEINFO(char, Q_PRIMITIVE_TYPE);
Q_DECLARE_TYPEINFO(signed char, Q_PRIMITIVE_TYPE);
Q_DECLARE_TYPEINFO(uchar, Q_PRIMITIVE_TYPE);
Q_DECLARE_TYPEINFO(short, Q_PRIMITIVE_TYPE);
Q_DECLARE_TYPEINFO(ushort, Q_PRIMITIVE_TYPE);
Q_DECLARE_TYPEINFO(int, Q_PRIMITIVE_TYPE);
Q_DECLARE_TYPEINFO(uint, Q_PRIMITIVE_TYPE);
Q_DECLARE_TYPEINFO(long, Q_PRIMITIVE_TYPE);
Q_DECLARE_TYPEINFO(ulong, Q_PRIMITIVE_TYPE);
Q_DECLARE_TYPEINFO(qint64, Q_PRIMITIVE_TYPE);
Q_DECLARE_TYPEINFO(quint64, Q_PRIMITIVE_TYPE);
Q_DECLARE_TYPEINFO(float, Q_PRIMITIVE_TYPE);
Q_DECLARE_TYPEINFO(double, Q_PRIMITIVE_TYPE);
#ifndef Q_OS_DARWIN
Q_DECLARE_TYPEINFO(long double, Q_PRIMITIVE_TYPE);
#endif
#if QT_VERSION >= QT_VERSION_CHECK(6,0,0)
// We can't do it now because it would break BC on QList<char32_t>
Q_DECLARE_TYPEINFO(char16_t, Q_PRIMITIVE_TYPE);
Q_DECLARE_TYPEINFO(char32_t, Q_PRIMITIVE_TYPE);
# if !defined(Q_CC_MSVC) || defined(_NATIVE_WCHAR_T_DEFINED)
Q_DECLARE_TYPEINFO(wchar_t, Q_PRIMITIVE_TYPE);
# endif
#endif // Qt 6
QT_END_NAMESPACE
#endif // QTYPEINFO_H
|
