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1 : /****************************************************************************
2 : **
3 : ** Copyright (C) 2016 The Qt Company Ltd.
4 : ** Copyright (C) 2016 Intel Corporation.
5 : ** Contact: https://www.qt.io/licensing/
6 : **
7 : ** This file is part of the QtCore module of the Qt Toolkit.
8 : **
9 : ** $QT_BEGIN_LICENSE:LGPL$
10 : ** Commercial License Usage
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16 : ** information use the contact form at https://www.qt.io/contact-us.
17 : **
18 : ** GNU Lesser General Public License Usage
19 : ** Alternatively, this file may be used under the terms of the GNU Lesser
20 : ** General Public License version 3 as published by the Free Software
21 : ** Foundation and appearing in the file LICENSE.LGPL3 included in the
22 : ** packaging of this file. Please review the following information to
23 : ** ensure the GNU Lesser General Public License version 3 requirements
24 : ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
25 : **
26 : ** GNU General Public License Usage
27 : ** Alternatively, this file may be used under the terms of the GNU
28 : ** General Public License version 2.0 or (at your option) the GNU General
29 : ** Public license version 3 or any later version approved by the KDE Free
30 : ** Qt Foundation. The licenses are as published by the Free Software
31 : ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
32 : ** included in the packaging of this file. Please review the following
33 : ** information to ensure the GNU General Public License requirements will
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38 : **
39 : ****************************************************************************/
40 :
41 : #ifndef QSTRINGLITERAL_H
42 : #define QSTRINGLITERAL_H
43 :
44 : #include <QtCore/qarraydata.h>
45 :
46 : #if 0
47 : #pragma qt_class(QStringLiteral)
48 : #endif
49 :
50 : QT_BEGIN_NAMESPACE
51 :
52 : typedef QTypedArrayData<ushort> QStringData;
53 :
54 : #if defined(Q_OS_WIN) && !defined(Q_COMPILER_UNICODE_STRINGS)
55 : // fall back to wchar_t if the a Windows compiler does not
56 : // support Unicode string literals, assuming wchar_t is 2 bytes
57 : // on that platform (sanity-checked by static_assert further below)
58 :
59 : #if defined(Q_CC_MSVC)
60 : # define QT_UNICODE_LITERAL_II(str) L##str
61 : #else
62 : # define QT_UNICODE_LITERAL_II(str) L"" str
63 : #endif
64 : typedef wchar_t qunicodechar;
65 :
66 : #else
67 : // all our supported compilers support Unicode string literals,
68 : // even if their Q_COMPILER_UNICODE_STRING has been revoked due
69 : // to lacking stdlib support. But QStringLiteral only needs the
70 : // core language feature, so just use u"" here unconditionally:
71 :
72 : #define QT_UNICODE_LITERAL_II(str) u"" str
73 : typedef char16_t qunicodechar;
74 :
75 : #endif
76 :
77 : Q_STATIC_ASSERT_X(sizeof(qunicodechar) == 2,
78 : "qunicodechar must typedef an integral type of size 2");
79 :
80 : #define QT_UNICODE_LITERAL(str) QT_UNICODE_LITERAL_II(str)
81 : #define QStringLiteral(str) \
82 : ([]() Q_DECL_NOEXCEPT -> QString { \
83 : enum { Size = sizeof(QT_UNICODE_LITERAL(str))/2 - 1 }; \
84 : static const QStaticStringData<Size> qstring_literal = { \
85 : Q_STATIC_STRING_DATA_HEADER_INITIALIZER(Size), \
86 : QT_UNICODE_LITERAL(str) }; \
87 : QStringDataPtr holder = { qstring_literal.data_ptr() }; \
88 : const QString qstring_literal_temp(holder); \
89 : return qstring_literal_temp; \
90 : }()) \
91 : /**/
92 :
93 : #define Q_STATIC_STRING_DATA_HEADER_INITIALIZER_WITH_OFFSET(size, offset) \
94 : { Q_REFCOUNT_INITIALIZE_STATIC, size, 0, 0, offset } \
95 : /**/
96 :
97 : #define Q_STATIC_STRING_DATA_HEADER_INITIALIZER(size) \
98 : Q_STATIC_STRING_DATA_HEADER_INITIALIZER_WITH_OFFSET(size, sizeof(QStringData)) \
99 : /**/
100 :
101 : #ifndef QT_NO_UNICODE_LITERAL
102 : # ifndef QT_UNICODE_LITERAL
103 : # error "If you change QStringLiteral, please change QStringViewLiteral, too"
104 : # endif
105 : # define QStringViewLiteral(str) QStringView(QT_UNICODE_LITERAL(str))
106 : #endif
107 :
108 : template <int N>
109 : struct QStaticStringData
110 : {
111 : QArrayData str;
112 : qunicodechar data[N + 1];
113 :
114 212 : QStringData *data_ptr() const
115 : {
116 212 : Q_ASSERT(str.ref.isStatic());
117 212 : return const_cast<QStringData *>(static_cast<const QStringData*>(&str));
118 : }
119 : };
120 :
121 : struct QStringDataPtr
122 : {
123 : QStringData *ptr;
124 : };
125 :
126 : QT_END_NAMESPACE
127 :
128 : #endif // QSTRINGLITERAL_H
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