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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
50QT_BEGIN_NAMESPACE
51
52typedef QTypedArrayData<ushort> QStringData;
53
54// all our supported compilers support Unicode string literals,
55// even if their Q_COMPILER_UNICODE_STRING has been revoked due
56// to lacking stdlib support. But QStringLiteral only needs the
57// core language feature, so just use u"" here unconditionally:
58
59typedef char16_t qunicodechar;
60
61Q_STATIC_ASSERT_X(sizeof(qunicodechar) == 2,
62 "qunicodechar must typedef an integral type of size 2");
63
64#define QT_UNICODE_LITERAL(str) u"" str
65#define QStringLiteral(str) \
66 ([]() noexcept -> QString { \
67 enum { Size = sizeof(QT_UNICODE_LITERAL(str))/2 - 1 }; \
68 static const QStaticStringData<Size> qstring_literal = { \
69 Q_STATIC_STRING_DATA_HEADER_INITIALIZER(Size), \
70 QT_UNICODE_LITERAL(str) }; \
71 QStringDataPtr holder = { qstring_literal.data_ptr() }; \
72 return QString(holder); \
73 }()) \
74 /**/
75
76#define Q_STATIC_STRING_DATA_HEADER_INITIALIZER_WITH_OFFSET(size, offset) \
77 { Q_REFCOUNT_INITIALIZE_STATIC, size, 0, 0, offset } \
78 /**/
79
80#define Q_STATIC_STRING_DATA_HEADER_INITIALIZER(size) \
81 Q_STATIC_STRING_DATA_HEADER_INITIALIZER_WITH_OFFSET(size, sizeof(QStringData)) \
82 /**/
83
84#if QT_DEPRECATED_SINCE(5, 14)
85# define QStringViewLiteral(str) QStringView(QT_UNICODE_LITERAL(str), QtPrivate::Deprecated)
86#endif
87
88template <int N>
89struct QStaticStringData
90{
91 QArrayData str;
92 qunicodechar data[N + 1];
93
94 QStringData *data_ptr() const
95 {
96 Q_ASSERT(str.ref.isStatic());
97 return const_cast<QStringData *>(static_cast<const QStringData*>(&str));
98 }
99};
100
101struct QStringDataPtr
102{
103 QStringData *ptr;
104};
105
106QT_END_NAMESPACE
107
108#endif // QSTRINGLITERAL_H
109

source code of qtbase/src/corelib/text/qstringliteral.h