qt.core.stringliteral source code

1 /****************************************************************************
2 **
3 ** DQt - D bindings for the Qt Toolkit
4 **
5 ** GNU Lesser General Public License Usage
6 ** This file may be used under the terms of the GNU Lesser
7 ** General Public License version 3 as published by the Free Software
8 ** Foundation and appearing in the file LICENSE.LGPL3 included in the
9 ** packaging of this file. Please review the following information to
10 ** ensure the GNU Lesser General Public License version 3 requirements
11 ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
12 **
13 ****************************************************************************/
14 module qt.core.stringliteral;
15 extern(C++):
16 
17 import qt.config;
18 import qt.core.arraydata;
19 import qt.helpers;
20 
21 /+ #if 0
22 #pragma qt_class(QStringLiteral)
23 #endif +/
24 
25 
26 alias QStringData = QTypedArrayData!(ushort);
27 
28 // all our supported compilers support Unicode string literals,
29 // even if their Q_COMPILER_UNICODE_STRING has been revoked due
30 // to lacking stdlib support. But QStringLiteral only needs the
31 // core language feature, so just use u"" here unconditionally:
32 
33 alias qunicodechar = wchar;
34 
35 /+ Q_STATIC_ASSERT_X(sizeof(qunicodechar) == 2,
36         "qunicodechar must typedef an integral type of size 2");
37 
38 #define QT_UNICODE_LITERAL(str) u"" str
39 #define QStringLiteral(str) \
40     ([]() noexcept -> QString { \
41         enum { Size = sizeof(QT_UNICODE_LITERAL(str))/2 - 1 }; \
42         static const QStaticStringData<Size> qstring_literal = { \
43             Q_STATIC_STRING_DATA_HEADER_INITIALIZER(Size), \
44             QT_UNICODE_LITERAL(str) }; \
45         QStringDataPtr holder = { qstring_literal.data_ptr() }; \
46         return QString(holder); \
47     }()) \
48     /**/
49 
50 #define Q_STATIC_STRING_DATA_HEADER_INITIALIZER_WITH_OFFSET(size, offset) \
51     { Q_REFCOUNT_INITIALIZE_STATIC, size, 0, 0, offset } \
52     /**/
53 
54 #define Q_STATIC_STRING_DATA_HEADER_INITIALIZER(size) \
55     Q_STATIC_STRING_DATA_HEADER_INITIALIZER_WITH_OFFSET(size, sizeof(QStringData)) \
56     /**/
57 
58 #if QT_DEPRECATED_SINCE(5, 14)
59 # define QStringViewLiteral(str) QStringView(QT_UNICODE_LITERAL(str), QtPrivate::Deprecated)
60 #endif
61 
62 template <int N>
63 struct QStaticStringData
64 {
65     QArrayData str;
66     qunicodechar data[N + 1];
67 
68     QStringData *data_ptr() const
69     {
70         Q_ASSERT(str.ref.isStatic());
71         return const_cast<QStringData *>(static_cast<const QStringData*>(&str));
72     }
73 }; +/
74 
75 struct QStringDataPtr
76 {
77     QStringData* ptr;
78 }
79