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Diffstat (limited to 'src/corelib/text/qstringliteral.h')
-rw-r--r-- | src/corelib/text/qstringliteral.h | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/src/corelib/text/qstringliteral.h b/src/corelib/text/qstringliteral.h new file mode 100644 index 0000000000..603f19c0b4 --- /dev/null +++ b/src/corelib/text/qstringliteral.h @@ -0,0 +1,112 @@ +/**************************************************************************** +** +** Copyright (C) 2016 The Qt Company Ltd. +** Copyright (C) 2016 Intel Corporation. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the QtCore module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** 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. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef QSTRINGLITERAL_H +#define QSTRINGLITERAL_H + +#include <QtCore/qarraydata.h> + +#if 0 +#pragma qt_class(QStringLiteral) +#endif + +QT_BEGIN_NAMESPACE + +typedef QTypedArrayData<ushort> QStringData; + +// all our supported compilers support Unicode string literals, +// even if their Q_COMPILER_UNICODE_STRING has been revoked due +// to lacking stdlib support. But QStringLiteral only needs the +// core language feature, so just use u"" here unconditionally: + +typedef char16_t qunicodechar; + +Q_STATIC_ASSERT_X(sizeof(qunicodechar) == 2, + "qunicodechar must typedef an integral type of size 2"); + +#define QT_UNICODE_LITERAL(str) u"" str +#define QStringLiteral(str) \ + ([]() noexcept -> QString { \ + enum { Size = sizeof(QT_UNICODE_LITERAL(str))/2 - 1 }; \ + static const QStaticStringData<Size> qstring_literal = { \ + Q_STATIC_STRING_DATA_HEADER_INITIALIZER(Size), \ + QT_UNICODE_LITERAL(str) }; \ + QStringDataPtr holder = { qstring_literal.data_ptr() }; \ + const QString qstring_literal_temp(holder); \ + return qstring_literal_temp; \ + }()) \ + /**/ + +#define Q_STATIC_STRING_DATA_HEADER_INITIALIZER_WITH_OFFSET(size, offset) \ + { Q_REFCOUNT_INITIALIZE_STATIC, size, 0, 0, offset } \ + /**/ + +#define Q_STATIC_STRING_DATA_HEADER_INITIALIZER(size) \ + Q_STATIC_STRING_DATA_HEADER_INITIALIZER_WITH_OFFSET(size, sizeof(QStringData)) \ + /**/ + +#ifndef QT_NO_UNICODE_LITERAL +# ifndef QT_UNICODE_LITERAL +# error "If you change QStringLiteral, please change QStringViewLiteral, too" +# endif +# define QStringViewLiteral(str) QStringView(QT_UNICODE_LITERAL(str)) +#endif + +template <int N> +struct QStaticStringData +{ + QArrayData str; + qunicodechar data[N + 1]; + + QStringData *data_ptr() const + { + Q_ASSERT(str.ref.isStatic()); + return const_cast<QStringData *>(static_cast<const QStringData*>(&str)); + } +}; + +struct QStringDataPtr +{ + QStringData *ptr; +}; + +QT_END_NAMESPACE + +#endif // QSTRINGLITERAL_H |