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diff --git a/src/corelib/text/qcollator.h b/src/corelib/text/qcollator.h
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+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Copyright (C) 2013 Aleix Pol Gonzalez <aleixpol@kde.org>
+** 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 QCOLLATOR_H
+#define QCOLLATOR_H
+
+#include <QtCore/qstring.h>
+#include <QtCore/qstringlist.h>
+#include <QtCore/qlocale.h>
+
+QT_BEGIN_NAMESPACE
+
+class QCollatorPrivate;
+class QCollatorSortKeyPrivate;
+
+class Q_CORE_EXPORT QCollatorSortKey
+{
+    friend class QCollator;
+public:
+    QCollatorSortKey(const QCollatorSortKey &other);
+    ~QCollatorSortKey();
+    QCollatorSortKey &operator=(const QCollatorSortKey &other);
+    inline QCollatorSortKey &operator=(QCollatorSortKey &&other) noexcept
+    { swap(other); return *this; }
+    void swap(QCollatorSortKey &other) noexcept
+    { d.swap(other.d); }
+
+    int compare(const QCollatorSortKey &key) const;
+
+protected:
+    QCollatorSortKey(QCollatorSortKeyPrivate*);
+
+    QExplicitlySharedDataPointer<QCollatorSortKeyPrivate> d;
+
+private:
+    QCollatorSortKey();
+};
+
+inline bool operator<(const QCollatorSortKey &lhs, const QCollatorSortKey &rhs)
+{
+    return lhs.compare(rhs) < 0;
+}
+
+class Q_CORE_EXPORT QCollator
+{
+public:
+    QCollator();
+    explicit QCollator(const QLocale &locale);
+    QCollator(const QCollator &);
+    ~QCollator();
+    QCollator &operator=(const QCollator &);
+    QCollator(QCollator &&other) noexcept
+        : d(other.d) { other.d = nullptr; }
+    QCollator &operator=(QCollator &&other) noexcept
+    { swap(other); return *this; }
+
+    void swap(QCollator &other) noexcept
+    { qSwap(d, other.d); }
+
+    void setLocale(const QLocale &locale);
+    QLocale locale() const;
+
+    Qt::CaseSensitivity caseSensitivity() const;
+    void setCaseSensitivity(Qt::CaseSensitivity cs);
+
+    void setNumericMode(bool on);
+    bool numericMode() const;
+
+    void setIgnorePunctuation(bool on);
+    bool ignorePunctuation() const;
+
+#if QT_STRINGVIEW_LEVEL < 2
+    int compare(const QString &s1, const QString &s2) const;
+    int compare(const QStringRef &s1, const QStringRef &s2) const;
+    int compare(const QChar *s1, int len1, const QChar *s2, int len2) const;
+
+    bool operator()(const QString &s1, const QString &s2) const
+    { return compare(s1, s2) < 0; }
+#endif
+    int compare(QStringView s1, QStringView s2) const;
+
+    bool operator()(QStringView s1, QStringView s2) const
+    { return compare(s1, s2) < 0; }
+
+    QCollatorSortKey sortKey(const QString &string) const;
+
+private:
+    QCollatorPrivate *d;
+
+    void detach();
+};
+
+Q_DECLARE_SHARED(QCollatorSortKey)
+Q_DECLARE_SHARED(QCollator)
+
+QT_END_NAMESPACE
+
+#endif // QCOLLATOR_P_H