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diff --git a/examples/corelib/serialization/convert/converter.h b/examples/corelib/serialization/convert/converter.h
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+/****************************************************************************
+**
+** Copyright (C) 2018 Intel Corporation.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** 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.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef CONVERTER_H
+#define CONVERTER_H
+
+#include <QIODevice>
+#include <QPair>
+#include <QVariant>
+#include <QVector>
+
+class VariantOrderedMap : public QVector<QPair<QVariant, QVariant>>
+{
+public:
+    VariantOrderedMap() = default;
+    VariantOrderedMap(const QVariantMap &map)
+    {
+        reserve(map.size());
+        for (auto it = map.begin(); it != map.end(); ++it)
+            append({it.key(), it.value()});
+    }
+};
+using Map = VariantOrderedMap;
+Q_DECLARE_METATYPE(Map)
+
+class Converter
+{
+protected:
+    Converter();
+
+public:
+    static Converter *null;
+
+    enum Direction {
+        In = 1, Out = 2, InOut = 3
+    };
+
+    enum Option {
+        SupportsArbitraryMapKeys = 0x01
+    };
+    Q_DECLARE_FLAGS(Options, Option)
+
+    virtual ~Converter() = 0;
+
+    virtual QString name() = 0;
+    virtual Direction directions() = 0;
+    virtual Options outputOptions() = 0;
+    virtual const char *optionsHelp() = 0;
+    virtual bool probeFile(QIODevice *f) = 0;
+    virtual QVariant loadFile(QIODevice *f, Converter *&outputConverter) = 0;
+    virtual void saveFile(QIODevice *f, const QVariant &contents, const QStringList &options) = 0;
+};
+
+Q_DECLARE_OPERATORS_FOR_FLAGS(Converter::Options)
+
+#endif // CONVERTER_H