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diff --git a/src/corelib/serialization/qbinaryjsonvalue_p.h b/src/corelib/serialization/qbinaryjsonvalue_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** 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 QBINARYJSONVALUE_P_H
+#define QBINARYJSONVALUE_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/qglobal.h>
+#include <QtCore/qstring.h>
+#include <QtCore/qjsonvalue.h>
+
+QT_REQUIRE_CONFIG(binaryjson);
+
+QT_BEGIN_NAMESPACE
+
+class QBinaryJsonArray;
+class QBinaryJsonObject;
+
+namespace QBinaryJsonPrivate {
+class ConstData;
+class MutableData;
+class Base;
+class Value;
+class Object;
+class Array;
+}
+
+class Q_CORE_EXPORT QBinaryJsonValue
+{
+    Q_DISABLE_COPY(QBinaryJsonValue)
+public:
+    explicit QBinaryJsonValue(QJsonValue::Type type) : ui(0), t(type) {}
+    explicit QBinaryJsonValue(bool b) : b(b), t(QJsonValue::Bool) {}
+    explicit QBinaryJsonValue(double n) : dbl(n), t(QJsonValue::Double) {}
+    explicit QBinaryJsonValue(QString s);
+    QBinaryJsonValue(const QBinaryJsonArray &a);
+    QBinaryJsonValue(const QBinaryJsonObject &o);
+
+    ~QBinaryJsonValue();
+
+    QBinaryJsonValue(QBinaryJsonValue &&other) noexcept
+        : ui(other.ui),
+          d(other.d),
+          t(other.t)
+    {
+        other.ui = 0;
+        other.d = nullptr;
+        other.t = QJsonValue::Null;
+    }
+
+    QBinaryJsonValue &operator =(QBinaryJsonValue &&other) noexcept
+    {
+        qSwap(ui, other.ui);
+        qSwap(d, other.d);
+        qSwap(t, other.t);
+        return *this;
+    }
+
+    static QBinaryJsonValue fromJsonValue(const QJsonValue &json);
+    QJsonValue::Type type() const { return t; }
+    bool toBool() const { return (t == QJsonValue::Bool) && b; }
+    double toDouble() const { return (t == QJsonValue::Double) ? dbl : 0; }
+    QString toString() const;
+
+private:
+    friend class QBinaryJsonPrivate::Value;
+    friend class QBinaryJsonArray;
+    friend class QBinaryJsonObject;
+
+    QBinaryJsonValue(QBinaryJsonPrivate::MutableData *d, QBinaryJsonPrivate::Base *parent,
+                     const QBinaryJsonPrivate::Value &v);
+
+    void detach();
+
+    union {
+        quint64 ui;
+        bool b;
+        double dbl;
+        QStringData *stringData;
+        const QBinaryJsonPrivate::Base *base;
+    };
+    QBinaryJsonPrivate::MutableData *d = nullptr; // needed for Objects and Arrays
+    QJsonValue::Type t = QJsonValue::Null;
+};
+
+QT_END_NAMESPACE
+
+#endif // QBINARYJSONVALUE_P_H