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diff --git a/src/core/api/qwebenginecallback.h b/src/core/api/qwebenginecallback.h
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+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtWebEngine 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://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.LGPLv3 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.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 later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QWEBENGINECALLBACK_H
+#define QWEBENGINECALLBACK_H
+
+#include "qtwebenginecoreglobal.h"
+
+#include <QtCore/qcompilerdetection.h> // Needed for Q_DECL_OVERRIDE
+#include <QExplicitlySharedDataPointer>
+#include <QString>
+#include <QVariant>
+
+namespace QtWebEngineCore {
+class CallbackDirectory;
+}
+
+QT_BEGIN_NAMESPACE
+
+namespace QtWebEnginePrivate {
+
+template <typename T>
+class QWebEngineCallbackPrivateBase : public QSharedData {
+public:
+    QWebEngineCallbackPrivateBase() {}
+    virtual ~QWebEngineCallbackPrivateBase() {}
+    virtual void operator()(T) = 0;
+};
+
+template <typename T, typename F>
+class QWebEngineCallbackPrivate : public QWebEngineCallbackPrivateBase<T> {
+public:
+    QWebEngineCallbackPrivate(F callable)
+        : m_callable(callable)
+    {}
+    virtual void operator()(T value) Q_DECL_OVERRIDE { m_callable(value); }
+private:
+    F m_callable;
+};
+
+} // namespace QtWebEnginePrivate
+
+template <typename T>
+class QWebEngineCallback {
+public:
+    template <typename F>
+    QWebEngineCallback(F f)
+        : d(new QtWebEnginePrivate::QWebEngineCallbackPrivate<T, F>(f))
+    { }
+    QWebEngineCallback() { }
+    operator bool() const { return d; }
+private:
+    friend class QtWebEngineCore::CallbackDirectory;
+    QExplicitlySharedDataPointer<QtWebEnginePrivate::QWebEngineCallbackPrivateBase<T> > d;
+};
+
+QT_END_NAMESPACE
+
+#endif // QWEBENGINECALLBACK_H