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diff --git a/src/client/global/qwaylandclientextension.h b/src/client/global/qwaylandclientextension.h
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+++ b/src/client/global/qwaylandclientextension.h
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+/****************************************************************************
+**
+** Copyright (C) 2016 Erik Larsson.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtWaylandCompositor module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 QWAYLANDCLIENTEXTENSION_H
+#define QWAYLANDCLIENTEXTENSION_H
+
+#include <QObject>
+#include <QtWaylandClient/qwaylandclientexport.h>
+
+struct wl_registry;
+
+QT_BEGIN_NAMESPACE
+
+namespace QtWaylandClient {
+class QWaylandIntegration;
+}
+
+class QWaylandClientExtensionPrivate;
+class QWaylandClientExtensionTemplatePrivate;
+
+class Q_WAYLAND_CLIENT_EXPORT QWaylandClientExtension : public QObject
+{
+    Q_OBJECT
+    Q_DECLARE_PRIVATE(QWaylandClientExtension)
+    Q_PROPERTY(int protocolVersion READ version NOTIFY versionChanged)
+    Q_PROPERTY(bool active READ isActive NOTIFY activeChanged)
+public:
+    QWaylandClientExtension(const int version);
+
+    QtWaylandClient::QWaylandIntegration *integration() const;
+    int version() const;
+    bool isActive() const;
+
+    virtual const struct wl_interface *extensionInterface() const = 0;
+    virtual void bind(struct ::wl_registry *registry, int id, int version) = 0;
+protected:
+    void setVersion(const int version);
+Q_SIGNALS:
+    void versionChanged();
+    void activeChanged();
+};
+
+template <typename T>
+class Q_WAYLAND_CLIENT_EXPORT QWaylandClientExtensionTemplate : public QWaylandClientExtension
+{
+    Q_DECLARE_PRIVATE(QWaylandClientExtensionTemplate)
+public:
+    QWaylandClientExtensionTemplate(const int ver) :
+        QWaylandClientExtension(ver)
+    {
+    }
+
+    const struct wl_interface *extensionInterface() const Q_DECL_OVERRIDE
+    {
+        return T::interface();
+    }
+
+    void bind(struct ::wl_registry *registry, int id, int ver)
+    {
+        T* instance = static_cast<T *>(this);
+        // Make sure lowest version is used of the supplied version from the
+        // developer and the version specified in the protocol and also the
+        // compositor version.
+        if (this->version() > T::interface()->version) {
+            qWarning("Supplied protocol version to QWaylandClientExtensionTemplate is higher than the version of the protocol, using protocol version instead.");
+        }
+        int minVersion = qMin(ver, qMin(T::interface()->version, this->version()));
+        setVersion(minVersion);
+        instance->init(registry, id, minVersion);
+    }
+};
+
+QT_END_NAMESPACE
+
+#endif // QWAYLANDCLIENTEXTENSION_H