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diff --git a/sfx2/source/sidebar/AsynchronousCall.hxx b/sfx2/source/sidebar/AsynchronousCall.hxx
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+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+#ifndef SFX_SIDEBAR_ASYNCHRONOUS_CALL_HXX
+#define SFX_SIDEBAR_ASYNCHRONOUS_CALL_HXX
+
+#include <boost/function.hpp>
+#include <tools/solar.h>
+#include <tools/link.hxx>
+
+namespace sfx2 { namespace sidebar {
+
+/** A simple asynchronous call via Application::PostUserCall.
+*/
+class AsynchronousCall
+{
+public:
+    typedef ::boost::function<void(void)> Action;
+
+    AsynchronousCall (const Action& rAction);
+    ~AsynchronousCall (void);
+
+    void RequestCall (const Action& rAction);
+    void RequestCall (void);
+    void CancelRequest (void);
+
+private:
+    Action maAction;
+    sal_uLong mnCallId;
+
+    DECL_LINK(HandleUserCall, void*);
+};
+
+
+} } // end of namespace sfx2::sidebar
+
+#endif