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diff --git a/bridges/inc/unointerfaceproxy.hxx b/bridges/inc/unointerfaceproxy.hxx
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+++ b/bridges/inc/unointerfaceproxy.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * 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 INCLUDED_BRIDGES_INC_UNOINTERFACEPROXY_HXX
+#define INCLUDED_BRIDGES_INC_UNOINTERFACEPROXY_HXX
+
+#include <sal/config.h>
+
+#include <atomic>
+#include <cstddef>
+
+#include <rtl/ustring.hxx>
+#include <sal/types.h>
+#include <typelib/typedescription.h>
+#include <uno/dispatcher.h>
+#include <uno/environment.h>
+
+namespace com::sun::star::uno { class XInterface; }
+
+namespace bridges::cpp_uno::shared {
+
+class Bridge;
+
+extern "C" void freeUnoInterfaceProxy(
+    uno_ExtEnvironment * pEnv, void * pProxy);
+
+// private:
+extern "C" void unoInterfaceProxyDispatch(
+    uno_Interface * pUnoI, typelib_TypeDescription const * pMemberDescr,
+    void * pReturn, void * pArgs[], uno_Any ** ppException);
+    // this function is not defined in the generic part, but instead has to be
+    // defined individually for each CPP--UNO bridge
+
+// private:
+extern "C" void acquireProxy(uno_Interface *);
+
+// private:
+extern "C" void releaseProxy(uno_Interface *);
+
+/**
+ * A uno proxy wrapping a cpp interface.
+ */
+class UnoInterfaceProxy: public uno_Interface {
+public:
+    // Interface for Bridge:
+
+    static UnoInterfaceProxy * create(
+        Bridge * pBridge, com::sun::star::uno::XInterface * pCppI,
+        typelib_InterfaceTypeDescription * pTypeDescr,
+        OUString const & rOId);
+
+    // Interface for individual CPP--UNO bridges:
+
+    Bridge * getBridge() { return pBridge; }
+    com::sun::star::uno::XInterface * getCppI() { return pCppI; }
+
+private:
+    UnoInterfaceProxy(UnoInterfaceProxy const &) = delete;
+    UnoInterfaceProxy& operator =(const UnoInterfaceProxy&) = delete;
+
+    UnoInterfaceProxy(
+        Bridge * pBridge_, com::sun::star::uno::XInterface * pCppI_,
+        typelib_InterfaceTypeDescription * pTypeDescr_,
+        OUString const & rOId_);
+
+    ~UnoInterfaceProxy();
+
+    std::atomic<std::size_t> nRef;
+    Bridge * pBridge;
+
+    // mapping information
+    com::sun::star::uno::XInterface * pCppI; // wrapped interface
+    typelib_InterfaceTypeDescription * pTypeDescr;
+    OUString oid;
+
+    friend void freeUnoInterfaceProxy(
+        uno_ExtEnvironment * pEnv, void * pProxy);
+
+    friend void unoInterfaceProxyDispatch(
+        uno_Interface * pUnoI, typelib_TypeDescription const * pMemberDescr,
+        void * pReturn, void * pArgs[], uno_Any ** ppException);
+
+    friend void acquireProxy(uno_Interface * pUnoI);
+
+    friend void releaseProxy(uno_Interface * pUnoI);
+};
+
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */