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diff --git a/include/cppuhelper/compbase.hxx b/include/cppuhelper/compbase.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_CPPUHELPER_COMPBASE_HXX
+#define INCLUDED_CPPUHELPER_COMPBASE_HXX
+
+#include "sal/config.h"
+
+#include "com/sun/star/lang/XTypeProvider.hpp"
+#include "com/sun/star/uno/Any.h"
+#include "com/sun/star/uno/Reference.h"
+#include "com/sun/star/uno/Sequence.h"
+#include "com/sun/star/uno/Type.h"
+#include "cppuhelper/compbase_ex.hxx"
+#include "cppuhelper/implbase.hxx"
+#include "rtl/instance.hxx"
+#include "sal/types.h"
+
+namespace com { namespace sun { namespace star { namespace lang {
+    class XEventListener;
+} } } }
+namespace osl { class Mutex; }
+
+#if defined LIBO_INTERNAL_ONLY
+
+// A replacement for WeakAggComponentImplHelper1 has deliberately been left out,
+// as the underlying aggregation mechanism is known broken in general and should
+// not be used.
+
+namespace cppu {
+
+/** Implementation helper implementing interfaces
+    css::uno::XInterface, css::lang::XTypeProvider, and
+    css::lang::XComponent.
+
+    Like WeakComponentImplHelper, but does not define
+    XComponent::add/removeEventListener.  Use for classes deriving from multiple
+    UNO interfaces with competing add/removeEventListener methods, to avoid
+    warnings about hiding of overloaded virtual functions.
+
+    Upon disposing objects of this class, sub-classes receive a disposing()
+    call.
+
+    @attention
+    The mutex reference passed to the constructor has to outlive the constructed
+    instance.
+*/
+template<typename... Ifc>
+class SAL_NO_VTABLE SAL_DLLPUBLIC_TEMPLATE PartialWeakComponentImplHelper:
+    public WeakComponentImplHelperBase, public css::lang::XTypeProvider,
+    public Ifc...
+{
+    struct cd:
+        rtl::StaticAggregate<
+            class_data,
+            detail::ImplClassData<PartialWeakComponentImplHelper, Ifc...>>
+    {};
+
+public:
+    PartialWeakComponentImplHelper(osl::Mutex & mutex) throw ():
+        WeakComponentImplHelperBase(mutex) {}
+
+    css::uno::Any SAL_CALL queryInterface(css::uno::Type const & aType) SAL_OVERRIDE
+    { return WeakComponentImplHelper_query(aType, cd::get(), this, this); }
+
+    void SAL_CALL acquire() throw () SAL_OVERRIDE
+    { WeakComponentImplHelperBase::acquire(); }
+
+    void SAL_CALL release() throw () SAL_OVERRIDE
+    { WeakComponentImplHelperBase::release(); }
+
+    void SAL_CALL dispose()
+        SAL_OVERRIDE
+    { WeakComponentImplHelperBase::dispose(); }
+
+    css::uno::Sequence<css::uno::Type> SAL_CALL getTypes() SAL_OVERRIDE
+    { return WeakComponentImplHelper_getTypes(cd::get()); }
+
+    css::uno::Sequence<sal_Int8> SAL_CALL getImplementationId() SAL_OVERRIDE
+    { return css::uno::Sequence<sal_Int8>(); }
+};
+
+/** Implementation helper implementing interfaces
+    css::uno::XInterface, css::lang::XTypeProvider, and
+    css::lang::XComponent.
+
+    Upon disposing objects of this class, sub-classes receive a disposing()
+    call.
+
+    @attention
+    The mutex reference passed to the constructor has to outlive the constructed
+    instance.
+*/
+template<typename... Ifc>
+class SAL_NO_VTABLE SAL_DLLPUBLIC_TEMPLATE WeakComponentImplHelper:
+    public PartialWeakComponentImplHelper<Ifc...>
+{
+public:
+    WeakComponentImplHelper(osl::Mutex & mutex) throw ():
+        PartialWeakComponentImplHelper<Ifc...>(mutex) {}
+
+    void SAL_CALL addEventListener(
+        css::uno::Reference<css::lang::XEventListener> const & xListener) SAL_OVERRIDE
+    { WeakComponentImplHelperBase::addEventListener(xListener); }
+
+    void SAL_CALL removeEventListener(
+        css::uno::Reference<css::lang::XEventListener> const & aListener) SAL_OVERRIDE
+    { WeakComponentImplHelperBase::removeEventListener(aListener); }
+};
+
+}
+
+#endif
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */