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diff --git a/include/cppuhelper/implbase_ex.hxx b/include/cppuhelper/implbase_ex.hxx
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+++ b/include/cppuhelper/implbase_ex.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_IMPLBASE_EX_HXX
+#define INCLUDED_CPPUHELPER_IMPLBASE_EX_HXX
+
+#include "com/sun/star/uno/Any.h"
+#include "com/sun/star/uno/Sequence.h"
+#include "com/sun/star/uno/Type.h"
+#include "com/sun/star/uno/genfunc.h"
+#include "cppuhelper/cppuhelperdllapi.h"
+#include "sal/types.h"
+
+namespace cppu { class OWeakAggObject; }
+namespace cppu { class OWeakObject; }
+
+
+/* If you need to define implementation helper classes that deal with more than
+   12 interfaces, then use macros as follows, e.g. for 3 interfaces:
+
+#include <cppuhelper/implbase_ex_pre.hxx>
+#define __IFC_EX_TYPE_INIT3( class_cast ) \
+    __IFC_EX_TYPE_INIT( class_cast, 1 ), __IFC_EX_TYPE_INIT( class_cast, 2 ), \
+    __IFC_EX_TYPE_INIT( class_cast, 3 )
+#include <cppuhelper/implbase_ex_post.hxx>
+__DEF_IMPLHELPER_EX( 3 )
+*/
+
+/// @cond INTERNAL
+
+namespace cppu
+{
+
+/** function pointer signature for getCppuType
+*/
+typedef css::uno::Type const & (SAL_CALL * fptr_getCppuType)( void * );
+
+/** single type + object offset
+*/
+struct SAL_WARN_UNUSED type_entry
+{
+    /** the type_entry is initialized with function pointer to ::getCppuType() function first,
+        but holds an unacquired typelib_TypeDescriptionReference * after initialization,
+        thus reusing the memory.  Flag class_data::m_storedTypeRefs
+    */
+    union
+    {
+        fptr_getCppuType getCppuType;
+        typelib_TypeDescriptionReference * typeRef;
+    } m_type;
+    /** offset for interface pointer
+    */
+    sal_IntPtr m_offset;
+};
+
+/** in the future, this can be a constexpr template method */
+#define CPPUHELPER_DETAIL_TYPEENTRY(Ifc) \
+    { { Ifc::static_type }, \
+      reinterpret_cast<sal_IntPtr>( static_cast<Ifc *>( reinterpret_cast<Impl *>(16) )) - 16 }
+
+/** identical dummy struct for casting class_dataN to class_data
+*/
+struct SAL_WARN_UNUSED class_data
+{
+    /** number of supported types in m_typeEntries
+    */
+    sal_Int16 m_nTypes;
+
+    /** determines whether m_typeEntries is initialized and carries unacquired type refs
+    */
+    sal_Bool m_storedTypeRefs;
+
+    /** determines whether an implementation id was created in m_id
+    */
+    sal_Bool m_createdId;
+
+    /** implementation id
+     */
+    sal_Int8 m_id[ 16 ];
+
+    /** type, object offset
+    */
+    type_entry m_typeEntries[ 1 ];
+};
+
+/** ImplHelper
+*/
+CPPUHELPER_DLLPUBLIC css::uno::Any SAL_CALL ImplHelper_query(
+    css::uno::Type const & rType,
+    class_data * cd,
+    void * that );
+/** ImplHelper
+*/
+CPPUHELPER_DLLPUBLIC css::uno::Any SAL_CALL ImplHelper_queryNoXInterface(
+    css::uno::Type const & rType,
+    class_data * cd,
+    void * that );
+/** ImplHelper
+*/
+CPPUHELPER_DLLPUBLIC css::uno::Sequence< css::uno::Type >
+SAL_CALL ImplHelper_getTypes(
+    class_data * cd );
+/** ImplHelper
+*/
+CPPUHELPER_DLLPUBLIC css::uno::Sequence< css::uno::Type >
+SAL_CALL ImplInhHelper_getTypes(
+    class_data * cd,
+    css::uno::Sequence< css::uno::Type > const & rAddTypes );
+/** ImplHelper
+*/
+CPPUHELPER_DLLPUBLIC css::uno::Sequence< sal_Int8 >
+SAL_CALL ImplHelper_getImplementationId(
+    class_data * cd );
+
+/** WeakImplHelper
+*/
+CPPUHELPER_DLLPUBLIC css::uno::Any SAL_CALL WeakImplHelper_query(
+    css::uno::Type const & rType,
+    class_data * cd,
+    void * that,
+    ::cppu::OWeakObject * pBase );
+/** WeakImplHelper
+*/
+CPPUHELPER_DLLPUBLIC css::uno::Sequence< css::uno::Type >
+SAL_CALL WeakImplHelper_getTypes(
+    class_data * cd );
+
+/** WeakAggImplHelper
+*/
+CPPUHELPER_DLLPUBLIC css::uno::Any
+SAL_CALL WeakAggImplHelper_queryAgg(
+    css::uno::Type const & rType,
+    class_data * cd,
+    void * that,
+    ::cppu::OWeakAggObject * pBase );
+/** WeakAggImplHelper
+*/
+CPPUHELPER_DLLPUBLIC css::uno::Sequence< css::uno::Type >
+SAL_CALL WeakAggImplHelper_getTypes(
+    class_data * cd );
+
+}
+
+/// @endcond
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */