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diff --git a/svx/source/inc/svdoutlinercache.hxx b/svx/source/inc/svdoutlinercache.hxx
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+++ b/svx/source/inc/svdoutlinercache.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_SVX_SOURCE_INC_SVDOUTLINERCACHE_HXX
+#define INCLUDED_SVX_SOURCE_INC_SVDOUTLINERCACHE_HXX
+
+#include <memory>
+#include <vector>
+#include <o3tl/sorted_vector.hxx>
+
+class SdrModel;
+class SdrOutliner;
+enum class OutlinerMode;
+
+class SdrOutlinerCache
+{
+private:
+    SdrModel*                    mpModel;
+    std::vector< std::unique_ptr<SdrOutliner> >  maModeOutline;
+    std::vector< std::unique_ptr<SdrOutliner> >  maModeText;
+    o3tl::sorted_vector< SdrOutliner* >          maActiveOutliners;
+
+public:
+    SdrOutlinerCache( SdrModel* pModel );
+    ~SdrOutlinerCache();
+
+    std::unique_ptr<SdrOutliner> createOutliner( OutlinerMode nOutlinerMode );
+    void disposeOutliner( std::unique_ptr<SdrOutliner> pOutliner );
+    std::vector< SdrOutliner* > GetActiveOutliners() const;
+};
+
+#endif
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */