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diff --git a/include/codemaker/generatedtypeset.hxx b/include/codemaker/generatedtypeset.hxx
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+++ b/include/codemaker/generatedtypeset.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_CODEMAKER_GENERATEDTYPESET_HXX
+#define INCLUDED_CODEMAKER_GENERATEDTYPESET_HXX
+
+#include <rtl/string.hxx>
+
+#include <unordered_set>
+
+/// @HTML
+
+namespace codemaker
+{
+/**
+   A simple class to track which types have already been processed by a code
+   maker.
+
+   <p>This class is not multi-thread&ndash;safe.</p>
+ */
+class GeneratedTypeSet
+{
+public:
+    GeneratedTypeSet() {}
+
+    /**
+       Add a type to the set of generated types.
+
+       <p>If the type was already present, nothing happens.</p>
+
+       @param type a UNO type registry name
+     */
+    void add(OString const& type) { m_set.insert(type); }
+
+    /**
+       Checks whether a given type has already been generated.
+
+       @param type a UNO type registry name
+
+       @return true iff the given type has already been generated
+     */
+    bool contains(OString const& type) const { return m_set.find(type) != m_set.end(); }
+
+private:
+    GeneratedTypeSet(GeneratedTypeSet const&) = delete;
+    GeneratedTypeSet& operator=(GeneratedTypeSet const&) = delete;
+
+    std::unordered_set<OString> m_set;
+};
+}
+
+#endif // INCLUDED_CODEMAKER_GENERATEDTYPESET_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */