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diff --git a/sc/inc/generalfunction.hxx b/sc/inc/generalfunction.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 .
+ */
+#pragma once
+
+#include <com/sun/star/sheet/GeneralFunction.hpp>
+#include <com/sun/star/sheet/GeneralFunction2.hpp>
+
+/**
+ * the css::sheet::GeneralFunction enum is extended by constants in GeneralFunction2, which causes some type-safety issues.
+ * So abstract them behind the facade of this enum.
+ */
+enum class ScGeneralFunction
+{
+    /** nothing is calculated.
+     */
+    NONE = int(css::sheet::GeneralFunction_NONE),
+
+    /** function is determined automatically.
+
+        <p>If the values are all numerical, SUM is used, otherwise COUNT.</p>
+     */
+    AUTO = int(css::sheet::GeneralFunction_AUTO),
+
+    /** sum of all numerical values is calculated.
+     */
+    SUM = int(css::sheet::GeneralFunction_SUM),
+
+    /** all values, including non-numerical values, are counted.
+     */
+    COUNT = int(css::sheet::GeneralFunction_COUNT),
+
+    /** average of all numerical values is calculated.
+     */
+    AVERAGE = int(css::sheet::GeneralFunction_AVERAGE),
+
+    /** maximum value of all numerical values is calculated.
+     */
+    MAX = int(css::sheet::GeneralFunction_MAX),
+
+    /** minimum value of all numerical values is calculated.
+     */
+    MIN = int(css::sheet::GeneralFunction_MIN),
+
+    /** product of all numerical values is calculated.
+     */
+    PRODUCT = int(css::sheet::GeneralFunction_PRODUCT),
+
+    /** numerical values are counted.
+     */
+    COUNTNUMS = int(css::sheet::GeneralFunction_COUNTNUMS),
+
+    /** standard deviation is calculated based on a sample.
+     */
+    STDEV = int(css::sheet::GeneralFunction_STDEV),
+
+    /** standard deviation is calculated based on the entire population.
+     */
+    STDEVP = int(css::sheet::GeneralFunction_STDEVP),
+
+    /** variance is calculated based on a sample.
+     */
+    VAR = int(css::sheet::GeneralFunction_VAR),
+
+    /** variance is calculated based on the entire population.
+     */
+    VARP = int(css::sheet::GeneralFunction_VARP),
+
+    /**
+    *   median of all numerical values is calculated.
+    *   @since LibreOffice 5.3
+    */
+    MEDIAN = css::sheet::GeneralFunction2::MEDIAN
+};