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diff --git a/chart2/source/inc/CommonFunctors.hxx b/chart2/source/inc/CommonFunctors.hxx
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+++ b/chart2/source/inc/CommonFunctors.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_CHART2_SOURCE_INC_COMMONFUNCTORS_HXX
+#define INCLUDED_CHART2_SOURCE_INC_COMMONFUNCTORS_HXX
+
+#include <o3tl/any.hxx>
+#include <rtl/math.hxx>
+#include <com/sun/star/uno/Any.hxx>
+#include <rtl/ustring.hxx>
+#include "charttoolsdllapi.hxx"
+
+namespace chart
+{
+namespace CommonFunctors
+{
+
+/** unary function to convert any type T into a css::uno::Any.
+
+    <p>uno::makeAny is an inline function.  Thus is cannot be taken directly
+    (via mem_fun_ptr)</p>
+*/
+template< typename T >
+    struct makeAny
+{
+    css::uno::Any operator() ( const T & aVal )
+    {
+        return css::uno::makeAny( aVal );
+    }
+};
+
+/** unary function to convert css::uno::Any into a double number.
+
+    <p>In case no number can be generated from the Any, NaN (see
+    rtl::math::SetNAN()) is returned.</p>
+*/
+struct OOO_DLLPUBLIC_CHARTTOOLS AnyToDouble
+{
+    double operator() ( const css::uno::Any & rAny )
+    {
+        double fResult;
+        ::rtl::math::setNan( & fResult );
+        rAny >>= fResult;
+        return fResult;
+    }
+};
+
+/** unary function to convert css::uno::Any into an
+    OUString.
+*/
+struct OOO_DLLPUBLIC_CHARTTOOLS AnyToString
+{
+    OUString operator() ( const css::uno::Any & rAny )
+    {
+        if( auto pDouble = o3tl::tryAccess<double>(rAny) )
+        {
+            if( std::isnan(*pDouble) )
+                return OUString();
+            return ::rtl::math::doubleToUString(
+                * pDouble,
+                rtl_math_StringFormat_Automatic,
+                rtl_math_DecimalPlaces_Max, // use maximum decimal places available
+                '.', // decimal separator
+                true // remove trailing zeros
+                );
+        }
+        else if( auto s = o3tl::tryAccess<OUString>(rAny) )
+        {
+            return *s;
+        }
+
+        return OUString();
+    }
+};
+
+/** unary function to convert an OUString into a double number.
+
+    <p>For conversion rtl::math::StringToDouble is used.</p>
+ */
+struct OOO_DLLPUBLIC_CHARTTOOLS OUStringToDouble
+{
+    double operator() ( const OUString & rStr )
+    {
+        rtl_math_ConversionStatus eConversionStatus;
+        double fResult = ::rtl::math::stringToDouble( rStr, '.', ',', & eConversionStatus );
+
+        if( eConversionStatus != rtl_math_ConversionStatus_Ok )
+            ::rtl::math::setNan( & fResult );
+
+        return fResult;
+    }
+};
+
+/** unary function to convert a double number into an OUString.
+
+    <p>For conversion rtl::math::DoubleToOUString is used.</p>
+ */
+struct OOO_DLLPUBLIC_CHARTTOOLS DoubleToOUString
+{
+    OUString operator() ( double fNumber )
+    {
+        return ::rtl::math::doubleToUString(
+            fNumber,
+            rtl_math_StringFormat_Automatic,
+            rtl_math_DecimalPlaces_Max, // use maximum decimal places available
+            '.',
+            true
+            );
+    }
+};
+
+} //  namespace CommonFunctors
+} //  namespace chart
+
+// INCLUDED_CHART2_SOURCE_INC_COMMONFUNCTORS_HXX
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */