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diff --git a/include/2geom/symbolic/unity-builder.h b/include/2geom/symbolic/unity-builder.h
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+/*
+ * Routines to make up "zero" and "one" elements of a ring
+ *
+ * Authors:
+ *      Marco Cecchetti <mrcekets at gmail.com>
+ *
+ * Copyright 2008  authors
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it either under the terms of the GNU Lesser General Public
+ * License version 2.1 as published by the Free Software Foundation
+ * (the "LGPL") or, at your option, under the terms of the Mozilla
+ * Public License Version 1.1 (the "MPL"). If you do not alter this
+ * notice, a recipient may use your version of this file under either
+ * the MPL or the LGPL.
+ *
+ * You should have received a copy of the LGPL along with this library
+ * in the file COPYING-LGPL-2.1; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * You should have received a copy of the MPL along with this library
+ * in the file COPYING-MPL-1.1
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (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.mozilla.org/MPL/
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
+ * OF ANY KIND, either express or implied. See the LGPL or the MPL for
+ * the specific language governing rights and limitations.
+ */
+
+#ifndef _GEOM_SL_UNITY_BUILDER_H_
+#define _GEOM_SL_UNITY_BUILDER_H_
+
+
+#include <type_traits>
+
+
+
+namespace Geom { namespace SL {
+
+
+/*
+ *  zero builder function class type
+ *
+ *  made up a zero element, in the algebraic ring theory meaning,
+ *  for the type T
+ */
+
+template< typename T, bool numeric = std::is_arithmetic<T>::value >
+struct zero
+{};
+
+// specialization for basic numeric type
+template< typename T >
+struct zero<T, true>
+{
+    T operator() () const
+    {
+        return 0;
+    }
+};
+
+
+/*
+ *  one builder function class type
+ *
+ *  made up a one element, in the algebraic ring theory meaning,
+ *  for the type T
+ */
+
+template< typename T, bool numeric = std::is_arithmetic<T>::value >
+struct one
+{};
+
+// specialization for basic numeric type
+template< typename T >
+struct one<T, true>
+{
+    T operator() ()
+    {
+        return 1;
+    }
+};
+
+} /*end namespace Geom*/  } /*end namespace SL*/
+
+
+#endif // _GEOM_SL_UNITY_BUILDER_H_
+
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :