Incomplete work for using Boost.Polygon to compute medial axis

xs/src/boost/range/detail/misc_concept.hpp

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+// Boost.Range library concept checks
+//
+//  Copyright Neil Groves 2009. Use, modification and distribution
+//  are subject to the Boost Software License, Version 1.0. (See
+//  accompanying file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt)
+//
+#ifndef BOOST_RANGE_DETAIL_MISC_CONCEPT_HPP_INCLUDED
+#define BOOST_RANGE_DETAIL_MISC_CONCEPT_HPP_INCLUDED
+
+#include <boost/concept_check.hpp>
+
+namespace boost
+{
+    namespace range_detail
+    {
+        template<typename T1, typename T2>
+        class SameTypeConcept
+        {
+        public:
+            BOOST_CONCEPT_USAGE(SameTypeConcept)
+            {
+                same_type(a,b);
+            }
+        private:
+            template<typename T> void same_type(T,T) {}
+            T1 a;
+            T2 b;
+        };
+    }
+}
+
+#endif // include guard