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+// Boost.Units - A C++ library for zero-overhead dimensional analysis and
+// unit/quantity manipulation and conversion
+//
+// Copyright (C) 2003-2008 Matthias Christian Schabel
+// Copyright (C) 2007-2008 Steven Watanabe
+//
+// Distributed under 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_UNITS_DETAIL_ORDINAL_HPP_INCLUDED
+#define BOOST_UNITS_DETAIL_ORDINAL_HPP_INCLUDED
+
+#include <boost/mpl/less.hpp>
+#include <boost/mpl/bool.hpp>
+
+namespace boost {
+namespace units {
+
+namespace detail {
+
+struct ordinal_tag {};
+
+}
+
+template<int N>
+struct ordinal {
+ typedef detail::ordinal_tag tag;
+ static const long value = N;
+};
+
+template<int N>
+const long ordinal<N>::value;
+
+}
+
+namespace mpl {
+
+template<>
+struct less_impl<units::detail::ordinal_tag, units::detail::ordinal_tag> {
+ template<class T1, class T2>
+ struct apply : bool_<(T1::value) < (T2::value)> {};
+};
+
+}
+
+}
+
+#endif