Chris@16: // Boost.Units - A C++ library for zero-overhead dimensional analysis and 
Chris@16: // unit/quantity manipulation and conversion
Chris@16: //
Chris@16: // Copyright (C) 2003-2008 Matthias Christian Schabel
Chris@16: // Copyright (C) 2007-2008 Steven Watanabe
Chris@16: //
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See
Chris@16: // accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef BOOST_UNITS_DETAIL_ORDINAL_HPP_INCLUDED
Chris@16: #define BOOST_UNITS_DETAIL_ORDINAL_HPP_INCLUDED
Chris@16: 
Chris@16: #include <boost/mpl/less.hpp>
Chris@16: #include <boost/mpl/bool.hpp>
Chris@16: 
Chris@16: namespace boost {
Chris@16: namespace units {
Chris@16: 
Chris@16: namespace detail {
Chris@16: 
Chris@16: struct ordinal_tag {};
Chris@16: 
Chris@16: }
Chris@16: 
Chris@16: template<int N>
Chris@16: struct ordinal {
Chris@16:     typedef detail::ordinal_tag tag;
Chris@16:     static const long value = N;
Chris@16: };
Chris@16: 
Chris@16: template<int N>
Chris@16: const long ordinal<N>::value;
Chris@16: 
Chris@16: }
Chris@16: 
Chris@16: namespace mpl {
Chris@16: 
Chris@16: template<>
Chris@16: struct less_impl<units::detail::ordinal_tag, units::detail::ordinal_tag> {
Chris@16:     template<class T1, class T2>
Chris@16:     struct apply : bool_<(T1::value) < (T2::value)> {};
Chris@16: };
Chris@16: 
Chris@16: }
Chris@16: 
Chris@16: }
Chris@16: 
Chris@16: #endif