| 1 | // Boost.Units - A C++ library for zero-overhead dimensional analysis and |
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| 2 | // unit/quantity manipulation and conversion |
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| 3 | // |
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| 4 | // Copyright (C) 2003-2008 Matthias Christian Schabel |
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| 5 | // Copyright (C) 2007-2008 Steven Watanabe |
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| 6 | // |
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| 7 | // Distributed under the Boost Software License, Version 1.0. (See |
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| 8 | // accompanying file LICENSE_1_0.txt or copy at |
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| 9 | // http://www.boost.org/LICENSE_1_0.txt) |
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| 10 | |
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| 11 | #ifndef BOOST_UNITS_DETAIL_ORDINAL_HPP_INCLUDED |
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| 12 | #define BOOST_UNITS_DETAIL_ORDINAL_HPP_INCLUDED |
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| 13 | |
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| 14 | #include <boost/mpl/less.hpp> |
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| 15 | #include <boost/mpl/bool.hpp> |
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| 16 | |
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| 17 | namespace boost { |
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| 18 | namespace units { |
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| 19 | |
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| 20 | namespace detail { |
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| 21 | |
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| 22 | struct ordinal_tag {}; |
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| 23 | |
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| 24 | } |
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| 25 | |
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| 26 | template<int N> |
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| 27 | struct ordinal { |
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| 28 | typedef detail::ordinal_tag tag; |
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| 29 | BOOST_STATIC_CONSTEXPR long value = N; |
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| 30 | }; |
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| 31 | |
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| 32 | template<int N> |
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| 33 | BOOST_CONSTEXPR_OR_CONST long ordinal<N>::value; |
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| 34 | |
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| 35 | } |
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| 36 | |
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| 37 | namespace mpl { |
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| 38 | |
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| 39 | template<> |
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| 40 | struct less_impl<units::detail::ordinal_tag, units::detail::ordinal_tag> { |
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| 41 | template<class T1, class T2> |
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| 42 | struct apply : bool_<(T1::value) < (T2::value)> {}; |
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| 43 | }; |
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| 44 | |
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| 45 | } |
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| 46 | |
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| 47 | } |
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| 48 | |
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| 49 | #endif |
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| 50 | |
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