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90 lines
1.7 KiB
90 lines
1.7 KiB
// Boost.Units - A C++ library for zero-overhead dimensional analysis and |
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// unit/quantity manipulation and conversion |
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// |
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// Copyright (C) 2003-2008 Matthias Christian Schabel |
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// Copyright (C) 2008 Steven Watanabe |
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// |
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// Distributed under the Boost Software License, Version 1.0. (See |
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// accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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#ifndef BOOST_UNITS_DIM_IMPL_HPP |
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#define BOOST_UNITS_DIM_IMPL_HPP |
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#include <boost/mpl/bool.hpp> |
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#include <boost/mpl/less.hpp> |
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#include <boost/units/units_fwd.hpp> |
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/// \file |
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/// \brief Class encapsulating a dimension tag/value pair |
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namespace boost { |
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namespace units { |
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namespace detail { |
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struct dim_tag; |
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} |
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} |
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namespace mpl { |
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/// Less than comparison for sorting @c dim. |
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template<> |
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struct less_impl<boost::units::detail::dim_tag, boost::units::detail::dim_tag> |
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{ |
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template<class T0, class T1> |
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struct apply : mpl::less<typename T0::tag_type, typename T1::tag_type> {}; |
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}; |
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} |
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namespace units { |
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template<class Tag, class Exponent> |
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struct dim; |
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template<long N, long D> |
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class static_rational; |
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namespace detail { |
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/// Extract @c tag_type from a @c dim. |
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template<typename T> |
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struct get_tag |
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{ |
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typedef typename T::tag_type type; |
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}; |
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/// Extract @c value_type from a @c dim. |
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template<typename T> |
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struct get_value |
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{ |
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typedef typename T::value_type type; |
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}; |
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/// Determine if a @c dim is empty (has a zero exponent). |
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template<class T> |
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struct is_empty_dim; |
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template<typename T> |
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struct is_empty_dim< dim<T, static_rational<0, 1> > > : |
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mpl::true_ |
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{ }; |
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template<typename T, typename V> |
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struct is_empty_dim< dim<T, V> > : |
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mpl::false_ |
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{ }; |
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} // namespace detail |
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} // namespace units |
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} // namespace boost |
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#endif // BOOST_UNITS_DIM_IMPL_HPP
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