168 lines
4.8 KiB
Plaintext
168 lines
4.8 KiB
Plaintext
// 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) 2007-2008 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_HPP
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#define BOOST_UNITS_DIM_HPP
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#include <boost/static_assert.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/mpl/arithmetic.hpp>
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#include <boost/units/config.hpp>
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#include <boost/units/static_rational.hpp>
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#include <boost/units/detail/dim_impl.hpp>
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/// \file dim.hpp
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/// \brief Handling of fundamental dimension/exponent pairs.
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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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/// \brief Dimension tag/exponent pair for a single fundamental dimension.
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///
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/// \details
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/// The dim class represents a single dimension tag/dimension exponent pair.
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/// That is, @c dim<tag_type,value_type> is a pair where @c tag_type represents the
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/// fundamental dimension being represented and @c value_type represents the
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/// exponent of that fundamental dimension as a @c static_rational. @c tag_type must
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/// be a derived from a specialization of @c base_dimension.
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/// Specialization of the following Boost.MPL metafunctions are provided
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///
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/// - @c mpl::plus for two @c dims
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/// - @c mpl::minus for two @c dims
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/// - @c mpl::negate for a @c dim
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///
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/// These metafunctions all operate on the exponent, and require
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/// that the @c dim operands have the same base dimension tag.
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/// In addition, multiplication and division by @c static_rational
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/// is supported.
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///
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/// - @c mpl::times for a @c static_rational and a @c dim in either order
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/// - @c mpl::divides for a @c static_rational and a @c dim in either order
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///
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/// These metafunctions likewise operate on the exponent only.
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template<typename T,typename V>
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struct dim
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{
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typedef dim type;
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typedef detail::dim_tag tag;
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typedef T tag_type;
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typedef V value_type;
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};
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} // namespace units
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} // namespace boost
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#if BOOST_UNITS_HAS_BOOST_TYPEOF
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#include BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP()
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BOOST_TYPEOF_REGISTER_TEMPLATE(boost::units::dim, 2)
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#endif
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#ifndef BOOST_UNITS_DOXYGEN
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namespace boost {
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namespace mpl {
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// define MPL operators acting on dim<T,V>
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template<>
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struct plus_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
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{
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BOOST_STATIC_ASSERT((boost::is_same<typename T0::tag_type,typename T1::tag_type>::value == true));
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typedef boost::units::dim<typename T0::tag_type, typename mpl::plus<typename T0::value_type, typename T1::value_type>::type> type;
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};
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};
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template<>
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struct minus_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
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{
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BOOST_STATIC_ASSERT((boost::is_same<typename T0::tag_type,typename T1::tag_type>::value == true));
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typedef boost::units::dim<typename T0::tag_type, typename mpl::minus<typename T0::value_type, typename T1::value_type>::type> type;
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};
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};
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template<>
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struct times_impl<boost::units::detail::dim_tag,boost::units::detail::static_rational_tag>
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{
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template<class T0, class T1>
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struct apply
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{
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typedef boost::units::dim<typename T0::tag_type, typename mpl::times<typename T0::value_type, T1>::type> type;
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};
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};
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template<>
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struct times_impl<boost::units::detail::static_rational_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
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{
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typedef boost::units::dim<typename T1::tag_type, typename mpl::times<T0, typename T1::value_type>::type> type;
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};
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};
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template<>
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struct divides_impl<boost::units::detail::dim_tag,boost::units::detail::static_rational_tag>
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{
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template<class T0, class T1>
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struct apply
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{
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typedef boost::units::dim<typename T0::tag_type, typename mpl::divides<typename T0::value_type, T1>::type> type;
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};
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};
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template<>
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struct divides_impl<boost::units::detail::static_rational_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
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{
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typedef boost::units::dim<typename T1::tag_type, typename mpl::divides<T0, typename T1::value_type>::type> type;
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};
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};
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template<>
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struct negate_impl<boost::units::detail::dim_tag>
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{
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template<class T0>
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struct apply
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{
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typedef boost::units::dim<typename T0::tag_type,typename mpl::negate<typename T0::value_type>::type> type;
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};
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};
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} // namespace mpl
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} // namespace boost
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#endif
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#endif // BOOST_UNITS_DIM_HPP
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