235 lines
5.2 KiB
C++
235 lines
5.2 KiB
C++
// 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_DETAIL_UNSCALE_HPP_INCLUDED
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#define BOOST_UNITS_DETAIL_UNSCALE_HPP_INCLUDED
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#include <string>
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#include <boost/mpl/bool.hpp>
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#include <boost/mpl/size.hpp>
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#include <boost/mpl/begin.hpp>
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#include <boost/mpl/next.hpp>
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#include <boost/mpl/deref.hpp>
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#include <boost/mpl/plus.hpp>
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#include <boost/mpl/times.hpp>
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#include <boost/mpl/negate.hpp>
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#include <boost/mpl/less.hpp>
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#include <boost/units/config.hpp>
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#include <boost/units/dimension.hpp>
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#include <boost/units/scale.hpp>
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#include <boost/units/static_rational.hpp>
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#include <boost/units/units_fwd.hpp>
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#include <boost/units/detail/one.hpp>
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namespace boost {
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namespace units {
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template<class T>
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struct heterogeneous_system;
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template<class T, class D, class Scale>
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struct heterogeneous_system_impl;
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template<class T, class E>
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struct heterogeneous_system_dim;
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template<class S, class Scale>
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struct scaled_base_unit;
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/// removes all scaling from a unit or a base unit.
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template<class T>
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struct unscale
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{
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#ifndef BOOST_UNITS_DOXYGEN
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typedef T type;
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#else
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typedef detail::unspecified type;
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#endif
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};
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/// INTERNAL ONLY
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template<class S, class Scale>
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struct unscale<scaled_base_unit<S, Scale> >
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{
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typedef typename unscale<S>::type type;
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};
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/// INTERNAL ONLY
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template<class D, class S>
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struct unscale<unit<D, S> >
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{
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typedef unit<D, typename unscale<S>::type> type;
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};
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/// INTERNAL ONLY
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template<class Scale>
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struct scale_list_dim;
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/// INTERNAL ONLY
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template<class T>
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struct get_scale_list
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{
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typedef dimensionless_type type;
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};
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/// INTERNAL ONLY
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template<class S, class Scale>
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struct get_scale_list<scaled_base_unit<S, Scale> >
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{
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typedef typename mpl::times<list<scale_list_dim<Scale>, dimensionless_type>, typename get_scale_list<S>::type>::type type;
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};
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/// INTERNAL ONLY
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template<class D, class S>
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struct get_scale_list<unit<D, S> >
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{
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typedef typename get_scale_list<S>::type type;
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};
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/// INTERNAL ONLY
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struct scale_dim_tag {};
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/// INTERNAL ONLY
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template<class Scale>
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struct scale_list_dim : Scale
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{
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typedef scale_dim_tag tag;
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typedef scale_list_dim type;
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};
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} // namespace units
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#ifndef BOOST_UNITS_DOXYGEN
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namespace mpl {
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/// INTERNAL ONLY
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template<>
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struct less_impl<boost::units::scale_dim_tag, boost::units::scale_dim_tag>
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{
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template<class T0, class T1>
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struct apply : mpl::bool_<((T0::base) < (T1::base))> {};
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};
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}
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#endif
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namespace units {
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namespace detail {
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template<class Scale>
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struct is_empty_dim<scale_list_dim<Scale> > : mpl::false_ {};
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template<long N>
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struct is_empty_dim<scale_list_dim<scale<N, static_rational<0, 1> > > > : mpl::true_ {};
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template<int N>
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struct eval_scale_list_impl
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{
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template<class Begin>
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struct apply
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{
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typedef typename eval_scale_list_impl<N-1>::template apply<typename Begin::next> next_iteration;
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typedef typename multiply_typeof_helper<typename next_iteration::type, typename Begin::item::value_type>::type type;
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static type value()
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{
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return(next_iteration::value() * Begin::item::value());
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}
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};
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};
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template<>
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struct eval_scale_list_impl<0>
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{
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template<class Begin>
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struct apply
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{
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typedef one type;
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static one value()
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{
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one result;
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return(result);
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}
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};
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};
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}
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/// INTERNAL ONLY
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template<class T>
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struct eval_scale_list : detail::eval_scale_list_impl<T::size::value>::template apply<T> {};
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} // namespace units
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#ifndef BOOST_UNITS_DOXYGEN
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namespace mpl {
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/// INTERNAL ONLY
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template<>
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struct plus_impl<boost::units::scale_dim_tag, boost::units::scale_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::scale_list_dim<
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boost::units::scale<
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(T0::base),
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typename mpl::plus<typename T0::exponent, typename T1::exponent>::type
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>
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> type;
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};
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};
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/// INTERNAL ONLY
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template<>
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struct negate_impl<boost::units::scale_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::scale_list_dim<
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boost::units::scale<
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(T0::base),
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typename mpl::negate<typename T0::exponent>::type
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>
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> type;
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};
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};
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/// INTERNAL ONLY
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template<>
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struct times_impl<boost::units::scale_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::scale_list_dim<
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boost::units::scale<
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(T0::base),
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typename mpl::times<typename T0::exponent, T1>::type
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>
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> type;
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};
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};
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} // namespace mpl
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#endif
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} // namespace boost
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#endif
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