459 lines
15 KiB
C++
459 lines
15 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_CONVERSION_IMPL_HPP
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#define BOOST_UNITS_DETAIL_CONVERSION_IMPL_HPP
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#include <boost/mpl/bool.hpp>
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#include <boost/mpl/and.hpp>
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#include <boost/mpl/divides.hpp>
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#include <boost/preprocessor/seq/enum.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/units/heterogeneous_system.hpp>
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#include <boost/units/homogeneous_system.hpp>
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#include <boost/units/reduce_unit.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/dimension_list.hpp>
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#include <boost/units/detail/heterogeneous_conversion.hpp>
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#include <boost/units/detail/one.hpp>
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#include <boost/units/detail/static_rational_power.hpp>
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#include <boost/units/detail/unscale.hpp>
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#include <boost/units/units_fwd.hpp>
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namespace boost {
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namespace units {
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namespace detail {
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template<class Source, class Dest>
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struct conversion_factor_helper;
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template<class Source, class Dest>
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struct call_base_unit_converter;
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}
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/// INTERNAL ONLY
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struct undefined_base_unit_converter_base {
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static const bool is_defined = false;
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};
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/// INTERNAL ONLY
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struct no_default_conversion {
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static const bool is_defined = false;
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};
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/// INTERNAL ONLY
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template<class BaseUnit>
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struct unscaled_get_default_conversion : no_default_conversion { };
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/// INTERNAL ONLY
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template<bool is_defined>
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struct unscaled_get_default_conversion_impl;
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/// INTERNAL ONLY
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template<>
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struct unscaled_get_default_conversion_impl<true>
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{
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template<class T>
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struct apply
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{
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typedef typename unscaled_get_default_conversion<typename unscale<T>::type>::type 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 unscaled_get_default_conversion_impl<false>
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{
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template<class T>
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struct apply
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{
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typedef typename T::unit_type type;
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};
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};
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/// INTERNAL ONLY
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template<class BaseUnit>
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struct get_default_conversion
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{
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typedef typename unscaled_get_default_conversion_impl<
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unscaled_get_default_conversion<typename unscale<BaseUnit>::type>::is_defined
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>::template apply<BaseUnit>::type type;
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};
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/// INTERNAL ONLY
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template<class Source, class Destination>
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struct select_base_unit_converter
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{
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typedef Source source_type;
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typedef Destination destination_type;
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};
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/// INTERNAL ONLY
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template<class Source, class Dest>
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struct base_unit_converter_base : undefined_base_unit_converter_base {
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};
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/// INTERNAL ONLY
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template<class Source>
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struct base_unit_converter_base<Source, BOOST_UNITS_MAKE_HETEROGENEOUS_UNIT(Source, typename Source::dimension_type)>
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{
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static const bool is_defined = true;
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typedef one type;
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static type value() {
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one result;
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return(result);
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}
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};
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/// INTERNAL ONLY
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template<class Source, class Dest>
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struct base_unit_converter : base_unit_converter_base<Source, Dest> { };
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namespace detail {
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template<class Source, class Dest>
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struct do_call_base_unit_converter {
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typedef select_base_unit_converter<typename unscale<Source>::type, typename unscale<Dest>::type> selector;
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typedef typename selector::source_type source_type;
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typedef typename selector::destination_type destination_type;
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typedef base_unit_converter<source_type, destination_type> converter;
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typedef typename mpl::divides<typename get_scale_list<Source>::type, typename get_scale_list<source_type>::type>::type source_factor;
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typedef typename mpl::divides<typename get_scale_list<Dest>::type, typename get_scale_list<destination_type>::type>::type destination_factor;
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typedef typename mpl::divides<source_factor, destination_factor>::type factor;
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typedef eval_scale_list<factor> eval_factor;
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typedef typename multiply_typeof_helper<typename converter::type, typename eval_factor::type>::type type;
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static type value()
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{
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return(converter::value() * eval_factor::value());
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}
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};
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template<bool forward_is_defined, bool reverse_is_defined>
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struct call_base_unit_converter_base_unit_impl;
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template<>
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struct call_base_unit_converter_base_unit_impl<true, true>
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{
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template<class Source, class Dest>
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struct apply
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: do_call_base_unit_converter<Source, typename Dest::unit_type>
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{
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};
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};
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template<>
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struct call_base_unit_converter_base_unit_impl<true, false>
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{
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template<class Source, class Dest>
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struct apply
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: do_call_base_unit_converter<Source, typename Dest::unit_type>
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{
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};
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};
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template<>
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struct call_base_unit_converter_base_unit_impl<false, true>
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{
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template<class Source, class Dest>
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struct apply
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{
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typedef do_call_base_unit_converter<Dest, typename Source::unit_type> converter;
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typedef typename divide_typeof_helper<one, typename converter::type>::type type;
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static type value() {
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one numerator;
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return(numerator / converter::value());
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}
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};
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};
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template<>
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struct call_base_unit_converter_base_unit_impl<false, false>
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{
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template<class Source, class Dest>
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struct apply
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{
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typedef typename reduce_unit<typename get_default_conversion<Source>::type>::type new_source;
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typedef typename reduce_unit<typename get_default_conversion<Dest>::type>::type new_dest;
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typedef call_base_unit_converter<Source, new_source> start;
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typedef detail::conversion_factor_helper<
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new_source,
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new_dest
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> conversion;
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typedef call_base_unit_converter<Dest, new_dest> end;
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typedef typename divide_typeof_helper<
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typename multiply_typeof_helper<
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typename start::type,
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typename conversion::type
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>::type,
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typename end::type
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>::type type;
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static type value() {
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return(start::value() * conversion::value() / end::value());
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}
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};
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};
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template<int N>
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struct get_default_conversion_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 Begin::item source_pair;
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typedef typename source_pair::value_type exponent;
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typedef typename source_pair::tag_type source;
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typedef typename reduce_unit<typename get_default_conversion<source>::type>::type new_source;
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typedef typename get_default_conversion_impl<N-1>::template apply<typename Begin::next> next_iteration;
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typedef typename multiply_typeof_helper<typename power_typeof_helper<new_source, exponent>::type, typename next_iteration::unit_type>::type unit_type;
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typedef call_base_unit_converter<source, new_source> conversion;
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typedef typename multiply_typeof_helper<typename conversion::type, typename next_iteration::type>::type type;
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static type value() {
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return(static_rational_power<exponent>(conversion::value()) * next_iteration::value());
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}
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};
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};
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template<>
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struct get_default_conversion_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 unit<dimensionless_type, heterogeneous_system<heterogeneous_system_impl<dimensionless_type, dimensionless_type, no_scale> > > unit_type;
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typedef one type;
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static one value() {
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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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template<bool is_defined>
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struct call_base_unit_converter_impl;
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template<>
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struct call_base_unit_converter_impl<true>
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{
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template<class Source, class Dest>
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struct apply
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: do_call_base_unit_converter<Source, Dest>
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{
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};
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};
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template<>
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struct call_base_unit_converter_impl<false>
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{
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template<class Source, class Dest>
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struct apply {
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typedef typename reduce_unit<typename get_default_conversion<Source>::type>::type new_source;
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typedef typename Dest::system_type::type system_list;
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typedef typename get_default_conversion_impl<system_list::size::value>::template apply<system_list> impl;
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typedef typename impl::unit_type new_dest;
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typedef call_base_unit_converter<Source, new_source> start;
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typedef conversion_factor_helper<new_source, new_dest> conversion;
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typedef typename divide_typeof_helper<
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typename multiply_typeof_helper<
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typename start::type,
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typename conversion::type
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>::type,
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typename impl::type
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>::type type;
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static type value() {
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return(start::value() * conversion::value() / impl::value());
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}
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};
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};
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#define BOOST_UNITS_DETAIL_BASE_UNIT_CONVERTER_IS_DEFINED(Source, Dest)\
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base_unit_converter<\
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typename select_base_unit_converter<typename unscale<Source>::type, typename unscale<Dest>::type>::source_type,\
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typename select_base_unit_converter<typename unscale<Source>::type, typename unscale<Dest>::type>::destination_type\
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>::is_defined
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template<class Source, class Dest>
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struct call_base_unit_converter : call_base_unit_converter_impl<BOOST_UNITS_DETAIL_BASE_UNIT_CONVERTER_IS_DEFINED(Source, Dest)>::template apply<Source, Dest>
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{
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};
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template<class Source, class Dest>
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struct call_base_unit_converter<Source, BOOST_UNITS_MAKE_HETEROGENEOUS_UNIT(Dest, typename Source::dimension_type)> :
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call_base_unit_converter_base_unit_impl<
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BOOST_UNITS_DETAIL_BASE_UNIT_CONVERTER_IS_DEFINED(Source, typename Dest::unit_type),
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BOOST_UNITS_DETAIL_BASE_UNIT_CONVERTER_IS_DEFINED(Dest, typename Source::unit_type)
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>::template apply<Source, Dest>
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{
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};
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template<int N>
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struct conversion_impl
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{
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template<class Begin, class DestinationSystem>
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struct apply
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{
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typedef typename conversion_impl<N-1>::template apply<
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typename Begin::next,
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DestinationSystem
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> next_iteration;
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typedef typename Begin::item unit_pair;
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typedef typename unit_pair::tag_type unit;
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typedef typename unit::dimension_type dimensions;
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typedef typename reduce_unit<units::unit<dimensions, DestinationSystem> >::type reduced_unit;
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typedef detail::call_base_unit_converter<unit, reduced_unit> converter;
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typedef typename multiply_typeof_helper<typename converter::type, typename next_iteration::type>::type type;
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static type value() { return(static_rational_power<typename unit_pair::value_type>(converter::value()) * next_iteration::value()); }
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};
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};
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template<>
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struct conversion_impl<0>
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{
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template<class Begin, class DestinationSystem>
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struct apply
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{
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typedef one type;
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static type value() { one result; return(result); }
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};
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};
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} // namespace detail
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/// forward to conversion_factor (intentionally allowing ADL)
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/// INTERNAL ONLY
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template<class Unit1, class T1, class Unit2, class T2>
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struct conversion_helper<quantity<Unit1, T1>, quantity<Unit2, T2> >
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{
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/// INTERNAL ONLY
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typedef quantity<Unit2, T2> destination_type;
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static destination_type convert(const quantity<Unit1, T1>& source)
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{
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Unit1 u1;
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Unit2 u2;
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return(destination_type::from_value(static_cast<T2>(source.value() * conversion_factor(u1, u2))));
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}
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};
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namespace detail {
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template<class Source, class Dest>
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struct conversion_factor_helper;
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template<class D, class L1, class L2>
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struct conversion_factor_helper<unit<D, homogeneous_system<L1> >, unit<D, homogeneous_system<L2> > >
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: conversion_factor_helper<
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typename reduce_unit<unit<D, homogeneous_system<L1> > >::type,
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typename reduce_unit<unit<D, homogeneous_system<L2> > >::type
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>
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{
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//typedef typename reduce_unit<unit<D, homogeneous_system<L1> > >::type source_unit;
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//typedef typename source_unit::system_type::type unit_list;
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//typedef typename detail::conversion_impl<unit_list::size::value>::template apply<
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// unit_list,
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// homogeneous_system<L2>
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//> impl;
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//typedef typename impl::type type;
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//static type value()
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//{
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// return(impl::value());
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//}
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};
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template<class D, class L1, class L2>
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struct conversion_factor_helper<unit<D, heterogeneous_system<L1> >, unit<D, homogeneous_system<L2> > >
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: conversion_factor_helper<
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typename reduce_unit<unit<D, heterogeneous_system<L1> > >::type,
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typename reduce_unit<unit<D, homogeneous_system<L2> > >::type
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>
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{
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//typedef typename detail::conversion_impl<L1::type::size::value>::template apply<
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// typename L1::type,
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// homogeneous_system<L2>
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//> impl;
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//typedef eval_scale_list<typename L1::scale> scale;
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//typedef typename multiply_typeof_helper<typename impl::type, typename scale::type>::type type;
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//static type value()
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//{
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// return(impl::value() * scale::value());
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//}
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};
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// There is no simple algorithm for doing this conversion
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// other than just defining it as the reverse of the
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// heterogeneous->homogeneous case
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template<class D, class L1, class L2>
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struct conversion_factor_helper<unit<D, homogeneous_system<L1> >, unit<D, heterogeneous_system<L2> > >
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: conversion_factor_helper<
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typename reduce_unit<unit<D, homogeneous_system<L1> > >::type,
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typename reduce_unit<unit<D, heterogeneous_system<L2> > >::type
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>
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{
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//typedef typename detail::conversion_impl<L2::type::size::value>::template apply<
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// typename L2::type,
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// homogeneous_system<L1>
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//> impl;
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//typedef eval_scale_list<typename L2::scale> scale;
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//typedef typename multiply_typeof_helper<typename impl::type, typename scale::type>::type type;
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//static type value()
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//{
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// one numerator;
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// return(numerator / (impl::value() * scale::value()));
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//}
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};
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/// Requires that all possible conversions
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/// between base units are defined.
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template<class D, class S1, class S2>
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struct conversion_factor_helper<unit<D, heterogeneous_system<S1> >, unit<D, heterogeneous_system<S2> > >
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{
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/// INTERNAL ONLY
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typedef typename detail::extract_base_units<S1::type::size::value>::template apply<
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typename S1::type,
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dimensionless_type
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>::type from_base_units;
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/// INTERNAL ONLY
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typedef typename detail::extract_base_units<S2::type::size::value>::template apply<
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typename S2::type,
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from_base_units
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>::type all_base_units;
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/// INTERNAL ONLY
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typedef typename detail::make_homogeneous_system<all_base_units>::type system;
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typedef typename detail::conversion_impl<S1::type::size::value>::template apply<
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typename S1::type,
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system
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> conversion1;
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typedef typename detail::conversion_impl<S2::type::size::value>::template apply<
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typename S2::type,
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system
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> conversion2;
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typedef eval_scale_list<typename mpl::divides<typename S1::scale, typename S2::scale>::type> scale;
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typedef typename multiply_typeof_helper<
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typename conversion1::type,
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typename divide_typeof_helper<typename scale::type, typename conversion2::type>::type
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>::type type;
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static type value()
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{
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return(conversion1::value() * (scale::value() / conversion2::value()));
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}
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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_CONVERSION_IMPL_HPP
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