348 lines
8.8 KiB
Plaintext
348 lines
8.8 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) 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_DIMENSION_IMPL_HPP
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#define BOOST_UNITS_DIMENSION_IMPL_HPP
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#include <boost/mpl/begin_end.hpp>
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#include <boost/mpl/deref.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/list.hpp>
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#include <boost/mpl/next.hpp>
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#include <boost/mpl/size.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/dimensionless_type.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/push_front_if.hpp>
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#include <boost/units/detail/push_front_or_add.hpp>
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/// \file
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/// \brief Core class and metaprogramming utilities for compile-time dimensional analysis.
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namespace boost {
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namespace units {
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namespace detail {
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template<int N>
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struct insertion_sort_dims_insert;
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template<bool is_greater>
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struct insertion_sort_dims_comparison_impl;
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// have to recursively add the element to the next sequence.
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template<>
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struct insertion_sort_dims_comparison_impl<true> {
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template<class Begin, int N, class T>
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struct apply {
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typedef list<
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typename Begin::item,
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typename insertion_sort_dims_insert<N - 1>::template apply<
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typename Begin::next,
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T
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>::type
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> type;
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};
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};
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// either prepend the current element or join it to
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// the first remaining element of the sequence.
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template<>
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struct insertion_sort_dims_comparison_impl<false> {
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template<class Begin, int N, class T>
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struct apply {
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typedef typename push_front_or_add<Begin, T>::type type;
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};
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};
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template<int N>
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struct insertion_sort_dims_insert {
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template<class Begin, class T>
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struct apply {
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typedef typename insertion_sort_dims_comparison_impl<mpl::less<typename Begin::item, T>::value>::template apply<
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Begin,
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N,
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T
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>::type type;
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};
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};
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template<>
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struct insertion_sort_dims_insert<0> {
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template<class Begin, class T>
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struct apply {
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typedef list<T, dimensionless_type> type;
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};
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};
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template<int N>
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struct insertion_sort_dims_mpl_sequence {
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template<class Begin>
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struct apply {
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typedef typename insertion_sort_dims_mpl_sequence<N - 1>::template apply<typename mpl::next<Begin>::type>::type next;
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typedef typename insertion_sort_dims_insert<(next::size::value)>::template apply<next, typename mpl::deref<Begin>::type>::type type;
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};
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};
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template<>
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struct insertion_sort_dims_mpl_sequence<0> {
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template<class Begin>
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struct apply {
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typedef dimensionless_type type;
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};
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};
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template<int N>
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struct insertion_sort_dims_impl {
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template<class Begin>
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struct apply {
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typedef typename insertion_sort_dims_impl<N - 1>::template apply<typename Begin::next>::type next;
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typedef typename insertion_sort_dims_insert<(next::size::value)>::template apply<next, typename Begin::item>::type type;
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};
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};
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template<>
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struct insertion_sort_dims_impl<0> {
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template<class Begin>
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struct apply {
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typedef dimensionless_type type;
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};
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};
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template<class T>
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struct sort_dims
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{
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typedef typename insertion_sort_dims_mpl_sequence<mpl::size<T>::value>::template apply<typename mpl::begin<T>::type>::type type;
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};
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template<class T, class Next>
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struct sort_dims<list<T, Next> >
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{
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typedef typename insertion_sort_dims_impl<list<T, Next>::size::value>::template apply<list<T, Next> >::type type;
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};
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/// sorted sequences can be merged in linear time
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template<bool less, bool greater>
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struct merge_dimensions_func;
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template<int N1, int N2>
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struct merge_dimensions_impl;
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template<>
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struct merge_dimensions_func<true, false>
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{
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template<typename Begin1, typename Begin2, int N1, int N2>
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struct apply
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{
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typedef list<
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typename Begin1::item,
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typename merge_dimensions_impl<N1 - 1, N2>::template apply<
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typename Begin1::next,
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Begin2
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>::type
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> type;
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};
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};
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template<>
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struct merge_dimensions_func<false, true> {
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template<typename Begin1, typename Begin2, int N1, int N2>
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struct apply
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{
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typedef list<
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typename Begin2::item,
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typename merge_dimensions_impl<N2 - 1, N1>::template apply<
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typename Begin2::next,
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Begin1
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>::type
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> type;
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};
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};
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template<>
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struct merge_dimensions_func<false, false> {
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template<typename Begin1, typename Begin2, int N1, int N2>
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struct apply
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{
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typedef typename mpl::plus<typename Begin1::item, typename Begin2::item>::type combined;
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typedef typename push_front_if<!is_empty_dim<combined>::value>::template apply<
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typename merge_dimensions_impl<N1 - 1, N2 - 1>::template apply<
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typename Begin1::next,
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typename Begin2::next
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>::type,
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combined
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>::type type;
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};
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};
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template<int N1, int N2>
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struct merge_dimensions_impl {
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template<typename Begin1, typename Begin2>
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struct apply
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{
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typedef typename Begin1::item dim1;
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typedef typename Begin2::item dim2;
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typedef typename merge_dimensions_func<(mpl::less<dim1,dim2>::value == true),
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(mpl::less<dim2,dim1>::value == true)>::template apply<
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Begin1,
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Begin2,
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N1,
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N2
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>::type type;
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};
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};
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template<typename Sequence1, typename Sequence2>
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struct merge_dimensions
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{
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typedef typename detail::merge_dimensions_impl<Sequence1::size::value,
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Sequence2::size::value>::template
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apply<
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Sequence1,
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Sequence2
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>::type type;
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};
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template<int N>
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struct iterator_to_list
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{
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template<typename Begin>
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struct apply
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{
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typedef list<
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typename Begin::item,
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typename iterator_to_list<N - 1>::template apply<
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typename Begin::next
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>::type
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> type;
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};
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};
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template<>
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struct iterator_to_list<0>
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{
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template<typename Begin>
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struct apply {
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typedef dimensionless_type type;
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};
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};
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template<int N>
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struct merge_dimensions_impl<N, 0>
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{
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template<typename Begin1, typename Begin2>
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struct apply
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{
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typedef typename iterator_to_list<N>::template apply<Begin1>::type type;
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};
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};
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template<int N>
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struct merge_dimensions_impl<0, N>
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{
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template<typename Begin1, typename Begin2>
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struct apply
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{
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typedef typename iterator_to_list<N>::template apply<Begin2>::type type;
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};
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};
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template<>
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struct merge_dimensions_impl<0, 0>
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{
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template<typename Begin1, typename Begin2>
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struct apply
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{
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typedef dimensionless_type type;
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};
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};
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template<int N>
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struct static_inverse_impl
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{
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template<typename Begin>
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struct apply {
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typedef list<
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typename mpl::negate<typename Begin::item>::type,
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typename static_inverse_impl<N - 1>::template apply<
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typename Begin::next
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>::type
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> type;
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};
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};
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template<>
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struct static_inverse_impl<0>
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{
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template<typename Begin>
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struct apply
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{
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typedef dimensionless_type type;
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};
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};
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template<int N>
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struct static_power_impl
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{
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template<typename Begin, typename Ex>
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struct apply
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{
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typedef list<
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typename mpl::times<typename Begin::item, Ex>::type,
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typename detail::static_power_impl<N - 1>::template apply<typename Begin::next, Ex>::type
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> type;
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};
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};
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template<>
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struct static_power_impl<0>
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{
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template<typename Begin, typename Ex>
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struct apply
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{
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typedef dimensionless_type type;
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};
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};
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template<int N>
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struct static_root_impl {
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template<class Begin, class Ex>
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struct apply {
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typedef list<
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typename mpl::divides<typename Begin::item, Ex>::type,
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typename detail::static_root_impl<N - 1>::template apply<typename Begin::next, Ex>::type
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> type;
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};
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};
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template<>
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struct static_root_impl<0> {
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template<class Begin, class Ex>
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struct apply
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{
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typedef dimensionless_type type;
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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_DIMENSION_IMPL_HPP
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