110 lines
2.7 KiB
Plaintext
110 lines
2.7 KiB
Plaintext
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// 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_DETAIL_SORT_HPP
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#define BOOST_UNITS_DETAIL_SORT_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/push_front.hpp>
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#include <boost/mpl/less.hpp>
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#include <boost/units/dimensionless_type.hpp>
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#include <boost/units/detail/dimension_list.hpp>
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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_insert;
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template<bool is_greater>
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struct insertion_sort_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_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_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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// prepend the current element
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template<>
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struct insertion_sort_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 list<T, Begin> type;
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};
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};
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template<int N>
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struct insertion_sort_insert {
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template<class Begin, class T>
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struct apply {
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typedef typename insertion_sort_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_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_impl {
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template<class Begin>
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struct apply {
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typedef typename insertion_sort_impl<N - 1>::template apply<typename Begin::next>::type next;
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typedef typename insertion_sort_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_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 insertion_sort
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{
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typedef typename insertion_sort_impl<T::size::value>::template apply<T>::type type;
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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
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