mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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100 lines
4.2 KiB
C++
100 lines
4.2 KiB
C++
#ifndef SPROUT_ALGORITHM_FIXED_NEXT_PERMUTATION_HPP
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#define SPROUT_ALGORITHM_FIXED_NEXT_PERMUTATION_HPP
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#include <sprout/config.hpp>
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#include <sprout/container/traits.hpp>
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#include <sprout/container/functions.hpp>
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#include <sprout/iterator/operation.hpp>
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#include <sprout/algorithm/fixed/result_of.hpp>
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#include <sprout/algorithm/fixed/swap_element.hpp>
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#include <sprout/algorithm/fixed/reverse.hpp>
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#include <sprout/sub_array.hpp>
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#include <sprout/utility/pair.hpp>
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#include HDR_FUNCTIONAL_SSCRISK_CEL_OR_SPROUT
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#include HDR_ITERATOR_SSCRISK_CEL_OR_SPROUT
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namespace sprout {
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namespace fixed {
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namespace detail {
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template<typename Result, typename Container, typename Difference>
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inline SPROUT_CONSTEXPR Result
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next_permutation_impl_4(Container const& cont, Difference d) {
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return Result(
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sprout::get_internal(sprout::fixed::reverse(sprout::sub_array<Container const&>(cont, d, sprout::size(cont)))),
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true
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);
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}
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template<typename Result, typename Container, typename Compare, typename Iterator>
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inline SPROUT_CONSTEXPR Result
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next_permutation_impl_3(Container const& cont, Compare comp, Iterator first, Iterator last, Iterator i, Iterator ii, Iterator j) {
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return !comp(*i, *sprout::prev(j)) ? sprout::fixed::detail::next_permutation_impl_3<Result>(
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cont, comp, first, last,
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i, ii, sprout::prev(j)
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)
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: sprout::fixed::detail::next_permutation_impl_4<Result>(
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sprout::fixed::swap_element(cont, i, sprout::prev(j)),
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NS_SSCRISK_CEL_OR_SPROUT::distance(first, ii)
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)
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;
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}
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template<typename Result, typename Container, typename Compare, typename Iterator>
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inline SPROUT_CONSTEXPR Result
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next_permutation_impl_2(Container const& cont, Compare comp, Iterator first, Iterator last, Iterator i, Iterator ii) {
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return comp(*i, *ii) ? sprout::fixed::detail::next_permutation_impl_3<Result>(
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cont, comp, first, last,
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i, ii, last
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)
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: i == first ? Result(sprout::fixed::reverse_copy(first, last, cont), false)
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: sprout::fixed::detail::next_permutation_impl_2<Result>(
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cont, comp, first, last,
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sprout::prev(i), i
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)
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;
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}
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template<typename Result, typename Container, typename Compare, typename Iterator>
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inline SPROUT_CONSTEXPR Result
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next_permutation_impl_1(Container const& cont, Compare comp, Iterator first, Iterator last, Iterator i) {
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return i == last ? Result(sprout::deep_copy(cont), false)
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: sprout::fixed::detail::next_permutation_impl_2<Result>(
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cont, comp, first, last,
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sprout::prev(last, 2), sprout::prev(last)
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)
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;
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}
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template<typename Result, typename Container, typename Compare, typename Iterator>
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inline SPROUT_CONSTEXPR Result
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next_permutation_impl(Container const& cont, Compare comp, Iterator first, Iterator last) {
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return first == last ? Result(sprout::deep_copy(cont), false)
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: sprout::fixed::detail::next_permutation_impl_1<Result>(
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cont, comp, first, last,
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sprout::next(first)
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);
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}
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} // namespace detail
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//
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// next_permutation
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//
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template<typename Container, typename Compare>
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inline SPROUT_CONSTEXPR sprout::pair<typename sprout::fixed::result_of::algorithm<Container>::type, bool>
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next_permutation(Container const& cont, Compare comp) {
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typedef sprout::pair<typename sprout::fixed::result_of::algorithm<Container>::type, bool> type;
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return sprout::fixed::detail::next_permutation_impl<type>(
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cont, comp,
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sprout::begin(cont), sprout::end(cont)
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);
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}
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template<typename Container>
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inline SPROUT_CONSTEXPR sprout::pair<typename sprout::fixed::result_of::algorithm<Container>::type, bool>
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next_permutation(Container const& cont) {
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typedef sprout::pair<typename sprout::fixed::result_of::algorithm<Container>::type, bool> type;
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return sprout::fixed::detail::next_permutation_impl<type>(
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cont, NS_SSCRISK_CEL_OR_SPROUT::less<typename sprout::container_traits<Container>::value_type>(),
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sprout::begin(cont), sprout::end(cont)
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);
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}
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} // namespace fixed
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using sprout::fixed::next_permutation;
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} // namespace sprout
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#endif // #ifndef SPROUT_ALGORITHM_FIXED_NEXT_PERMUTATION_HPP
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