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https://github.com/bolero-MURAKAMI/Sprout.git
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aa96f9ce73
sprout/numeric/fixed/partial_sum.hpp 修正 sprout/numeric/fixed/adjacent_difference.hpp 修正
76 lines
2 KiB
C++
76 lines
2 KiB
C++
#ifndef SPROUT_DETAIL_ITERATOR_HPP
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#define SPROUT_DETAIL_ITERATOR_HPP
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#include <iterator>
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#include <sprout/config.hpp>
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#include <sprout/iterator/operation.hpp>
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namespace sprout {
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namespace detail {
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namespace detail_ {
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template<typename Iterator>
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SPROUT_CONSTEXPR typename std::iterator_traits<Iterator>::difference_type distance(
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Iterator first,
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Iterator last
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)
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{
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return first == last
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? 0
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: 1 + sprout::detail::detail_::distance(sprout::next(first), last)
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;
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}
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template<typename Iterator>
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SPROUT_CONSTEXPR typename std::iterator_traits<Iterator>::difference_type distance_impl(
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Iterator first,
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Iterator last
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)
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{
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using sprout::detail::detail_::distance;
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return distance(first, last);
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}
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} // namespace detail_
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//
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// distance
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//
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template<typename Iterator>
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SPROUT_CONSTEXPR typename std::iterator_traits<Iterator>::difference_type distance(
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Iterator first,
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Iterator last
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)
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{
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return sprout::detail::detail_::distance_impl(first, last);
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}
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template<typename Iterator>
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SPROUT_CONSTEXPR typename std::iterator_traits<Iterator>::difference_type bidirectional_distance_impl(
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Iterator first1,
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Iterator first2,
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Iterator last,
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typename std::iterator_traits<Iterator>::difference_type current = 1
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)
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{
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return first1 == last
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? current
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: first2 == last
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? -current
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: sprout::detail::bidirectional_distance_impl(sprout::next(first1), sprout::prev(first2), last, current + 1)
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;
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}
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//
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// bidirectional_distance
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//
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template<typename Iterator>
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SPROUT_CONSTEXPR typename std::iterator_traits<Iterator>::difference_type bidirectional_distance(
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Iterator first,
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Iterator last
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)
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{
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return first == last
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? 0
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: sprout::detail::bidirectional_distance_impl(sprout::next(first), sprout::prev(first), last)
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;
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}
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} // namespace detail
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} // namespace sprout
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#endif // #ifndef SPROUT_DETAIL_ITERATOR_HPP
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