mirror of
https://github.com/bolero-MURAKAMI/Sprout
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101 lines
3.5 KiB
C++
101 lines
3.5 KiB
C++
#ifndef SPROUT_ALGORITHM_ADJACENT_FIND_HPP
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#define SPROUT_ALGORITHM_ADJACENT_FIND_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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#include HDR_FUNCTIONAL_SSCRISK_CEL_OR_SPROUT
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namespace sprout {
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namespace detail {
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template<typename RandomAccessIterator>
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inline SPROUT_CONSTEXPR RandomAccessIterator
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adjacent_find_impl_ra_1(RandomAccessIterator found, RandomAccessIterator last) {
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return NS_SSCRISK_CEL_OR_SPROUT::distance(found, last) == 1 ? last
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: found
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;
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}
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template<typename RandomAccessIterator, typename BinaryPredicate>
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inline SPROUT_CONSTEXPR RandomAccessIterator
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adjacent_find_impl_ra(
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RandomAccessIterator first, RandomAccessIterator last, BinaryPredicate pred,
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typename std::iterator_traits<RandomAccessIterator>::difference_type pivot, RandomAccessIterator found
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)
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{
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return found != first ? found
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: pivot == 0 ? (pred(*first, *last) ? first : last)
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: sprout::detail::adjacent_find_impl_ra(
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sprout::next(first, pivot), last, pred,
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(NS_SSCRISK_CEL_OR_SPROUT::distance(first, last) - pivot) / 2,
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sprout::detail::adjacent_find_impl_ra(
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first, sprout::next(first, pivot), pred,
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pivot / 2,
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first
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)
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)
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;
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}
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template<typename RandomAccessIterator, typename BinaryPredicate>
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inline SPROUT_CONSTEXPR RandomAccessIterator
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adjacent_find(
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RandomAccessIterator first, RandomAccessIterator last, BinaryPredicate pred,
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std::random_access_iterator_tag*
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)
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{
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return first == last || NS_SSCRISK_CEL_OR_SPROUT::distance(first, last) == 1 ? last
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: adjacent_find_impl_ra_1(
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sprout::detail::adjacent_find_impl_ra(
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first, sprout::next(first, NS_SSCRISK_CEL_OR_SPROUT::distance(first, last) - 1), pred,
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(NS_SSCRISK_CEL_OR_SPROUT::distance(first, last) - 1) / 2, first
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),
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last
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)
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;
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}
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// Copyright (C) 2011 RiSK (sscrisk)
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template<typename ForwardIterator, typename BinaryPredicate>
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inline SPROUT_CONSTEXPR ForwardIterator
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adjacent_find_impl(ForwardIterator first, ForwardIterator next, ForwardIterator last, BinaryPredicate pred) {
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return next == last ? last
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: pred(*first, *next) ? first
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: sprout::detail::adjacent_find_impl(next, sprout::next(next), last, pred)
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;
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}
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template<typename ForwardIterator, typename BinaryPredicate>
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inline SPROUT_CONSTEXPR ForwardIterator
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adjacent_find(
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ForwardIterator first, ForwardIterator last, BinaryPredicate pred,
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void*
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)
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{
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return first == last ? last
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: sprout::detail::adjacent_find_impl(first, sprout::next(first), last, pred)
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;
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}
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} //namespace detail
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// 25.2.8 Adjacent find
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//
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// recursion depth:
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// [first, last) is RandomAccessIterator -> O(log N)
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// otherwise -> O(N)
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//
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template<typename ForwardIterator, typename BinaryPredicate>
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inline SPROUT_CONSTEXPR ForwardIterator
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adjacent_find(ForwardIterator first, ForwardIterator last, BinaryPredicate pred) {
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typedef typename std::iterator_traits<ForwardIterator>::iterator_category* category;
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return sprout::detail::adjacent_find(first, last, pred, category());
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}
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template<typename ForwardIterator>
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inline SPROUT_CONSTEXPR ForwardIterator
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adjacent_find(ForwardIterator first, ForwardIterator last) {
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return sprout::adjacent_find(
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first, last,
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NS_SSCRISK_CEL_OR_SPROUT::equal_to<typename std::iterator_traits<ForwardIterator>::value_type>()
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);
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_ALGORITHM_ADJACENT_FIND_HPP
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