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40 lines
1.5 KiB
C++
40 lines
1.5 KiB
C++
#ifndef SPROUT_ALGORITHM_LOWER_BOUND_HPP
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#define SPROUT_ALGORITHM_LOWER_BOUND_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_ITERATOR_SSCRISK_CEL_OR_SPROUT
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#include HDR_FUNCTIONAL_SSCRISK_CEL_OR_SPROUT
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namespace sprout {
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// Copyright (C) 2011 RiSK (sscrisk)
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// 25.4.3.1 lower_bound
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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 T, typename Compare>
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inline SPROUT_CONSTEXPR ForwardIterator
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lower_bound(ForwardIterator first, ForwardIterator last, T const& value, Compare comp) {
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return first == last ? last
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: sprout::next(first) == last ? comp(*first, value) ? last : first
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: comp(*sprout::next(first, NS_SSCRISK_CEL_OR_SPROUT::distance(first, last) / 2), value)
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? sprout::lower_bound(sprout::next(first, NS_SSCRISK_CEL_OR_SPROUT::distance(first, last) / 2), last, value, comp)
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: sprout::lower_bound(first, sprout::next(first, NS_SSCRISK_CEL_OR_SPROUT::distance(first, last) / 2), value, comp)
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;
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}
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template<typename ForwardIterator, typename T>
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inline SPROUT_CONSTEXPR ForwardIterator
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lower_bound(ForwardIterator first, ForwardIterator last, T const& value) {
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return sprout::lower_bound(
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first, last, value,
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NS_SSCRISK_CEL_OR_SPROUT::less<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_LOWER_BOUND_HPP
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