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https://github.com/bolero-MURAKAMI/Sprout.git
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38 lines
1.7 KiB
C++
38 lines
1.7 KiB
C++
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#ifndef SPROUT_ALGORITHM_BINARY_SEARCH_HPP
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#define SPROUT_ALGORITHM_BINARY_SEARCH_HPP
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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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namespace sprout {
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// Copyright (C) 2011 RiSK (sscrisk)
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// 25.4.3.4 binary_search
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template<typename ForwardIterator, typename T>
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SPROUT_CONSTEXPR bool binary_search(ForwardIterator first, ForwardIterator last, T const& value) {
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return first == last ? false
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: sprout::next(first) == last ? !(*first < value) && !(value < *first) ? true : false
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: *(first + NS_SSCRISK_CEL_OR_SPROUT::distance(first, last) / 2) < value
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? sprout::binary_search(first + NS_SSCRISK_CEL_OR_SPROUT::distance(first, last) / 2, last, value)
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: value < *(first + NS_SSCRISK_CEL_OR_SPROUT::distance(first, last)) / 2
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? sprout::binary_search(first, first + NS_SSCRISK_CEL_OR_SPROUT::distance(first, last) / 2, value)
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: true
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;
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}
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template<typename ForwardIterator, typename T, typename Compare>
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SPROUT_CONSTEXPR bool binary_search(ForwardIterator first, ForwardIterator last, T const& value, Compare comp) {
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return first == last ? false
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: sprout::next(first) == last ? !comp(*first, value) && !comp(value, *first) ? true : false
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: comp(*(first + NS_SSCRISK_CEL_OR_SPROUT::distance(first, last) / 2), value)
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? sprout::binary_search(first + NS_SSCRISK_CEL_OR_SPROUT::distance(first, last) / 2, last, value)
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: comp(value, *(first + NS_SSCRISK_CEL_OR_SPROUT::distance(first, last)) / 2)
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? sprout::binary_search(first, first + NS_SSCRISK_CEL_OR_SPROUT::distance(first, last) / 2, value)
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: true
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;
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_ALGORITHM_BINARY_SEARCH_HPP
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