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https://github.com/bolero-MURAKAMI/Sprout.git
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39 lines
1.4 KiB
C++
39 lines
1.4 KiB
C++
#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/algorithm/lower_bound.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 ForwardIterator, typename T, typename Compare>
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inline SPROUT_CONSTEXPR bool
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binary_search_impl(ForwardIterator first, ForwardIterator last, T const& value, Compare comp) {
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return (first != last && !comp(value, *first));
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}
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} // namespace detail
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// 25.4.3.4 binary_search
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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 bool
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binary_search(ForwardIterator first, ForwardIterator last, T const& value, Compare comp) {
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return sprout::detail::binary_search_impl(sprout::lower_bound(first, last, value), last, value, comp);
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}
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template<typename ForwardIterator, typename T>
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inline SPROUT_CONSTEXPR bool
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binary_search(ForwardIterator first, ForwardIterator last, T const& value) {
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return sprout::binary_search(
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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_BINARY_SEARCH_HPP
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