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43 lines
1.6 KiB
C++
43 lines
1.6 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2017 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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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 <iterator>
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#include <sprout/config.hpp>
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#include <sprout/algorithm/lower_bound.hpp>
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#include <sprout/functional/less.hpp>
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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 const& first, ForwardIterator const& 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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// O(log 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, comp), 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(first, last, value, sprout::less<>());
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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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