mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-12-23 21:25:49 +00:00
39 lines
1.8 KiB
C++
39 lines
1.8 KiB
C++
#ifndef SPROUT_ALGORITHM_BINARY_SEARCH_HPP
|
|
#define SPROUT_ALGORITHM_BINARY_SEARCH_HPP
|
|
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/iterator/operation.hpp>
|
|
#include HDR_ITERATOR_SSCRISK_CEL_OR_SPROUT
|
|
|
|
namespace sprout {
|
|
// Copyright (C) 2011 RiSK (sscrisk)
|
|
|
|
// 25.4.3.4 binary_search
|
|
template<typename ForwardIterator, typename T>
|
|
inline SPROUT_CONSTEXPR bool
|
|
binary_search(ForwardIterator first, ForwardIterator last, T const& value) {
|
|
return first == last ? false
|
|
: sprout::next(first) == last ? !(*first < value) && !(value < *first) ? true : false
|
|
: *sprout::next(first, NS_SSCRISK_CEL_OR_SPROUT::distance(first, last) / 2) < value
|
|
? sprout::binary_search(sprout::next(first, NS_SSCRISK_CEL_OR_SPROUT::distance(first, last) / 2), last, value)
|
|
: value < *sprout::next(first, NS_SSCRISK_CEL_OR_SPROUT::distance(first, last)) / 2
|
|
? sprout::binary_search(first, sprout::next(first, NS_SSCRISK_CEL_OR_SPROUT::distance(first, last) / 2), value)
|
|
: true
|
|
;
|
|
}
|
|
|
|
template<typename ForwardIterator, typename T, typename Compare>
|
|
inline SPROUT_CONSTEXPR bool
|
|
binary_search(ForwardIterator first, ForwardIterator last, T const& value, Compare comp) {
|
|
return first == last ? false
|
|
: sprout::next(first) == last ? !comp(*first, value) && !comp(value, *first) ? true : false
|
|
: comp(*sprout::next(first, NS_SSCRISK_CEL_OR_SPROUT::distance(first, last) / 2), value)
|
|
? sprout::binary_search(sprout::next(first, NS_SSCRISK_CEL_OR_SPROUT::distance(first, last) / 2), last, value)
|
|
: comp(value, *sprout::next(first, NS_SSCRISK_CEL_OR_SPROUT::distance(first, last)) / 2)
|
|
? sprout::binary_search(first, sprout::next(first, NS_SSCRISK_CEL_OR_SPROUT::distance(first, last) / 2), value)
|
|
: true
|
|
;
|
|
}
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_ALGORITHM_BINARY_SEARCH_HPP
|