Sprout/sprout/algorithm/binary_search.hpp
2013-01-11 03:17:06 +09:00

39 lines
1.3 KiB
C++

#ifndef SPROUT_ALGORITHM_BINARY_SEARCH_HPP
#define SPROUT_ALGORITHM_BINARY_SEARCH_HPP
#include <iterator>
#include <sprout/config.hpp>
#include <sprout/algorithm/lower_bound.hpp>
#include HDR_FUNCTIONAL_SSCRISK_CEL_OR_SPROUT
namespace sprout {
namespace detail {
template<typename ForwardIterator, typename T, typename Compare>
inline SPROUT_CONSTEXPR bool
binary_search_impl(ForwardIterator first, ForwardIterator last, T const& value, Compare comp) {
return (first != last && !comp(value, *first));
}
} // namespace detail
// 25.4.3.4 binary_search
//
// recursion depth:
// O(log N)
//
template<typename ForwardIterator, typename T, typename Compare>
inline SPROUT_CONSTEXPR bool
binary_search(ForwardIterator first, ForwardIterator last, T const& value, Compare comp) {
return sprout::detail::binary_search_impl(sprout::lower_bound(first, last, value), last, value, comp);
}
template<typename ForwardIterator, typename T>
inline SPROUT_CONSTEXPR bool
binary_search(ForwardIterator first, ForwardIterator last, T const& value) {
return sprout::binary_search(
first, last, value,
NS_SSCRISK_CEL_OR_SPROUT::less<typename std::iterator_traits<ForwardIterator>::value_type>()
);
}
} // namespace sprout
#endif // #ifndef SPROUT_ALGORITHM_BINARY_SEARCH_HPP