mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-11-14 10:39:05 +00:00
55 lines
2 KiB
C++
55 lines
2 KiB
C++
/*=============================================================================
|
|
Copyright (c) 2011 RiSK (sscrisk)
|
|
https://github.com/sscrisk/CEL---ConstExpr-Library
|
|
|
|
Copyright (c) 2011-2016 Bolero MURAKAMI
|
|
https://github.com/bolero-MURAKAMI/Sprout
|
|
|
|
Distributed under the Boost Software License, Version 1.0. (See accompanying
|
|
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
=============================================================================*/
|
|
#ifndef SPROUT_ALGORITHM_UPPER_BOUND_HPP
|
|
#define SPROUT_ALGORITHM_UPPER_BOUND_HPP
|
|
|
|
#include <iterator>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/iterator/next.hpp>
|
|
#include <sprout/iterator/distance.hpp>
|
|
#include <sprout/functional/less.hpp>
|
|
|
|
namespace sprout {
|
|
namespace detail {
|
|
template<typename ForwardIterator, typename T, typename Compare>
|
|
inline SPROUT_CONSTEXPR ForwardIterator
|
|
upper_bound(
|
|
ForwardIterator const& first, typename std::iterator_traits<ForwardIterator>::difference_type len,
|
|
T const& value, Compare comp
|
|
)
|
|
{
|
|
return len == 0 ? first
|
|
: comp(value, *sprout::next(first, len / 2))
|
|
? sprout::detail::upper_bound(first, len / 2, value, comp)
|
|
: sprout::detail::upper_bound(sprout::next(first, len / 2 + 1), len - (len / 2 + 1), value, comp)
|
|
;
|
|
}
|
|
} // namespace detail
|
|
|
|
// 25.4.3.2 upper_bound
|
|
//
|
|
// recursion depth:
|
|
// O(log N)
|
|
//
|
|
template<typename ForwardIterator, typename T, typename Compare>
|
|
inline SPROUT_CONSTEXPR ForwardIterator
|
|
upper_bound(ForwardIterator first, ForwardIterator last, T const& value, Compare comp) {
|
|
return sprout::detail::upper_bound(first, sprout::distance(first, last), value, comp);
|
|
}
|
|
|
|
template<typename ForwardIterator, typename T>
|
|
inline SPROUT_CONSTEXPR ForwardIterator
|
|
upper_bound(ForwardIterator first, ForwardIterator last, T const& value) {
|
|
return sprout::upper_bound(first, last, value, sprout::less<>());
|
|
}
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_ALGORITHM_UPPER_BOUND_HPP
|