mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-12-25 21:35:41 +00:00
60 lines
2.4 KiB
C++
60 lines
2.4 KiB
C++
/*=============================================================================
|
|
Copyright (c) 2011-2015 Bolero MURAKAMI
|
|
Copyright (C) 2011 RiSK (sscrisk)
|
|
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_EQUAL_RANGE_HPP
|
|
#define SPROUT_ALGORITHM_EQUAL_RANGE_HPP
|
|
|
|
#include <iterator>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/algorithm/lower_bound.hpp>
|
|
#include <sprout/algorithm/upper_bound.hpp>
|
|
#include <sprout/iterator/operation.hpp>
|
|
#include <sprout/functional/less.hpp>
|
|
#include <sprout/utility/pair/pair.hpp>
|
|
|
|
namespace sprout {
|
|
namespace detail {
|
|
template<typename ForwardIterator, typename T, typename Compare>
|
|
inline SPROUT_CONSTEXPR sprout::pair<ForwardIterator, ForwardIterator>
|
|
equal_range(
|
|
ForwardIterator first, typename std::iterator_traits<ForwardIterator>::difference_type len,
|
|
T const& value, Compare comp
|
|
)
|
|
{
|
|
return len == 0 ? sprout::pair<ForwardIterator, ForwardIterator>(first, first)
|
|
: comp(*sprout::next(first, len / 2), value)
|
|
? sprout::detail::equal_range(sprout::next(first, len / 2 + 1), len - (len / 2 + 1), value, comp)
|
|
: comp(value, *sprout::next(first, len / 2))
|
|
? sprout::detail::equal_range(first, len / 2, value, comp)
|
|
: sprout::pair<ForwardIterator, ForwardIterator>(
|
|
sprout::detail::lower_bound(first, len / 2, value, comp),
|
|
sprout::detail::upper_bound(sprout::next(first, len / 2 + 1), len - (len / 2 + 1), value, comp)
|
|
)
|
|
;
|
|
}
|
|
} // namespace detail
|
|
|
|
// 25.4.3.3 equal_range
|
|
//
|
|
// recursion depth:
|
|
// O(log N)
|
|
//
|
|
template<typename ForwardIterator, typename T, typename Compare>
|
|
inline SPROUT_CONSTEXPR sprout::pair<ForwardIterator, ForwardIterator>
|
|
equal_range(ForwardIterator first, ForwardIterator last, T const& value, Compare comp) {
|
|
return sprout::detail::equal_range(first, sprout::distance(first, last), value, comp);
|
|
}
|
|
|
|
template<typename ForwardIterator, typename T>
|
|
inline SPROUT_CONSTEXPR sprout::pair<ForwardIterator, ForwardIterator>
|
|
equal_range(ForwardIterator first, ForwardIterator last, T const& value) {
|
|
return sprout::equal_range(first, last, value, sprout::less<>());
|
|
}
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_ALGORITHM_EQUAL_RANGE_HPP
|