mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
40 lines
1.5 KiB
C++
40 lines
1.5 KiB
C++
#ifndef SPROUT_ALGORITHM_IS_HEAP_UNTIL_HPP
|
|
#define SPROUT_ALGORITHM_IS_HEAP_UNTIL_HPP
|
|
|
|
#include <cstddef>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/iterator/operation.hpp>
|
|
#include HDR_ITERATOR_SSCRISK_CEL_OR_SPROUT
|
|
#include HDR_FUNCTIONAL_SSCRISK_CEL_OR_SPROUT
|
|
|
|
namespace sprout {
|
|
// Copyright (C) 2011 RiSK (sscrisk)
|
|
|
|
namespace detail {
|
|
template<typename RandomAccessIterator, typename Compare>
|
|
inline SPROUT_CONSTEXPR RandomAccessIterator is_heap_until_impl(
|
|
RandomAccessIterator first,
|
|
RandomAccessIterator last,
|
|
Compare comp,
|
|
std::size_t n
|
|
)
|
|
{
|
|
return sprout::next(first, n) == last || !comp(first[n], first[(n - 1) / 2]) ? sprout::next(first, n)
|
|
: sprout::detail::is_heap_until_impl(first, last, comp, n + 1)
|
|
;
|
|
}
|
|
} // namespace detail
|
|
|
|
// 25.4.6.5 is_heap
|
|
template<typename RandomAccessIterator>
|
|
inline SPROUT_CONSTEXPR RandomAccessIterator is_heap_until(RandomAccessIterator first, RandomAccessIterator last) {
|
|
return sprout::is_heap_until(first, last, NS_SSCRISK_CEL_OR_SPROUT::less<decltype(*first)>());
|
|
}
|
|
|
|
template<typename RandomAccessIterator, typename Compare>
|
|
inline SPROUT_CONSTEXPR RandomAccessIterator is_heap_until(RandomAccessIterator first, RandomAccessIterator last, Compare comp) {
|
|
return NS_SSCRISK_CEL_OR_SPROUT::distance(first, last) < 2 ? last : sprout::detail::is_heap_until_impl(first, last, comp, 1);
|
|
}
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_ALGORITHM_IS_HEAP_UNTIL_HPP
|