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40 lines
1.4 KiB
C++
40 lines
1.4 KiB
C++
#ifndef SPROUT_ALGORITHM_IS_HEAP_UNTIL_HPP
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#define SPROUT_ALGORITHM_IS_HEAP_UNTIL_HPP
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#include <cstddef>
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#include <sprout/config.hpp>
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#include <sprout/iterator/operation.hpp>
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#include HDR_ITERATOR_SSCRISK_CEL_OR_SPROUT
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#include HDR_FUNCTIONAL_SSCRISK_CEL_OR_SPROUT
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namespace sprout {
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// Copyright (C) 2011 RiSK (sscrisk)
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namespace detail {
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template<typename RandomAccessIterator, typename Compare>
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SPROUT_CONSTEXPR RandomAccessIterator is_heap_until_impl(
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RandomAccessIterator first,
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RandomAccessIterator last,
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Compare comp,
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std::size_t n
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)
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{
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return sprout::next(first, n) == last || !comp(first[n], first[(n - 1) / 2]) ? sprout::next(first, n)
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: sprout::detail::is_heap_until_impl(first, last, comp, n + 1)
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;
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}
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} // namespace detail
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// 25.4.6.5 is_heap
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template<typename RandomAccessIterator>
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SPROUT_CONSTEXPR RandomAccessIterator is_heap_until(RandomAccessIterator first, RandomAccessIterator last) {
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return sprout::is_heap_until(first, last, NS_SSCRISK_CEL_OR_SPROUT::less<decltype(*first)>());
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}
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template<typename RandomAccessIterator, typename Compare>
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SPROUT_CONSTEXPR RandomAccessIterator is_heap_until(RandomAccessIterator first, RandomAccessIterator last, Compare comp) {
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return NS_SSCRISK_CEL_OR_SPROUT::distance(first, last) < 2 ? last : sprout::detail::is_heap_until_impl(first, last, comp, 1);
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_ALGORITHM_IS_HEAP_UNTIL_HPP
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