23 Algorithms library [algorithms]

23.7 Sorting and related operations [alg.sorting]

23.7.1 Sorting [alg.sort]

23.7.1.3 partial_­sort [partial.sort]

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template<class RandomAccessIterator> constexpr void partial_sort(RandomAccessIterator first, RandomAccessIterator middle, RandomAccessIterator last); template<class ExecutionPolicy, class RandomAccessIterator> void partial_sort(ExecutionPolicy&& exec, RandomAccessIterator first, RandomAccessIterator middle, RandomAccessIterator last); template<class RandomAccessIterator, class Compare> constexpr void partial_sort(RandomAccessIterator first, RandomAccessIterator middle, RandomAccessIterator last, Compare comp); template<class ExecutionPolicy, class RandomAccessIterator, class Compare> void partial_sort(ExecutionPolicy&& exec, RandomAccessIterator first, RandomAccessIterator middle, RandomAccessIterator last, Compare comp);
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Requires: RandomAccessIterator shall satisfy the Cpp17ValueSwappable requirements ([swappable.requirements]).
The type of *first shall satisfy the Cpp17MoveConstructible (Table 25) and Cpp17MoveAssignable (Table 27) requirements.
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Effects: Places the first middle - first sorted elements from the range [first, last) into the range [first, middle).
The rest of the elements in the range [middle, last) are placed in an unspecified order.
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Complexity: Approximately (last - first) * log(middle - first) comparisons.