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Showing content from https://timsong-cpp.github.io/cppwp/n4659/partial.sort.copy below:

[partial.sort.copy]

28 Algorithms library [algorithms] 28.7 Sorting and related operations [alg.sorting] 28.7.1 Sorting [alg.sort] 28.7.1.4 partial_­sort_­copy [partial.sort.copy]

template<class InputIterator, class RandomAccessIterator> RandomAccessIterator partial_sort_copy(InputIterator first, InputIterator last, RandomAccessIterator result_first, RandomAccessIterator result_last); template<class ExecutionPolicy, class ForwardIterator, class RandomAccessIterator> RandomAccessIterator partial_sort_copy(ExecutionPolicy&& exec, ForwardIterator first, ForwardIterator last, RandomAccessIterator result_first, RandomAccessIterator result_last); template<class InputIterator, class RandomAccessIterator, class Compare> RandomAccessIterator partial_sort_copy(InputIterator first, InputIterator last, RandomAccessIterator result_first, RandomAccessIterator result_last, Compare comp); template<class ExecutionPolicy, class ForwardIterator, class RandomAccessIterator, class Compare> RandomAccessIterator partial_sort_copy(ExecutionPolicy&& exec, ForwardIterator first, ForwardIterator last, RandomAccessIterator result_first, RandomAccessIterator result_last, Compare comp);

Effects: Places the first min(last - first, result_­last - result_­first) sorted elements into the range [result_­first, result_­first + min(last - first, result_­last - result_­first)).

Returns: The smaller of: result_­last or result_­first + (last - first).

Complexity: Approximately (last - first) * log(min(last - first, result_­last - result_­first)) comparisons.


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