| Defined in header <algorithm> | ||
|---|---|---|
template< class RandomIt > void partial_sort( RandomIt first, RandomIt middle, RandomIt last ); | (1) | |
template< class RandomIt, class Compare > void partial_sort( RandomIt first, RandomIt middle, RandomIt last, Compare comp ); | (2) |
Rearranges elements such that the range [first, middle) contains the sorted middle - first smallest elements in the range [first, last).
The order of equal elements is not guaranteed to be preserved. The order of the remaining elements in the range [middle, last) is unspecified. The first version uses operator< to compare the elements, the second version uses the given comparison function comp.
Parameters
| first, last | - | the range of elements to sort |
| comp | - | comparison function object (i.e. an object that satisfies the requirements of Compare) which returns true if the first argument is less than (i.e. is ordered before) the second. The signature of the comparison function should be equivalent to the following:
The signature does not need to have |
| Type requirements | ||
- RandomIt must meet the requirements of ValueSwappable and RandomAccessIterator. | ||
-The type of dereferenced RandomIt must meet the requirements of MoveAssignable and MoveConstructible. | ||
Return value
(none).
Complexity
Approximately (last-first)log(middle-first)) applications of cmp.
Example
#include <algorithm>
#include <functional>
#include <array>
#include <iostream>
int main()
{
std::array<int, 10> s{5, 7, 4, 2, 8, 6, 1, 9, 0, 3};
std::partial_sort(s.begin(), s.begin() + 3, s.end());
for (int a : s) {
std::cout << a << " ";
}
}Possible output:
0 1 2 7 8 6 5 9 4 3
See also
| partially sorts the given range making sure that it is partitioned by the given element (function template) | |
| copies and partially sorts a range of elements (function template) | |
| sorts a range of elements while preserving order between equal elements (function template) | |
| sorts a range into ascending order (function template) | |
| std::experimental::parallel::partial_sort
(parallelism TS) | parallelized version of std::partial_sort (function template) |
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