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std::sort

From cppreference.com
 
 
 
Defined in header <algorithm>
template< class RandomAccessIterator >
void sort( RandomAccessIterator first, RandomAccessIterator last );
(1)
template< class RandomAccessIterator, class Compare >
void sort( RandomAccessIterator first, RandomAccessIterator last, Compare comp );
(2)

Sorts the elements in the range [first, last) in ascending order. The order of equal elements is not guaranteed to be preserved. The first version uses operator< to compare the elements, the second version uses the given comparison function comp.

Contents

[edit] Parameters

first, last - the range of elements to sort
comp - comparison function which returns ​true if the first argument is less than the second.

The signature of the comparison function should be equivalent to the following:

bool cmp(const Type1 &a, const Type2 &b);

The signature does not need to have const &, but the function must not modify the objects passed to it.
The types  Type1 and  Type2 must be such that an object of type RandomAccessIterator can be dereferenced and then implicitly converted to both of them. ​

[edit] Return value

(none)

[edit] Complexity

O(N·log(N)), where N = std::distance(first, last) applications of cmp.

[edit] 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::sort(s.begin(), s.end());
    for (int a : s) {
        std::cout << a << " ";
    } 
    std::cout << '\n';
 
    std::sort(s.begin(), s.end(), std::greater<int>());
    for (int a : s) {
        std::cout << a << " ";
    } 
    std::cout << '\n';
}

Output:

0 1 2 3 4 5 6 7 8 9
9 8 7 6 5 4 3 2 1 0

[edit] See also

sorts the first N elements of a range
(function template) [edit]
sorts a range of elements while preserving order between equal elements
(function template) [edit]