iter_swap (std::counted_iterator)

Swaps the objects pointed to by two underlying iterators. The behavior is undefined if either x. count ( ) or y. count ( ) is equal to ​ 0 ​ .

The function body is equivalent to: ranges:: iter_swap ( x. base ( ) , y. base ( ) ) ; .

This function template is not visible to ordinary unqualified or qualified lookup , and can only be found by argument-dependent lookup when std:: counted_iterator < I > is an associated class of the arguments.

Parameters

Return value

(none)

Complexity

Constant.

Example

#include <iostream>
#include <iterator>
#include <list>
#include <vector>
 
int main()
{
    std::vector p{1, 2, 3, 4},
                q{5, 6, 7, 8};
 
    std::counted_iterator<std::vector<int>::iterator> ip{p.begin(), 2};
    std::counted_iterator<std::vector<int>::iterator> iq{q.begin(), 3};
 
    std::cout << *ip << ' ' << *iq << '\n';
    iter_swap(ip, iq); // ADL
    std::cout << *ip << ' ' << *iq << '\n';
 
    std::list x{0, 1, 3};
    std::counted_iterator<std::list<int>::iterator> ix{x.begin(), 2};
//  iter_swap(ip, ix); // error: not indirectly swappable
}

1 5
5 1

See also