std:: iter_swap (std::reverse_iterator)

Swaps the objects pointed to by two adjusted underlying iterators.

Equivalent to auto tmp_x = x. base ( ) ;
auto tmp_y = y. base ( ) ;
ranges:: iter_swap ( -- tmp_x, -- tmp_y ) ; .

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

Parameters

Complexity

Constant.

Exceptions

Example

#include <iostream>
#include <iterator>
#include <list>
#include <vector>
 
int main()
{
    std::vector v{1, 2, 3};
    std::list l{4, 5, 6};
 
    std::reverse_iterator<std::vector<int>::iterator> r1{v.rbegin()};
    std::reverse_iterator<std::list<int>::iterator> r2{l.rbegin()};
 
    std::cout << *r1 << ' ' << *r2 << '\n';
 
    iter_swap(r1, r2); // ADL
 
    std::cout << *r1 << ' ' << *r2 << '\n';
}

3 6
6 3

See also