std::iter_swap(std::reverse_iterator) - cppreference.com
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(since C++20) | |
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
| x, y | - | reverse iterators to the elements to swap |
Complexity
Constant.
Exceptions
specification:
noexcept( std::is_nothrow_copy_constructible_v<Iter> && std::is_nothrow_copy_constructible_v<Iter2> && noexcept(ranges::iter_swap(--std::declval<Iter&>(), --std::declval<Iter2&>())) )
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'; }
Output:
See also
| swaps the values of two objects (function template) [edit] | |
| swaps two ranges of elements (function template) [edit] | |
| swaps the elements pointed to by two iterators (function template) [edit] | |
| swaps the values referenced by two dereferenceable objects (customization point object)[edit] | |
| swaps the objects pointed to by two underlying iterators (function template) [edit] |