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std::pair::swap

From cppreference.com
< cpp‎ | utility‎ | pair
void swap(pair& other);
(since C++11)

Swaps first with other.first and second with other.second.

This function does not participate in overload resolution unless std::is_swappable_v<first_type> && std::is_swappable_v<second_type>

(since C++17)

Contents

[edit] Parameters

other - pair of values to swap

[edit] Return value

(none)

[edit] Exceptions

[edit] Example

#include <iostream>
#include <utility>
#include <string>
int main()
{
    std::pair<int, std::string> p1, p2;
    p1 = std::make_pair(10, "test");
    p2.swap(p1);
    std::cout << "(" << p2.first << ", " << p2.second << ")\n";
}

Output:

(10, test)

[edit] See also

noexcept specification:  
noexcept(

     noexcept(std::swap(first, other.first)) &&
     noexcept(std::swap(second, other.second))

)
(until C++17)
noexcept specification:  
noexcept(

     std::is_nothrow_swappable<first_type>::value) &&
     std::is_nothrow_swappable<second_type>::value)

)
(since C++17)
swaps the values of two objects
(function template) [edit]