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Showing content from https://en.cppreference.com/w/cpp/algorithm/../ranges/../../cpp/utility/pair/swap.html below:

std::pair<T1,T2>::swap - cppreference.com

(1)

void swap( pair& other ) noexcept(/* see below */);

(since C++11)
(until C++20)

constexpr void swap( pair& other ) noexcept(/* see below */);

(since C++20)

constexpr void swap( const pair& other ) const noexcept(/* see below */);

(2) (since C++23)

Swaps first with other.first and second with other.second, as if by using std::swap; swap(first, other.first); swap(second, other.second);.

If either selected swap function call is ill-formed or does not swap the value of the member, the behavior is undefined.

(until C++23)

If either selected swap function call does not swap the value of the member, the behavior is undefined.

(since C++23) [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(10, "test"), p2;
    p2.swap(p1);
    std::cout << "(" << p2.first << ", " << p2.second << ")\n";
 
#if __cpp_lib_ranges_zip >= 202110L
    // Using the C++23 const qualified swap overload
    // (swap is no longer propagating pair constness)
    int i1 = 10, i2{};
    std::string s1("test"), s2;
    const std::pair<int&, std::string&> r1(i1, s1), r2(i2, s2);
    r2.swap(r1);
    std::cout << "(" << i2 << ", " << s2 << ")\n";
#endif
}

Possible output:

[edit] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior LWG 2456 C++11 the noexcept specification is ill-formed made to work [edit] See also swaps the values of two objects
(function template) [edit] swaps the contents of two tuples
(public member function of std::tuple<Types...>) [edit]

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