std::swap(std::pair) (3) Linux Manual Page

std::swap(std::pair) – std::swap(std::pair)

Synopsis

Defined in header<utility>

    template <class T1, class T2>
    (since C++ 11)

        void swap(pair<T1, T2> &x, pair<T1, T2> &y) noexcept(/* see below */);
(until C++ 20)

    template <class T1, class T2>
    (since C++ 20)

        constexpr void swap(pair<T1, T2> &x, pair<T1, T2> &y) noexcept(/* see below */);

Swaps the contents of x and y. Equivalent to x.swap(y).
This function does not participate in overload resolution unless std::is_swappable_v<first_type> && std::is_swappable_v<second_type> is true. (since C++17)

Parameters

x, y – pairs whose contents to swap

Return value

(none)

Exceptions

noexcept specification:
noexcept(noexcept(x.swap(y)))

See also

     swaps the values of two objects
swap (function template)