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std::swap(std::pair)

Defined in header <utility> 
template< class T1, class T2 >
void swap( pair<T1,T2>& lhs, pair<T1,T2>& rhs ) noexcept(/* see below */);
 (since C++11)

Swaps the contents of lhs and rhs. Equivalent to lhs.swap(rhs).

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

lhs, rhs - pairs whose contents to swap

Return value

(none).

Exceptions

noexcept specification:
noexcept(noexcept(lhs.swap(rhs)))

See also

swaps the values of two objects
(function template)

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