std::swap(std::pair)

From cppreference.com
< cpp‎ | utility‎ | pair
Defined in header <utility>
template< class T1, class T2 >
void swap( pair<T1,T2>& lhs, pair<T1,T2>& rhs );
(since C++11)

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

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)