std::swap(std::optional)

template< class T >
void swap( optional<T>& lhs, optional<T>& rhs ) noexcept(/* see below */);

Overloads the std::swap algorithm for std::optional. Exchanges the state of lhs with that of rhs. Effectively calls lhs.swap(rhs).

This function template does not participate in overload resolution unless std::is_move_constructible_v<T> and std::is_swappable_v<T> are both true.

Parameters

Return value

(none).

Exceptions

Example

See also