std::swap(std::optional) (3) - Linux Man Pages

std::swap(std::optional): std::swap(std::optional)

NAME

std::swap(std::optional) - std::swap(std::optional)

Synopsis


Defined in header <optional>
template< class T > (since C++17)
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


lhs, rhs - optional objects whose states to swap

Return value


(none)

Exceptions


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

Example


 This section is incomplete
 Reason: no example

See also


     exchanges the contents
swap (public member function)