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

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)