std::experimental::optional<T>::swap

void swap( optional& other ) noexcept ( /* see below */ ) ;		(library fundamentals TS)

Swaps the contents with those of other.

• If neither *this nor other contain a value, the function has no effect.

• If only one of *this and other contains a value (let's call this object in and the other un), the contained value of un is direct-initialized from std::move(*in) , followed by destruction of the contained value of in as if by in.val->T::~T() . After this call, in does not contain a value un

• If both *this and other contain values, the contained values are exchanged by calling using std::swap ; swap( **this, *other) . T lvalues must satisfy Swappable

Parameters

other

-

the optional object to exchange the contents with

Return value

(none)

Exceptions

In the case of thrown exception, the states of the contained values of *this and other are determined by the exception safety guarantees of swap of type T or T's move constructor, whichever is called. For both *this and other

See also

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

specializes the std::swap algorithm (function)