27 Input/output library [input.output]

27.7 Formatting and manipulators [iostream.format]

27.7.5 Output streams [output.streams]

27.7.5.1 Class template basic_­ostream [ostream]

27.7.5.1.2 Assignment and swap [ostream.assign]

basic_ostream& operator=(basic_ostream&& rhs);
Effects: As if by swap(rhs).
Returns: *this.
void swap(basic_ostream& rhs);
Effects: Calls basic_­ios<charT, traits>::swap(rhs).