27 Input/output library [input.output]

27.7 Formatting and manipulators [iostream.format]

27.7.2 Input streams [input.streams]

27.7.2.1 Class template basic_istream [istream]

27.7.2.1.2 Class basic_istream assign and swap [istream.assign]

basic_istream& operator=(basic_istream&& rhs);

Effects: swap(rhs);.

Returns: *this.

void swap(basic_istream& rhs);

Effects: Calls basic_ios<charT, traits>::swap(rhs). Exchanges the values returned by gcount() and rhs.gcount().