31 Input/output library [input.output]

31.7 Formatting and manipulators [iostream.format]

31.7.5 Input streams [input.streams]

31.7.5.2 Class template basic_­istream [istream]

31.7.5.2.2 Constructors [istream.cons]

explicit basic_istream(basic_streambuf<charT, traits>* sb);
Effects: Initializes the base class subobject with basic_­ios​::​init(sb) ([basic.ios.cons]).
Postconditions: gcount() == 0.
basic_istream(basic_istream&& rhs);
Effects: Default constructs the base class, copies the gcount() from rhs, calls basic_­ios<charT, traits>​::​move(rhs) to initialize the base class, and sets the gcount() for rhs to 0.
virtual ~basic_istream();
Remarks: Does not perform any operations of rdbuf().