[istream.cons]

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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.

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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.

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virtual ~basic_istream();

Remarks: Does not perform any operations of rdbuf().

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]