29 Input/output library [input.output]

29.7 Formatting and manipulators [iostream.format]

29.7.4 Input streams [input.streams]

29.7.4.2 Class template basic_­istream [istream]

29.7.4.2.2 Constructors [istream.cons]

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explicit basic_istream(basic_streambuf<charT, traits>* sb);
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Effects: Initializes the base class subobject with basic_­ios​::​init(sb) ([basic.ios.cons]).
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Postconditions: gcount() == 0.
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basic_istream(basic_istream&& rhs);
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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();
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Remarks: Does not perform any operations of rdbuf().