30 Input/output library [input.output]

30.7 Formatting and manipulators [iostream.format]

30.7.4 Input streams [input.streams]

30.7.4.1 Class template basic_­istream [istream]

30.7.4.1.1 basic_­istream constructors [istream.cons]

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explicit basic_istream(basic_streambuf<charT, traits>* sb);
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Effects: Constructs an object of class basic_­istream, initializing 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: Move constructs from the rvalue rhs.
This is accomplished by default constructing the base class, copying the gcount() from rhs, calling basic_­ios<charT, traits>​::​move(rhs) to initialize the base class, and setting the gcount() for rhs to 0.
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virtual ~basic_istream();
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Effects: Destroys an object of class basic_­istream.
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Remarks: Does not perform any operations of rdbuf().