29 Input/output library [input.output]

29.9 File-based streams [file.streams]

29.9.3 Class template basic_­ifstream [ifstream]

29.9.3.2 Assignment and swap [ifstream.assign]

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basic_ifstream& operator=(basic_ifstream&& rhs);
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Effects: Move assigns the base and members of *this from the base and corresponding members of rhs.
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Returns: *this.
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void swap(basic_ifstream& rhs);
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Effects: Exchanges the state of *this and rhs by calling basic_­istream<charT, traits>​::​swap(rhs) and sb.swap(rhs.sb).
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template<class charT, class traits> void swap(basic_ifstream<charT, traits>& x, basic_ifstream<charT, traits>& y);
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Effects: As if by x.swap(y).