27 Input/output library [input.output]

27.9 File-based streams [file.streams]

27.9.5 Class template basic_­fstream [fstream]

27.9.5.2 Assign and swap [fstream.assign]

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basic_fstream& operator=(basic_fstream&& 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_fstream& rhs);
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Effects: Exchanges the state of *this and rhs by calling basic_­iostream<charT,traits>​::​swap(rhs) and sb.swap(rhs.sb).
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template<class charT, class traits> void swap(basic_fstream<charT, traits>& x, basic_fstream<charT, traits>& y);
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Effects: As if by x.swap(y).