30 Input/output library [input.output]

30.9 File-based streams [file.streams]

30.9.4 Class template basic_­ofstream [ofstream]

30.9.4.2 Assign and swap [ofstream.assign]

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