31 Input/output library [input.output]

31.10 File-based streams [file.streams]

31.10.5 Class template basic_fstream [fstream]

31.10.5.3 Swap [fstream.swap]

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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);
2
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Effects: Equivalent to: x.swap(y).