31 Input/output library [input.output]

31.7 Formatting and manipulators [iostream.format]

31.7.6 Output streams [output.streams]

31.7.6.2 Class template basic_ostream [ostream]

31.7.6.2.3 Assignment and swap [ostream.assign]

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basic_ostream& operator=(basic_ostream&& rhs);
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Effects: Equivalent to swap(rhs).
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Returns: *this.
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void swap(basic_ostream& rhs);
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Effects: Calls basic_ios<charT, traits>​::​swap(rhs).