[ostream.rvalue] (original) (raw)

31 Input/output library [input.output]

31.7 Formatting and manipulators [iostream.format]

31.7.6 Output streams [output.streams]

31.7.6.6 Rvalue stream insertion [ostream.rvalue]

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template<class Ostream, class T> Ostream&& operator<<(Ostream&& os, const T& x);

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Constraints: The expression os << x is well-formed when treated as an unevaluated operand andOstream is publicly and unambiguously derived from ios_base.

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Effects: As if by: os << x;

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Returns: std​::​move(os).