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It works on Visual Studio,But on CodeBlocks it doesn't work

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tilblackout:
friend ostream& operator<<(ostream& os ,Fraction &&obj)
error: expected ',' or '...' before '&&' token|。
On VS there is no error.
How can I solve it?

Miguel Gimenez:
rvalue references needs a C++11 or newer compiler, did you activate C++11 mode in whatever compiler you are using (CodeBlocks is not a compiler)?

tilblackout:
THX，Solved.

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