type&& syntax in C++11

Asked Jan 11 '13 at 11:44

Active Jan 11 '13 at 11:44

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Possible Duplicate:
Double Address Operator? (&&)

In the reference for the vector class: http://www.cplusplus.com/reference/vector/vector/vector/ I just noticed a strange syntax with two ampersands after the type name, e.g. in the constructor:

vector (vector&& x);

what does it mean and how does it work?

edited May 23 '17 at 11:43

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asked Jan 11 '13 at 11:44

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[move semantics; rvalue references](http://www.stroustrup.com/C++11FAQ.html#rval). – PaperBirdMaster Jan 11 '13 at 11:47
this is a move constructor, from the client side usage of vector does not change (and that's why it is so cool :)) – fen Jan 11 '13 at 11:51

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