Move semantics std::move?

Think about what happens if T is an lvalue reference, for example MyClass & In that case T && would become MyClass & && and due to reference collapsing rules this would be transformed into MyClass & again. To achieve the right result typename remove_reference::type&& first removes any reference decorations from the type, so MyClass & is mapped to MyClass and then the rvalue reference is applied to it, yielding MyClass &&.

Think about what happens if T is an lvalue reference, for example MyClass &. In that case, T && would become MyClass & &&, and due to reference collapsing rules, this would be transformed into MyClass & again. To achieve the right result, typename remove_reference::type&& first removes any reference decorations from the type, so MyClass & is mapped to MyClass, and then the rvalue reference is applied to it, yielding MyClass &&.

I see no downvote on my answer so far... – FredOverflow Apr 3 at 12:14 Uhm. I wrote the same thing 10 minutes before you and got down-voted. – Let_Me_Be Apr 3 at 12:16 @Let: Hm, I would guess your explanation was a little bit too terse for someone unfamiliar with rvalue references, dunno... – FredOverflow Apr 3 at 12:26 Kind of weird for someone unfamiliar with the topic to downvote an answer.

Not that I care. I just wanted to point out that someone disagrees with this explanation. – Let_Me_Be Apr 3 at 12:28.

Because rvalue reference to lvalue reference would decay to lvalue reference. And returing lvalue reference would invoke different semantics, then those you would expect from move. Edit: Huh, why the downvote?

Check out this code: template T&& func(T&& x) { return x; } int main() { int x; int &y = func(x); } Further reading: justsoftwaresolutions.co.uk/cplusplus/rv....

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