How to return && object from function? [duplicate]

Question

I have TTempTable class with move symantics. I wrote

TTempTable&& MyFunction() {
   TTempTable tmp = f(...);
   ...
   return std::move(tmp);
}

and got no compiler errors.

Was this correct?

Wolsky

Have a look at this rule in the C++ Core Guidelines – Arguelles

Answer 1

No, it is not correct.

You're returning a reference to a local variable. That reference is dangling.

Like any dangling thing, the compiler won't [always] diagnose it for you.

Return by value, and remove the std::move (it's redundant and inhibits elision).

Reinareinald