&& and move function

[margaritaville]

I got this code:

class A;
A&& foo()
{
  A a;
  return std::move(a);
}

My question is:
Should I get better performance if I use
A&& a = std::move(foo());
instead of
A&& a = foo();


Thank you.

[Bazzy]

std::move is needed to convert a l-value reference to an r-value reference. Since foo returns a r-val ref it won't have any effect