Use of rvalue reference members?

Question

I was wondering what use an rvalue reference member has

class A {
  // ...
  // Is this one useful?
  Foo &&f;
};

Does it have any bene

Answer 1

Just thinking out loud here, but wouldn't it have a use in functors? The constructor is often used for "currying", binding some parameters in advance, before the actual function call.

So in this context, the class member is just a staging ground (or a manually implemented closure) for the upcoming function call, and I see no reason why a rvalue reference wouldn't be meaningful there.

But in "regular" non-functor classes, I don't see much point.