The A&& thing is a proposal (i.e. not in the stadard, yet) called rvalue reference, which you would’ve been familiar with (or at least read about) if you followed links in this post.

It’s true that one shouldn’t code something like A&& under current C++ standard, and it’s likely true those code won’t compile (if not interpreted as something else by faulty compilers), neither. But apparently, you have no clue what it was.

Please be less assertive in wording next time, otherwise I would expect you to know what you are talking about, or at least followed links in my post.

What is A&&? You cannot have a reference to a reference. It is disallowed in C++.

Adrian