guys, whats is exactly `&&` means? i believe i have a rough idea, say for example ```cpp int foo(int&& x) { return x; }, foo(10); // i believe is just like saying: int foo(...) { return 10; // (aka reference to the RValue => 10) },```
is this rough idea i have, acurate? can you guys explain in detail what is it? also can it be inversed? can foo return a reference to an R-Value?