What optimization does move semantics provide if we already have RVO?

Question

As far as I understand one of the purposes of adding move semantics is to optimize code by calling special constructor for copying \"temporary\" objects. For example, in th

Answer 1

There are many places some of which are mentioned in other answers.

One big one is that when resizing a std::vector it will move move-aware objects from the old memory location to the new one rather than copy and destroy the original.

Additionally rvalue references allow the concept of movable types, this is a semantic difference and not just an optimization. unique_ptr wasn't possible in C++03 which is why we had the abomination of auto_ptr.