Should we use std::move(callback)(resp) in the controller.

[Ayman250]

The examples suggest to use callback(resp). Doesn't this treat it as anormal lvalue and trigger the copy constructor. In which case what's the point of the rvalue reference parameter? I might be missing something.

[an-tao]

You don't have to use std::move, callback(resp) doesn't cause a copy of callback.