When is static cast safe when you are using multiple inheritance?

Question

I found myself in a situation where I know what type something is. The Type is one of three (or more) levels of inheritance. I call factory which returns B* how

Answer 1

If Derived has Base as a public (or otherwise accessible) base class, and d is of type Derived*, then static_cast(d) is an upcast.

This is always technically safe.

And generally unnecessary, except for cases where you have hiding (shadowing) of method.

Cheers & hth.,