(Something*) SomethingElse

this is Code that I had seen in c++ codes.
As far as I understand it, it means that it converts a pointer of SomethingElse to a pointer of Something.

so to do that in BMax i tried :

Somethin ptr (SomethingElse)

is this all right?
I am asking because Sometime I am not getting what i wand.
edit:sorry I just figured out that this was ok.

Well its Max code, not C++, but that looks right. Give an example of how you don't get what you want.