objective c - Size already defined -

I was messing with my purpose- C ++ namespace today.

I have found that the handle, size and duration are already defined in ObjC ++, what are they defined and where are they defined?

I only have the name of Foundation / Foundation #

MacType H

  typed letters * PTR; Typingface PTR * Handle; Type size long size; Typing CIT 32 period;  

All of these preceding carbon

have nothing to do with cocoa, even if they fill in the namespace.