Question

I can’t seem to find an answer to this question by Googling. Can I assume that the Objective-C preprocessor works exactly identically to the C preprocessor, and that anything I read about the C preprocessor applies exactly the same way in an Objective C environment? Or are there subtle differences?

Answer 1

There are some subtle differences:

• The include paths are different depending on what language you are using.
• I believe that #import triggers a warning if you’re not using ObjC.
• The preprocessor may have some special cases to handle the ObjC @"string" syntax.
• And, of course, most importantly, the language affects which macros are predefined (e.g, __objc__).

It’s still cpp either way, though — it’s just operating in a different mode.