What kind of #if(compiler if) statements are available?

I hope I explained that well, but I'm talking about the #if statements that you can put into code, which tells the compiler to only compile a section of code if the condition is met. I've noticed a bunch in the Apple-provided headers, and I'm wondering, is there some kind of resource about what kind of conditions are available to put into these compiler statements?

 

Thank you, I didn't know the term preprocessor, and that's exactly what I was looking at, but I don't think I explained my question very well. It's not the different preprocessor directives that I'm looking for, it's more the different expressions that I can put into a preprocessor #if statement. For example, in foundation.h, there's a conditional compilation based on the statement;

Code:

#if (TARGET_OS_MAC && !(TARGET_OS_EMBEDDED || TARGET_OS_IPHONE)) || TARGET_OS_WIN32

The expressions used in this condition must have been defined at some point, so I'm wondering how I'm to know what kind of expressions/macros/constants I can use there. Is there some kind of listing, or guide to working with conditionals in XCode?

 

Thanks, that's a good idea, unfortunately when I ctrl-click on the macro, the "Jump to Definition" is greyed out? Could there be a setting in XCode that's preventing me from using this?

Also, a spotlight search won't find either of those two files that you listed. Back when I used Windows, there were "hidden files", does OXS do anything like that?