C++ preprocessor directive to identify OSX

I'm writing a cross platform console application. It already runs on Windows, Linux (all distros), Unix, and OSX. There is one system call in the code to clear the screen. Linux, Unix, and OSX use "clear" to clear the screen, while Windows (at the console level) uses "cls".
While it is a trivial problem to change a macro each time I compile for a different platform, it would be nice to have a preprocessor directive do this for me. Can anyone help out here? What preprocessor directive would I use to identify that I'm compiling on/for OSX?
Thanks.

It depends. WIN32 is probably going to be defined. MSC_VER is probably going to be defined too. Check for your documentation for your Windows compiler. I am hedging my answer a bit because the answer depends on what compiler you are using. If you are using GCC, then you may not have those symbols defined. But, if you are using GCC on Windows then you probably have this problem to begin with.
A better approach would be to write a "clear()" function for Windows that calls "cls". Then, your application doesn't need any OS identification. You would put the "clear()" function and all other Windows-specific code into a glue.c source file that is only linked into the Windows version.
A good goal to aim for is to make your core application logic independent of any operating system. Each build system for each OS would have a set of ancillary files (like the glue.c source) that enables it to build for that OS. You want to keep that ancillary set of files as small as possible. If you have a console application, that should be easy. Code to the curses library and install some Windows curses port.

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Jarojasag wrote:
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There's really not much in my K&R C Programming language, circa 1978 2nd printing...

There's a section on the preprocessor in the book Beginning Mac OS X Programming by Wrox, but it's all based around C, not Objective-C like the code in your examples, so I don't know if that would be helpful to you or not.
I'm not a very experienced programmer, so I was hesitant to even reply, and I'll warn you now that I don't think this post will be of any help to you, but since you haven't gotten any other replies yet, I figured I'd try. Hopefully someone else around here will come along and actually help you.
Anyways, let's say you had two functions defined in your program -- their declarations are:
void PrintAddresses( );
void PrintPhoneNumbers( );
you could ideally use a macro as a way of calling the desired function. In C, the basic syntax for writing a macro like the one you wrote often uses the ternary operator. I don't know enough about Objective-C to know how that would fit in, but in C it would be simple enough:
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Message was edited by: Tron55555

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