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preprocessor directive to determine OS?

Hi all,

I have a fairly simple question. I'm writing a C/C++ application and want to make it cross-platform, so it will include different modules for different operating systems. The first target system is OS X 10.2 or higher, with an eventual port to Win32. Can someone tell me, what are the macros used by OS X to indicate the OS name and version? For example, to have system-specific code I would do something like this:

#if defined MAC_OS_X
// OS X specific code
#elif defined WINDOWS
//windows specific code
#elif defined SOME_OTHER_OS
//some other code
...
...

Well you get the picture. Anyway, I need to know what macros to put in instead of my fake "MAC_OS_X" and "WINDOWS" macros. Thanks a lot.

Ilya Maykov
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