Testing for presence of Apple platform in C/C++/ObjC code

Are we running on an Apple platform?
#ifdef __APPLE__
#endif
Prerequisite for other tests
#ifdef __APPLE__
// let Apple define 
// various TARGET_OS_ 
// constants
#include  
#else
// not on Apple platform
#define TARGET_OS_MAC 0
#define TARGET_OS_IPHONE 0
#endif
Are we running on Mac OS X?
#if TARGET_OS_MAC && !TARGET_OS_IPHONE
….
#endif
Are we running on an iOS device?
#if TARGET_OS_IPHONE
….
#endif
// updated on Oct13 2010, previous method was flawed. sorry everyone!

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