Mark Rowe wrote: > TN2064 appears to have been last modified in 2003, so it predates the > existence of Availability.h. >
Well, that’s about as long as I’ve been writing SDK- and deployment-target-aware code… Availability.h was introduced with the iOS SDK in order to support > availability macros that are compatible with both OS X and iOS, where the > older macros from AvailabilityMacros.h were specific to OS X. > Cool. Other than double-underscore paranoia, there’s no real difference or complaint from me. I guess the one drawback shared by <Availability.h>, <AvailabilityMacros.h>, and the outgoing BUILDING_ON_*/TARGETING_* macros is that if you forget to #include the right header, the preprocessor silently does something that you’re probably not expecting. Using a function-like macro like USE(), OS(), and PLATFORM() would help.
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