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I see NSInteger is used quite often and the typedef for it on the iPhone is a long, so technically I could use it when I am expect int(64) values. But should I be more explicit and use something like int64_t or long directly? What would be the downside of just using long?
IIRC,
longon the iPhone/ARM is 32 bits. If you want a guaranteed 64-bit integer, you should (indeed) useint64_t.