On Sep 15, 2008, at 00:42 , Alex Reynolds wrote:
Interesting: ... 2008-09-14 21:38:56.311 NSUIntTest[19750:10b] NSUInteger: 2 2008-09-14 21:38:56.329 NSUIntTest[19750:10b] NSUInteger: 1 2008-09-14 21:38:56.341 NSUIntTest[19750:10b] NSUInteger: 0 2008-09-14 21:38:56.344 NSUIntTest[19750:10b] NSUInteger: 4294967295 2008-09-14 21:38:56.344 NSUIntTest[19750:10b] NSUInteger: 4294967294 2008-09-14 21:38:56.346 NSUIntTest[19750:10b] NSUInteger: 4294967293 2008-09-14 21:38:56.354 NSUIntTest[19750:10b] NSUInteger: 4294967292 ...I will say that the NSLog was done for this particular example, just to see what's going on.The loop otherwise keeps rolling along, with or without an NSLog, %d or %u.Going without an NSLog is how I initially found out about this issue, in that my program would run into other problems related to this loop going past its bounds.
NSUInteger is an unsigned integer... thus, it can't be negative and your variable is underflowing. The various uint types are the same... unsigned integers. Disassemble your code in the debugger :) you'll see that since an unsigned integer ALWAYS evaluates to >= 0 by definition, the compiler has optimized out the comparison and simply generated an infinite loop.
NSUInteger is from 0 to NSUIntegerMax and NSInteger ranges between NSIntegerMin and NSIntegerMax. These types change size depending on whether you build a 64-bit app or a 32-bit app.
Jason
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