On Jun 6, 2008, at 5:48 PM, Bill Bumgarner wrote:
On Jun 6, 2008, at 3:23 PM, Quincey Morris wrote:In a GC-only app, I frequently use a pattern along these lines: NSData* data = <get it from somewhere>; const unsigned char* bytes = [data bytes]; NSUInteger count = [data length]; for (NSUInteger i = 0; i < count; i++) something = bytes [i];
In any case, you need to make sure that <data> stays alive throughout the entire lifespan of the bytes pointer. This is no different than in non-GC. If <data> were released sometime before the for loop were done, a similar crash would occur.
I'm a bit confused by this. In non-GC, data would not be released during the loop execution. Let's assume that it was autoreleased during the 'get it from somewhere'. It would only be actually released when execution returns to the main run loop; clearly after the entire loop above would be executed.
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