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Re: NSUInteger in for-loop?
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Re: NSUInteger in for-loop?


  • Subject: Re: NSUInteger in for-loop?
  • From: Jason Coco <email@hidden>
  • Date: Mon, 15 Sep 2008 00:49:51 -0400


On Sep 15, 2008, at 00:44 , Alex Reynolds wrote:

The %lu with casting seems to run into the same issue as %u:

...
2008-09-14 21:43:07.241 NSUIntTest[19779:10b] NSUInteger: 2
2008-09-14 21:43:07.259 NSUIntTest[19779:10b] NSUInteger: 1
2008-09-14 21:43:07.260 NSUIntTest[19779:10b] NSUInteger: 0
2008-09-14 21:43:07.261 NSUIntTest[19779:10b] NSUInteger: 4294967295
2008-09-14 21:43:07.262 NSUIntTest[19779:10b] NSUInteger: 4294967294
...

Interesting.

It does this because your building a 32-bit app. The NSUInteger will change size in a 64-bit app which is why using %lu and typecasting to (unsigned long) is recommended (this will ensure that you don't get warnings if you build a 64-bit app from the same code). Too demonstrate, recompile your app as such:


gcc -o <myapp> myapp.m -arch x86_64 -framework Foundation

(this assumes an Intel processor... if you're using a PPC then use ppc64 instead of x86_64 for the arch).

Jason

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References: 
 >NSUInteger in for-loop? (From: Alex Reynolds <email@hidden>)
 >Re: NSUInteger in for-loop? (From: j o a r <email@hidden>)
 >Re: NSUInteger in for-loop? (From: Alex Reynolds <email@hidden>)

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