Re: For what it's worth

Subject: Re: For what it's worth

From: Charlie Dickman <email@hidden>

Date: Sat, 26 Jan 2008 11:56:08 -0500

Delivered-to: email@hidden

I appreciate everyone's replies. New architecture requires new learning and I'm learning.

It occurred to me that the order of evaluation of arguments is not guaranteed; thanks for the reminder.

It was also a head slapper that the G$ and Intel chips are different endians. Again, thanks for the education.

The only thing I can say in defense of my own ignorance is that they worked when coded on the G4. At any raye I have fixed my errors.

Thanks

On Jan 26, 2008, at 12:47 AM, Charlie Dickman wrote:

In moving projects from Xcode 2 on Tiger (G4) to Xcode 3 on Leopard (Intel) I have found two cases of code (Objective C) that breaks in Xcode 3 on Leopard (Intel) that works perfectly fine in Xcode 2 on Tiger (G4)...

unsigned u = '\1\0\0\0';
u >>= 8;

results in u equal to '\0\1\0\0' in Xcode 2 on Tiger (G4) but results in '\1\1\0\0' in Xcode 3 on Leopard (Intel).

also

- (NSImageView *) imageViewFrom: (int) n, ... {
NSString *silverKey;
va_list ap;
va_start(ap, n);
switch (n) {
   case 1:
   silverKey = [NSString stringWithFormat: @"silverImageView%d", va_arg(ap, int)];
   break;
   case 2:
   silverKey = [NSString stringWithFormat: @"silverImageView%d%d", va_arg(ap, int), va_arg(ap, int)];
   break;
     default:
   va_end(ap);
   return nil;
}
va_end(ap);
NSImageView *silverImageView = [silverImageViews objectForKey: silverKey];
return silverImageView;
}

when invoked as

[self imageViewFrom: 2, 1, 10];

produces "silverImageView101" for the value of silverKey.
Using

   case 2: {
   int _1 = va_arg(ap, int);
   int _2 = va_arg(ap, int);
   silverKey = [NSString stringWithFormat: @"silverImageView%d%d", _1, _2];
   break;
   }

produces the expected result of "silverImageView110".

Charlie Dickman
email@hidden

Charlie Dickman

email@hidden

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References:

>For what it's worth (From: Charlie Dickman <email@hidden>)