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Re: Problem with +numberWithBool: ?
From: |
Alexander Malmberg |
Subject: |
Re: Problem with +numberWithBool: ? |
Date: |
Thu, 29 Jan 2004 15:00:42 +0100 |
Richard Frith-Macdonald wrote:
> I agree it'll return boolN ... but 2 is not YES
> Booleans in objc can be YES or NO ... this is not the same thing as
> true/false in C/ObjC conditionals where 0 is false and anything
> non-zero is true.
Why would a BOOL be different from any other truth value in c or
objective-c? I have never seen anything that implies that, and to me, it
seems incorrect. In fact, looking at apple's docs for -boolValue, we
see: ""The value returned by this method isn't guaranteed to be one of
YES or NO. A 0 value always means NO or false, but any nonzero value
should be interpreted as YES or true."" .
(http://developer.apple.com/documentation/Cocoa/Reference/Foundation/ObjC_classic/Classes/NSNumber.html)
> So ...
>
> if (x)...
> is not the same as
> if (x == YES)
> where x is of type BOOL
>
> which is why I prefer to write code which explicitly compares booleans
> values with YES or NO.
But, as this bug shows, you should never explicitly compare with YES.
IMO, doing so is incorrect, or at best extremely pedantic.
- Alexander Malmberg
- Problem with +numberWithBool: ?, Manuel Guesdon, 2004/01/29
- Re: Problem with +numberWithBool: ?, Richard Frith-Macdonald, 2004/01/29
- Re: Problem with +numberWithBool: ?, David Ayers, 2004/01/29
- Re: Problem with +numberWithBool: ?,
Alexander Malmberg <=
- Re[2]: Problem with +numberWithBool: ?, Manuel Guesdon, 2004/01/29
- Re: Problem with +numberWithBool: ?, Helge Hess, 2004/01/30
- [RFA]: BOOL coding standards (Was: Problem with +numberWithBool: ?), Alexander Malmberg, 2004/01/30
- Re: [RFA]: BOOL coding standards (Was: Problem with +numberWithBool: ?), David Ayers, 2004/01/30
- Re: [RFA]: BOOL coding standards (Was: Problem with +numberWithBool: ?), Nicola Pero, 2004/01/30
- Re[2]: [RFA]: BOOL coding standards (Was: Problem with +numberWithBool: ?), Manuel Guesdon, 2004/01/30
- Re[2]: [RFA]: BOOL coding standards (Was: Problem with +numberWithBool: ?), Nicola Pero, 2004/01/30