Re: Problem with +numberWithBool: ?

[Richard Frith-Macdonald]

On 30 Jan 2004, at 11:26, Helge Hess wrote:

> On Jan 29, 2004, at 2:12 PM, Richard Frith-Macdonald wrote:
> > 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.
>
> Such an assumption (which is probably not backed by the ObjC "spec")

I have noticed that when you say 'probably' you seem to mean 'I haven't 
checked'  :-)

Page 178 of the NeXTstep reference, section headed Defined Types ...

'BOOL   A boolean value, either YES or NO'

I'm sure I've seen arguments about this before -  I judged the 
consensus to be that the
BOOL type is intended to be boolean, and the fact that it's stored as a 
char is an
implementation detail.

In practice, it matters little as long as you are consistent ... and 
are careful in cases
where you interface to unknown code.  Sometimes a problem with 
categories.
Nevertheless, I'd consider it very poor programming to return anything 
other than
YES or NO from a method declared to return BOOL.