--- Eyal Redler <email@hidden> wrote:
Hi,
I'm not sure where and when but I recall reading
something about ObjC
BOOL type values YES and NO not being the same as
whet a boolean
expression might produce.
I can't recall the exact details but there was some
kind of gotcha
related to this. For example, the expression
BOOL myBool=(myInt==1);
might set myBool differently then
BOOL myBool=(myInt==1)?YES:NO;
The two expressions are equivalent. YES is defined as
(BOOL)1, while NO is defined as (BOOL)0.
Or maybe it was that
if (myBool)
[foo bar];
will perform differently then
if (myBool==YES)
[foo bar];
I wouldn't say it will work differently, but it might.
There's no language constraint that says a BOOL can
only be set to YES or NO (though I wouldn't
intentionally set a BOOL to some other value). So if a
method returns a nonzero value that is not 1, if
(myBool) will evaluate to true while if (myBool ==
YES) will evaluate to false.
Cheers,
Chuck
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