Re: Comparing the Class
Re: Comparing the Class
- Subject: Re: Comparing the Class
- From: Graham Cox <email@hidden>
- Date: Thu, 16 Oct 2008 12:37:42 +1100
On 16 Oct 2008, at 12:20 am, Ruotger Skupin wrote:
Hi,
when comparing the class of two objects I usually do [obj1
isKindOfClass:[obj2 class]]. But if I say have the Class as an input
value to a method:
- (void) bla:(Class) inClass
{
if (/* inClass is an NSString */)
{
// do stuff
}
else if (/* inClass is an NSNumber */)
{
// do other stuff
}
}
Is it save to compare like this:
inClass == [NSString class]
or do I have to e.g.:
[[NSNumber numberWithInt:0] isKindOfClass:inClass]
Roddi
As well as what others have said, consider not testing the class at
all but instead testing for a response to a particular message of
interest (so-called "duck typing" - see http://en.wikipedia.org/wiki/Duck_typing)
. That can be a lot more flexible. Another option is to declare a
formal protocol that is common to the possible classes of interest,
though in the example that wouldn't work because you can't force an
existing class to conform to a protocol without subclassing.
--Graham
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