> …because you can't force an existing class to conform to a protocol without subclassing. A category can add a protocol adoption, actually.
-Ken On Wed, Oct 15, 2008 at 6:37 PM, Graham Cox <[EMAIL PROTECTED]> wrote: > > 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 > > _______________________________________________ > > Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) > > Please do not post admin requests or moderator comments to the list. > Contact the moderators at cocoa-dev-admins(at)lists.apple.com > > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/cocoa-dev/kenferry%40gmail.com > > This email sent to [EMAIL PROTECTED] > _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]