Casting doesn't change what an object is, if your objects are As then they are
As and all your cast is doing is lying about it so the compiler allows you to
call a method without complaining, but the call will fail. If you want Bs you
need to create Bs.
> On 24 Sep, 2013, at 11:38 pm, Koen van
On Sep 24, 2013, at 12:37 PM, Kyle Sluder wrote:
> If your additional methods don't override any methods of the superclass, you
> could convert the subclass to a category. You can even add per-instance
> storage using associated objects.
Good call for the category, that should be easy to impl
On Sep 24, 2013, at 9:29 AM, Paul Scott wrote:
>> No, you should be able to cast, as the method is found dynamically at
>> run-time. Simple test program shows this.
>
> Your app does not demonstrate Koen's situation, in which he receives a set of
> ObjectA instances from the framework.
You ar
On Sep 24, 2013, at 9:29 AM, Paul Scott wrote:
> No, you should be able to cast, as the method is found dynamically at
> run-time. Simple test program shows this.
Your app does not demonstrate Koen's situation, in which he receives a set of
ObjectA instances from the framework.
--Kyle Sluder
On Sep 24, 2013, at 9:26 AM, Koen van der Drift
wrote:
>
> On Sep 24, 2013, at 11:52 AM, Kyle Sluder wrote:
>
>> No, this doesn't make sense. Casting just tells the compiler "I know better
>> than you and can guarantee you this expression is actually of this type". It
>> doesn't "convert" o
No, you should be able to cast, as the method is found dynamically at run-time.
Simple test program shows this.
I created a new project and edited the AppDelegate.h as here:
#import
@interface SYNAppDelegate : NSObject
@property (assign) IBOutlet NSWindow *window;
@end
@interface ObjectA :
On Sep 24, 2013, at 11:52 AM, Kyle Sluder wrote:
> No, this doesn't make sense. Casting just tells the compiler "I know better
> than you and can guarantee you this expression is actually of this type". It
> doesn't "convert" objects from one type to another—how would it even do that?
That's
On Sep 24, 2013, at 8:38 AM, Koen van der Drift
wrote:
> In my app I am using a 3rd party framework, and I have subclassed (objB) one
> of the classes (objA) for additional functionality.
>
> At one point I am getting an NSCountedSet from the framework with objects
> objA. When I enumerate
In my app I am using a 3rd party framework, and I have subclassed (objB) one of
the classes (objA) for additional functionality.
At one point I am getting an NSCountedSet from the framework with objects objA.
When I enumerate these, I'd like to cast them as objB, to access the
additional func
