On Sep 30, 2010, at 1:28 PM, Remco Poelstra wrote: > Hi, > > I've a class that represents a general piece of hardware. Subclasses of that > class represent more specific versions of that hardware. When I scan the > network for hardware, I first only know some basic properties of the hardware > and only after some more queries I'll know all details. I thought it would be > a good thing to instantiate from the base class when I detect the hardware > and then change the class to a more specific class as I find out more about > the hardware. > But how do I change a class? I know about the ISA pointer, but changing it > doesn't allocate any additional variables. > What would be a nice solution to this problem?
Why not just allocate a new object to replace the existing one? E.g.: id hardware = [[HardWare alloc] init]; [someDictionary setObject:hardware forKey:@"newHardware"]; [hardware release]; // owned only by dict ... // now you know the specific hw properties USBHardware *usbHardWare = [[USBHardware alloc] init]; [someDictionary setObject: usbHardWare forKey:@"newHardware"]; [usbHardWare release]; HTH, Keary Suska Esoteritech, Inc. "Demystifying technology for your home or business" _______________________________________________ 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 arch...@mail-archive.com
