Multiple Object Array Type?

Question

Whilst learning Objective-C I ran into a situation where I needed to add two different objects (one inherits from the other) to an array. Whilst it does work I was not 100% sure it was good practice?

@interface TireBasic : NSObject {
}
@end

@interface TireSnow : TireBasic {
}
@end

// To this array?
TireBasic *tires[4];

cheers -gary-

Answer 1

Looks good. Another option would be to use the id type.

Answer 2

There's nothing wrong with that. Basic polymorphism at work here.

Answer 3

Arrays are not typed in Objective-C so you can have any type of object as an array element. As to whether it is good practice or not, it depends entirely on how your planning on using the array

Answer 4

I fail to see why NSArray could not be used here. NSArray can contain multiple object types.