How to avoid “incomplete implementation” warning in partial base class

Question

I have created a protocol that my classes need to implement, and then factored out some common functionality into a base class, so I did this:

@protocol MyPr         


        

Answer 1

You could conceivably do something like this:

@implementation Base

- (void)bar
{
    if ([self class] == [Base class]) {
        [self doesNotRecognizeSelector:_cmd];
    }
}

@end

That way, you have an implementation, but by default it raises an exception. However, if a derived class accidentally calls [super bar] or does not override bar, then the exception won't be raised. If that's not what you want, you could just shorten it to:

@implementation Base

- (void)bar
{
    [self doesNotRecognizeSelector:_cmd];
}

@end

In which case, an exception will be raised, even if a subclass calls [super bar] or does not override bar.