objective c - Give warning when [super method] is not called

Question

When not using ARC, you get a warning when not calling [super dealloc] in your dealloc method.

I'm trying to implement something similar with a class that gets subclassed often to warn the person implementing the subclass when they don't call super.

Any ideas?

Answer 1

Recent versions of llvm have added an attribute that indicates that subclasses must call super:

@interface Barn:NSObject
- (void)openDoor NS_REQUIRES_SUPER;
@end

@implementation Barn
- (void) openDoor
{
    ;
}
@end

@interface HorseBarn:Barn
@end
@implementation HorseBarn
- (void) openDoor
{
    ;
}
@end

Compiling the above produces the warning:

Method possibly missing a [super openDoor] call