Question

I cannot compile my because of this error in my header:

error: expected identifier [1]

-(void) removeAllEntitiesOfClass:(Class)class;

with the caret pointing to the lowercase class.

Removing this function makes it compile again.

My class is a subclass of NSObject, which has public methods that use Class, so I thought this would automagically be declared.

I also tried changing Class to Class* and forward declaring with @Class Class, and this doesn’t work – it says it is a redefinition because I am changing the type. Apparently Class is a typedef’d struct pointer. I’m not sure how to forward declare that here, and I seem to recall it can be nasty business to forward declare a pointer typedef. Please correct me if I’m wrong, and tell me what file to import or how to forward declare.

@interface GameState : NSObject {   
...
}
...
-(void) removeAllEntitiesOfClass:(Class)class;   
@end                                             

Answer 1

I suspect your header is visible in an Objective-C++ translation. In C++, class is a keyword. To fix this, change the parameter’s name from class to some non-keyword.