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

I do something like this

@protocol MyProtocol
- (void) foo;
- (void) bar;
@end

@interface BaseAbstract
- (void) bar; // give a default implementation
@end

@interface Derived_1 : BaseAbstract
// you will get a compiler warning for foo() since it is not implemented

// you will NOT get compiler for bar() warning since a default 
// implementation is inherited
@end

@interface Derived_2 : BaseAbstract
@end

typedef BaseAbstract Base;