1.4.5 Invoking methods in the superclass

Within the body of a define-objc-method or define-objc-class-method form, the local macro current-super can be used to obtain a special object which will make invoke call the method in the superclass of the defining class. This is equivalent to using super in Objective-C.

For example, the Objective-C code:

@implementation MySpecialObject

- (unsigned int)areaOfWidth:(unsigned int)width

                height:(unsigned int)height

{

  return 4*[super areaOfWidth:width height:height];

}

@end

could be written as follows in Lisp:

(define-objc-method ("areaOfWidth:height:" (:unsigned :int))

    ((self my-special-object)

     (width (:unsigned :int))

     (height (:unsigned :int)))

  (* 4 (invoke (current-super) "areaOfWidth:height:"

                               width height)))