(goops.info.gz) Accessor

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 Accessor
 ........
 
 An "accessor" is a generic function with both reference and setter
 methods.
 
      (define-accessor perimeter)
 
 Reference methods for an accessor are defined in the same way as generic
 function methods.
 
      (define-method (perimeter (s <square>))
        (* 4 (side-length s)))
 
 Setter methods for an accessor are defined by specifying "(setter
 <accessor-name>)" as the first parameter of the `define-method' call.
 
      (define-method ((setter perimeter) (s <square>) (n <number>))
        (set! (side-length s) (/ n 4)))
 
 Once an appropriate setter method has been defined in this way, it can
 be invoked using the generalized `set!' syntax, as in:
 
      (set! (perimeter s1) 18.3)
 

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