Following code makes an "integerclass" with an "add" method :
#lang racket
(define (integerclass x)
(define (getx) x)
(define (setx! x_new) (set! x x_new))
(define (add y)(integerclass (+ x (y 'getx))))
(lambda (message . args)
(case message
((getx) (apply getx args))
((setx!) (apply setx! args))
((add) (apply add args))
(else (error "POINT: Unknown message ->" message)))))
(define (myprint x) (print x)(newline))
(define p1 (integerclass 1))
(myprint (p1 'getx))
(define p2 (integerclass 2))
(myprint (p2 'getx))
(define p3 (p1 'add p2))
(myprint (p3 'getx))
Question 1 : can this code be inproved, are there "better patterns" one can
you.
Question 2 : can i modify this code to use typed/racket. I tried but failed
on the "apply" method in the code.
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