scsh-0.5/misc/test-doodl.scm

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1995-10-13 23:34:21 -04:00
; Copyright (c) 1993, 1994 Richard Kelsey and Jonathan Rees. See file COPYING.
; ((method () 1)) => 1
; ((method () 1) 2) => error
; ((method (x) 1) 2) => 1
; ((method ((x <symbol>)) 1) 2) => error
; ((method ((x <symbol>)) 1) 'foo) => 1
; ((method ((x <symbol>)) (next-method)) 'foo) => error
(define-generic-function elt ((s <sequence>)))
(define-method elt ((x <vector>) y)
(vector-ref x y))
; (elt '#(a b c) 1) => b
(define-method elt ((x <string>) y)
(string-ref x y))
(define-method elt ((x <list>) y)
(list-ref x y))
; Setters
(define-generic-function (setter elt)
(thing index new-value))
(define-method (setter elt) ((x <vector>) i z)
(vector-set! x i z))
; (let ((v (vector 1 2 3))) (set (elt v 1) 'foo) v) => '#(1 foo 3)
; Classes
(define-class <mumble> () a b)
; (a (make <mumble>)) => '*uninitialized*
; (let ((m (make <mumble>))) (set (a m) 'foo) (a m)) => 'foo
(define-method initialize ((m <mumble>) z)
(set (a m) z))
; (a (make <mumble> 3)) => 3