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Linux Cubed Series 7: Sunsite
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test-methods.scm
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1995-10-13
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623b
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; Copyright (c) 1993, 1994 Richard Kelsey and Jonathan Rees. See file COPYING.
(define-generic g &g)
(define-method &g ((x :number)) 'win)
(define-method &g ((n :integer))
(if (= n 13)
(next-method)
'ok))
(define-method &g ((s :symbol))
(if (= s 13)
(next-method)
'ok))
; (g 1/2) => 'win
; (g 10) => 'ok
; (g 13) => 'win
(define-generic elt &elt)
(define-method &elt ((x :vector) y)
(vector-ref x y))
(define-method &elt ((x :string) y)
(string-ref x y))
(define-method &elt ((x :list) y)
(list-ref x y))
; Generic length
; (define-generic-function glength ((s :sequence)))