Created
November 2, 2013 14:32
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(define (discriminate f) | |
(define first? #t) | |
(define k #f) | |
(define (discriminator) | |
(define (return x) x) | |
(let ((x | |
(f (lambda (x) | |
(when first? | |
(set! first? #f) | |
(set! return (call/cc (lambda (resume) | |
(set! k resume) | |
return)))) | |
x)))) | |
;; ordering explicitly introduced so I can mutated return | |
(return x))) | |
;; remember kids, r5rs scheme does not specify left-to-right | |
;; ordering for defines, or function application. | |
(discriminator) | |
(let* ((r1 (call/cc k)) | |
(r2 (call/cc k))) | |
(eqv? r1 r2))) | |
(define (test1 get) | |
(let ((v (make-vector 2 #f))) | |
(vector-set! v 0 (get 0)) | |
(vector-set! v 1 (get 1)) | |
v)) | |
(define (test2 get) | |
(let* ((a (get 0)) | |
(b (get 1))) | |
(vector a b))) |
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