Created
May 10, 2012 13:49
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(use gauche.generator) | |
(use gauche.lazy) | |
(define-syntax chain | |
(syntax-rules () | |
[(_ lis proc ...) | |
(let loop ([p (map (lambda (p) | |
(append `(pa$) p)) | |
(list `proc ...))] | |
[l lis]) | |
(if (pair? p) | |
(loop (cdr p) ((eval (car p) (interaction-environment)) l)) | |
l))])) | |
(define (tmpgen cnt) | |
(generate | |
(lambda (yield) | |
(let loop ([i 0]) | |
(when (< i cnt) | |
(print "Generate: " i) | |
(yield i) | |
(loop (+ i 1))))))) | |
(chain (generator->lseq (tmpgen 10)) | |
(lmap (^x (* x 2)))) | |
(chain '(1 2 3 4 5) | |
(map (^x (* x 2))) | |
(map (^x (+ x 1)))) | |
;; => (3 5 7 9 11) | |
(take (chain (lrange 0) | |
(lmap (^x (* x 2)))) | |
10) | |
;; => (0 2 4 6 8 10 12 14 16 18) |
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