From: Szavai Gyula <INVALID.NOREPLY@gnu.org>
To: "Ludovic Courtès" <ludo@gnu.org>,
"Szavai Gyula" <szgyg@ludens.elte.hu>,
bug-guile@gnu.org
Subject: [bug #30071] unfold isn't tail-recursive
Date: Thu, 10 Jun 2010 15:57:39 +0000 [thread overview]
Message-ID: <20100610-155738.sv74648.77461@savannah.gnu.org> (raw)
In-Reply-To: <20100608-214756.sv15145.12079@savannah.gnu.org>
Follow-up Comment #2, bug #30071 (project guile):
; I mean the simple implementation
(define* (unfold p f g s #:optional (t (lambda (x) '())))
(let loop ((s s) (a '()))
(if (p s)
(rev-append a (t s))
(loop (g s) (cons (f s) a)))))
(define (rev-append xs ys)
(if (null? xs)
ys
(rev-append (cdr xs) (cons (car xs) ys))))
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next prev parent reply other threads:[~2010-06-10 15:57 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-07 18:30 [bug #30071] unfold isn't tail-recursive Szavai Gyula
2010-06-08 21:47 ` Ludovic Courtès
2010-06-10 15:57 ` Szavai Gyula [this message]
2010-06-17 13:07 ` Ludovic Courtès
2010-10-08 14:28 ` Ludovic Courtès
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