* [bug #30071] unfold isn't tail-recursive
@ 2010-06-07 18:30 Szavai Gyula
2010-06-08 21:47 ` Ludovic Courtès
0 siblings, 1 reply; 5+ messages in thread
From: Szavai Gyula @ 2010-06-07 18:30 UTC (permalink / raw)
To: Szavai Gyula, bug-guile
URL:
<http://savannah.gnu.org/bugs/?30071>
Summary: unfold isn't tail-recursive
Project: Guile
Submitted by: szgyg
Submitted on: Mon 07 Jun 2010 06:30:34 PM GMT
Category: None
Severity: 3 - Normal
Item Group: None
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
_______________________________________________________
Details:
(use-modules (srfi srfi-1))
(write
(false-if-exception
(let ((stack (* 0.05 (cadr (member 'stack (debug-options))))))
(unfold (lambda (x) (> x stack)) identity 1+ 0)
#t)))
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?30071>
_______________________________________________
Message sent via/by Savannah
http://savannah.gnu.org/
^ permalink raw reply [flat|nested] 5+ messages in thread* [bug #30071] unfold isn't tail-recursive 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 0 siblings, 1 reply; 5+ messages in thread From: Ludovic Courtès @ 2010-06-08 21:47 UTC (permalink / raw) To: Ludovic Courtès, Szavai Gyula, bug-guile Follow-up Comment #1, bug #30071 (project guile): Hello, Doesn't the TAIL-GEN argument prevent it from being implemented in a tail-recursive fashion? (When TAIL-GEN is omitted it can be tail-recursive.) Thanks, Ludo'. _______________________________________________________ Reply to this item at: <http://savannah.gnu.org/bugs/?30071> _______________________________________________ Message sent via/by Savannah http://savannah.gnu.org/ ^ permalink raw reply [flat|nested] 5+ messages in thread
* [bug #30071] unfold isn't tail-recursive 2010-06-08 21:47 ` Ludovic Courtès @ 2010-06-10 15:57 ` Szavai Gyula 2010-06-17 13:07 ` Ludovic Courtès 0 siblings, 1 reply; 5+ messages in thread From: Szavai Gyula @ 2010-06-10 15:57 UTC (permalink / raw) To: Ludovic Courtès, Szavai Gyula, bug-guile 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)))) _______________________________________________________ Reply to this item at: <http://savannah.gnu.org/bugs/?30071> _______________________________________________ Message sent via/by Savannah http://savannah.gnu.org/ ^ permalink raw reply [flat|nested] 5+ messages in thread
* [bug #30071] unfold isn't tail-recursive 2010-06-10 15:57 ` Szavai Gyula @ 2010-06-17 13:07 ` Ludovic Courtès 2010-10-08 14:28 ` Ludovic Courtès 0 siblings, 1 reply; 5+ messages in thread From: Ludovic Courtès @ 2010-06-17 13:07 UTC (permalink / raw) To: Ludovic Courtès, Szavai Gyula, bug-guile Update of bug #30071 (project guile): Assigned to: None => civodul _______________________________________________________ Reply to this item at: <http://savannah.gnu.org/bugs/?30071> _______________________________________________ Message sent via/by Savannah http://savannah.gnu.org/ ^ permalink raw reply [flat|nested] 5+ messages in thread
* [bug #30071] unfold isn't tail-recursive 2010-06-17 13:07 ` Ludovic Courtès @ 2010-10-08 14:28 ` Ludovic Courtès 0 siblings, 0 replies; 5+ messages in thread From: Ludovic Courtès @ 2010-10-08 14:28 UTC (permalink / raw) To: Ludovic Courtès, Szavai Gyula, bug-guile Update of bug #30071 (project guile): Status: None => Fixed Open/Closed: Open => Closed _______________________________________________________ Follow-up Comment #3: Fixed along these lines: http://git.savannah.gnu.org/cgit/guile.git/commit/?id=07076c1e61ab05b62979ee01a5220edb308b0750 Thanks! Ludo'. _______________________________________________________ Reply to this item at: <http://savannah.gnu.org/bugs/?30071> _______________________________________________ Message sent via/by Savannah http://savannah.gnu.org/ ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2010-10-08 14:28 UTC | newest] Thread overview: 5+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 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 2010-06-17 13:07 ` Ludovic Courtès 2010-10-08 14:28 ` Ludovic Courtès
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).