* [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)))
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* [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'.
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* [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))))
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* [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
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* [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'.
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end of thread, other threads:[~2010-10-08 14:28 UTC | newest]
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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
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