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(span): Change to a tail-recursive form.

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This commit is contained in:
Kevin Ryde 2004-12-06 00:34:53 +00:00
parent ee0301df8c
commit 379b03074e
1 changed files with 5 additions and 6 deletions
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11
srfi/srfi-1.scm
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@ -617,12 +617,11 @@
clist))) clist)))
(define (span pred clist) (define (span pred clist)
(if (null? clist) (let lp ((clist clist) (rl '()))
(values '() '()) (if (and (not (null? clist))
(if (pred (car clist)) (pred (car clist)))
(receive (first last) (span pred (cdr clist)) (lp (cdr clist) (cons (car clist) rl))
(values (cons (car clist) first) last)) (values (reverse! rl) clist))))
(values '() clist))))
(define (span! pred list) (define (span! pred list)
(span pred list)) ; XXX:optimize (span pred list)) ; XXX:optimize