Re: How to identify a potential memory leak in guile programs?

[Hengqing Hu]

After make it iterative, the fault disappears.
Many thanks to the help!

 (define (enumerate-interval low high)
-  (if (> low high)
-    nil
-    (cons low (enumerate-interval (+ low 1) high))))
+  (let loop ((i high)
+             (interval nil))
+    (if (< i low)
+      interval
+      (loop (- i 1) (cons i interval)))))


On Tue, Jan 22, 2013 at 7:14 PM, Thien-Thi Nguyen <address@hidden> wrote:
> () Hengqing Hu <address@hidden>
> () Tue, 22 Jan 2013 16:51:04 +0800
>
>    Can somebody help to look into the code and tell me what's wrong?
>
> I don't know if this is the only problem, but certainly it contributes.
> The proc ‘enumerate-interval’ consumes stack unnnecessarily.
>
>  guile> (enumerate-interval 3 500)
>  ERROR: Stack overflow
>  ABORT: (stack-overflow)
>
> Here is another implementation that doesn't have that problem.
>
>  (define (enumerate-interval low high)
>    (map (lambda (i)
>           (+ i low))
>         (iota (- high low -1))))
>
> --
> Thien-Thi Nguyen ..................................... GPG key: 4C807502
> .                  NB: ttn at glug dot org is not me                   .
> .                 (and has not been since 2007 or so)                  .
> .                        ACCEPT NO SUBSTITUTES                         .
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-- 
Best Regards, Hengqing Hu