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Re: Will guile support R7RS terminating "equal?" in the presence of cycl


From: Ludovic Courtès
Subject: Re: Will guile support R7RS terminating "equal?" in the presence of cycle?
Date: Sat, 01 Sep 2012 15:30:26 +0200
User-agent: Gnus/5.130005 (Ma Gnus v0.5) Emacs/24.2 (gnu/linux)

Hi,

"David A. Wheeler" <address@hidden> skribis:

> *However*, the current R7RS draft for "equal?" requires termination
> even in the presence of cycles, as well as impose other requirements
> on "write" and "display" in the presence of cycles.  Will guile
> support such changes?  I worry that these new requirements on "equal?"
> will have such a high overhead that people won't do it.  But perhaps
> those fear are misplaced.

Are you talking about termination in the case of circular lists, or for
arbitrary data structures?

The former is easy and reasonably cheap, but the latter may require more
work, indeed.

Thanks,
Ludo’.




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