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Re: Likely a good frog project for someone with C knowledge

From: David Kastrup
Subject: Re: Likely a good frog project for someone with C knowledge
Date: Wed, 17 Aug 2011 10:23:22 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)

Bertrand Bordage <address@hidden> writes:

> 2011/8/17 David Kastrup <address@hidden>
>     Bertrand Bordage <address@hidden> writes:
>     > This would be great if Han-Wen decides to keep it like that.
>     > Otherwise there is really a lot of work, with many shortcuts to
>     > define.
>     > to_boolean (scm_is_pair (x))
>     That one would be wrong since scm_is_pair already returns a C
>     boolean.
> I was thinking about scm_pair_p ()...
> This is typically the kind of mistakes that should be solved.
> Shame on me, I won't do it again.
> Where did you find SCM_CONSP ?
> I don't see it in guile's reference. Maybe something to add to the CG
> ?

Guile reference manual for Guile 1.8, "Pair data".  It is even indexed.
What version of the Guile manual are you using?  To quote:

   Guile implements pairs by mapping the CAR and CDR of a pair directly
into the two words of the cell.

 -- Macro: int SCM_CONSP (SCM X)
     Return non-zero iff X is a Scheme pair object.

 -- Macro: int SCM_NCONSP (SCM X)
     The complement of SCM_CONSP.

David Kastrup

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