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Re: [Chicken-users] Including C struct definitions

From: Nicolas Pelletier
Subject: Re: [Chicken-users] Including C struct definitions
Date: 20 Dec 2004 14:16:46 +0100
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3

Joel Reymont <address@hidden> writes:

> > Nicolas Pelletier wrote:
> >SWIG is used  to provide access to C functions (a  lib or custom code)
> >to a  higher-level language,  isn't it  ? I am  trying to  achieve the
> >converse: calling from C into Scheme and exchanging structures in both
> >directions. 
> Well, what SWIG does to register your structure and access methods is
> something that you could do yourself, I think. But I see where you are
> coming from. If the structure was registered "natively" with Chicken
> then
> you won't need C access wrapper methods.


> SWIG registers a bunch of C accessor functions that take the structure/
> class pointer as an argument and get or set structure fields. Then it
> wraps the whole thing in TinyCLOS code if you ask it to.
> I think you could achieve what you are looking for by calling the SWIG-
> generated accessors from your Scheme code, whether you call that code
> from C or from Scheme shouldn't matter.

Thank you for pointing  this. The primitive accessors/mutators for the
structures' fields can  be "unhidden" (they are static  C functions by
default),   or   I  could   try   and   use   TinyCLOS,  which   gives
accessors/mutators   already,  and   would  allow   me   to  implement
structure-specific behaviour easily... Hmmm, how cute !


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