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Re: Gurus? Care to re-explain the absense of gh_set_x() for me?


From: tom
Subject: Re: Gurus? Care to re-explain the absense of gh_set_x() for me?
Date: 13 Jul 2001 11:03:24 -0400

well, perhaps you could write c code that reads and avluates a string
with the scheme macro. funny solution for a funny project...

tom

On 13 Jul 2001 10:24:46 -0400, Sam Tregar wrote:
> On Fri, 13 Jul 2001, Matthias Koeppe wrote:
> 
> > You should not attempt to code this as a C function.  += is not simply
> > a new procedure but needs to be a *special form* (i.e., a new syntax).
> > So I suggest you make a macro that expands (+= A B) into (SET! A (PLUS
> > A B)) and bind it to `+='.  In Scheme, this is easily done with
> > DEFINE-MACRO; if you insist in doing this from the C level, try your
> > luck with the functions in `macro.h'.  Then implement PLUS as a C
> > function that simply computes the desired value.
> 
> Let me explain more about what I'm doing.  I'm writing a Perl module
> called Inline::Guile.  One part of this project is an overloaded Perl
> object that will represent a Guile SCM.  To build an overloaded object in
> Perl you need to define functions for each of Perl's operators, +=
> included.  These operator functions can be written in Perl or in C but
> obviously not in Guile.
> 
> Does that make it clear why a macro won't suffice?
> 
> -sam
> 
> 
> 
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