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Re: Gurus? Care to re-explain the absense of gh_set_x() for me?
From: |
Sam Tregar |
Subject: |
Re: Gurus? Care to re-explain the absense of gh_set_x() for me? |
Date: |
Fri, 13 Jul 2001 10:24:46 -0400 (EDT) |
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
- Re: Gurus? Care to re-explain the absense of gh_set_x() for me?, (continued)
- Re: Gurus? Care to re-explain the absense of gh_set_x() for me?, Sam Tregar, 2001/07/13
- Re: Gurus? Care to re-explain the absense of gh_set_x() for me?, Eric E Moore, 2001/07/13
- Re: Gurus? Care to re-explain the absense of gh_set_x() for me?, Rob Browning, 2001/07/13
- Re: Gurus? Care to re-explain the absense of gh_set_x() for me?, Miroslav Silovic, 2001/07/15
- Re: Gurus? Care to re-explain the absense of gh_set_x() for me?, Rob Browning, 2001/07/16
- Re: Gurus? Care to re-explain the absense of gh_set_x() for me?, Neil Jerram, 2001/07/14
- Re: Gurus? Care to re-explain the absense of gh_set_x() for me?, Miroslav Silovic, 2001/07/15
- Re: Gurus? Care to re-explain the absense of gh_set_x() for me?, Neil Jerram, 2001/07/16
- Re: Gurus? Care to re-explain the absense of gh_set_x() for me?, Miroslav Silovic, 2001/07/15
- Re: Gurus? Care to re-explain the absense of gh_set_x() for me?, Matthias Koeppe, 2001/07/13
- Re: Gurus? Care to re-explain the absense of gh_set_x() for me?,
Sam Tregar <=
- Re: Gurus? Care to re-explain the absense of gh_set_x() for me?, Brett Viren, 2001/07/13
- Re: Gurus? Care to re-explain the absense of gh_set_x() for me?, Sam Tregar, 2001/07/13
- Re: Gurus? Care to re-explain the absense of gh_set_x() for me?, tom, 2001/07/13
- Re: Gurus? Care to re-explain the absense of gh_set_x() for me?, Matthias Koeppe, 2001/07/13
- Re: Gurus? Care to re-explain the absense of gh_set_x() for me?, Sam Tregar, 2001/07/13
- Re: Gurus? Care to re-explain the absense of gh_set_x() for me?, Matthias Koeppe, 2001/07/13
- Re: Gurus? Care to re-explain the absense of gh_set_x() for me?, Sam Tregar, 2001/07/13
- Re: Gurus? Care to re-explain the absense of gh_set_x() for me?, Klaus Schilling, 2001/07/13
- Re: Gurus? Care to re-explain the absense of gh_set_x() for me?, Alex Shinn, 2001/07/13
- Re: Gurus? Care to re-explain the absense of gh_set_x() for me?, rm, 2001/07/14