From: Daniel Berger <djberg96@...>
Date: 2006-12-05T07:00:04+09:00
Subject: Re: Swig, Ruby, C++ question


Jan Svitok wrote:
> On 12/4/06, Daniel Berger <djberg96@gmail.com> wrote:
> > Hi all,
> >
> > Solaris 10
> > swig 1.3.21
> > Sun Studio 11
> >
> > I'm trying my hand at SWIG here.  I've read over
> > http://www.swig.org/Doc1.3/Ruby.html, but I'm confused as to how to
> > setup the interface file so that I get a class.  I don't want a
> > module, if possible.

<snip>

> You need to include the header in the interface file. In fact, you
> need to include it twice: once for SWIG to parse it and create the
> wrapper .c/.cxx/.cpp file, and second time in the wrapper itself to be
> compilable.
>
> /* first time for swig */
> %include polygon.h

This works, thanks!

> /* second time for c compiler */
> %{
> #include "polygon.h"
> %}

If this is supposed to generate a '#include "polygon.h"' entry within
the .cxx file, it doesn't seem to work.  I can stuff it in there
manually easily enough, but I'd like to know what I'm doing wrong.

> you can replace these two with (in the latest version at least, so YMMV)
>
> %inline %{
> #include "polygon.h"
> %}

I had no luck with this either.  It didn't cause an error, it just
didn't seem to do anything.

> A single #include might be enough. Try and if not, use the above form.
>
> If the .i file is not too much complicated, you can merge it with the
> h file by enclosing SWIG specifics in #ifdef SWIG, e.g.
> // polygon.h
> #ifdef SWIG
> %module polygon
> #endif

The .h file I ultimately want to wrap is not under my control, so this
won't be an option.

Regards,

Dan