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Re: [Chicken-users] Inheriting from C++ in Chicken

From: John Lenz
Subject: Re: [Chicken-users] Inheriting from C++ in Chicken
Date: Tue, 21 Dec 2004 00:08:58 +0000

On 12/20/04 03:33:20, Joel Reymont wrote:

I successfully wrapped the guichan ( library
in Chicken using SWIG wrappers. I also wrapped the SDL while I was at it.

Guichan has a base Widget class. I'd prefer to extend this class in
Scheme rather than in C++. What's the easiest way to achieve this?

It seems to me that the simplest way to accomplish this is by generating
custom C++ code , i.e. making a pass on the TinyCLOS code to generate the
wrapper C++ class.

Am I right here? Are there any examples of Scheme code parsing Scheme
code? Is the Chicken compiler code easy to adopt here or should I just do
this in a totally different manner?

SWIG supports this in other language modules, python, ruby, java. It is called directors, and is cross language polymorphism.

Check out the python section of the swig docs,
The java section has some stuff about it as well.

You can also check out some of the examples in SWIG. That is, look at Examples/python/extend

Lastly, here is a little more info, but some of it in here might be obsolete. This is the original proposal for the feature

It is on my TODO list to add something like this to chicken and guile. Most of the support in SWIG is there, just the few language specific parts need to be written.

In any case, they provide one possible way and you might want to research it.


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