From: Jacob Fugal <lukfugl@...>
Date: 2008-11-28T02:39:44+09:00
Subject: [ruby-core:20141] Re: Ruby class variable access from C

On Thu, Nov 27, 2008 at 9:27 AM, Christopher Thompson
<cthompson@nexopia.com> wrote:
>> On Thu, Nov 27, 2008 at 04:49:32AM +0900, Christopher Thompson wrote:
>>> I think I can get it by doing:
>>> VALUE myvar = rb_eval_string("Myclass::myvar");
>>> but surely there's a better way?  I'm thinking something like
>>> rb_cvar_get() but that requires that I pass in a VALUE and all I have is
>>> a string at this point, "Myclass".
<snip>
>
> Matz suggested rb_const_get and rb_eval_string.  rb_eval_string is what
> I'm already doing, so I'll look into rb_const_get.  But thanks, your
> approach would work for most sane extensions.  :)

To elaborate on Matz' suggestion, I'd do something like:

VALUE klass = rb_const_get("Myclass");
VALUE myvar = rb_cvar_get(klass, "myvar");

Excuse any mistake in my usage of either of those methods, I haven't
actually used them in quite some time and didn't bother looking at the
documentation. :)

Jacob Fugal