From: William Djaja Tjokroaminata <billtj@...>
Date: 2002-10-24T23:43:19+09:00
Subject: Re: On Using Data_Wrap_Struct

Tim Hunter <cyclists@nc.rr.com> wrote:

> ruby_bar = rb_funcall(Class_Bar, rb_intern("new"), 2,
>                       INT2FIX(c_bar.n), rb_str_new2(c_bar.msg));

> On Thu, 24 Oct 2002 05:23:27 +0900, Mark Probert wrote:

>>    f = Foo.new
>>    f.run   # --> runs and adds Bars to @arr
>>    f.arr.each { |bar| puts "#{bar.n} --> #{bar.msg}" }
>> 
>> I think that I need to use Data_Wrap_Struct, however
>> I am not sure.

Hi Mark,

It depends on what you actually want to do.  With the given example code
structure, the coupling is not bi-directional, i.e., when you have 
something like this in Ruby

     bar.msg = 'a new string'

then the corresponding C's cbar.msg is not automatically modified.  If you
want automatic coupling from Ruby to C, then you need Data_Wrap_Struct.

Regards,

Bill