From: William Djaja Tjokroaminata <billtj@...>
Date: 2002-08-13T02:08:14+09:00
Subject: Re: Is There an Inverse of 'rb_define_method'?

Well, I have not digged too deep into the Ruby C source code; however, to
me the answer for the dynamic arguments should be from C variable number
of arguments.

I don't know the exact internal of Ruby, but to me, when parsing a Ruby
script, I guess the "rb_define_method" is called with argc either equal to
-1 or -2.  Therefore, if I know that all the C functions are derived like
this, there is no problem for me to call the C functions directly: if all
are -1, then the function is of the form "func (int argc, VALUE *argc,
VALUE self)", and if all are -2, then the function is of the form "func
(VALUE self, VALUE args)".

Regards,

Bill
============================================================================
nobu.nokada@softhome.net wrote:
> You know why it can't work:
>> The problem is in my case, someone else (the user) will define the method
>> in Ruby, and so I cannot record it when the method is defined.

> And also, how can you know about the arguments?

> If you will let users choose from functions you provide, you
> can hold the pointer internally.  Otherwise, it would be
> impossible in general.  C has no such dynamic feature.

> -- 
> Nobu Nakada