From: Baptiste Lepilleur <gaiacrtn@...>
Date: 2002-04-27T20:41:01+09:00
Subject: Re: extending ruby: defining method with default parameters value...

----- Original Message -----
From: "Joel VanderWerf" <vjoel@PATH.Berkeley.EDU>
To: "ruby-talk ML" <ruby-talk@ruby-lang.org>
Sent: Saturday, April 27, 2002 6:29 AM
Subject: Re: extending ruby: defining method with default parameters
value...


> Baptiste Lepilleur wrote:
>
> >   rb_define_method( ruby_cScintillaBase,
> >                       "sendEditorMessage",
> >                       ruby_sendEditorMessage,
> >                       3 );
> >
> >     How do I define default value for parameter 2 & 3 ? Is it even
possible
> > to do that from C ?
>
> You can use rb_scan_args. See the "Extending Ruby" chapter of the
> pickaxe book, and the README.EXT that came with your Ruby. Note that you
> have to use an arg count of -1, so that the args will be passed in a C
> array, which you pass to rb_scan_args, along with a format string.

   Now, I remember reading something about the -1 argument count. Thanks for
pointing it out!

>
> In the CGenerator library in RAA, this is made even easier. When you
> define a C function from Ruby, you specify something like

   Thanks, I'll give a look to that application. It seems to be an
interesting source of information.

  Baptiste.