From: Nobuyoshi Nakada <nobu@...>
Date: 2008-09-01T10:16:45+09:00
Subject: [ruby-core:18430] Re: how to create a block with a block parameter in C?

Hi,

At Thu, 28 Aug 2008 05:30:07 +0900,
Paul Brannan wrote in [ruby-core:18404]:
> > Why don't you use rb_define_method() instead of calling "define_method"?
> > 
> > "define_method" is desgined for "ruby level", not for C level.
> 
> IIRC because rb_define_method takes a function pointer, not a Ruby
> block or Proc.

Although I can't get your point, but this would equal to your
example.

$ cat foo.c
#include "ruby.h"

VALUE foo(int argc, VALUE *argv, VALUE self)
{
    VALUE x, b;
    rb_scan_args(argc, argv, "01&", &x, &b);
    rb_p(x);
    rb_p(b);
    return Qnil;
}

void Init_foo()
{
    VALUE cFoo = rb_define_class("Foo", rb_cObject);
    rb_define_method(cFoo, "foo", foo, -1);
}

$ ruby -r./foo -e 'Foo.new.foo(42) { 8 }'
42
#<Proc:0xb7cdbcf4@-e:1>

-- 
Nobu Nakada