From: nobu.nokada@...
Date: 2002-09-05T09:14:25+09:00
Subject: Re: Is It Possible to Create Block from within C?

Hi,

At Thu, 5 Sep 2002 03:24:57 +0900,
William Djaja Tjokroaminata wrote:
> I have the following Ruby code:
> 
>     obj.func() do |arg|
>         statements
>     end
> 
> How can I translate this into the corresponding C code?  Basically the
> function func() takes a block and it has been written in C without any
> problem and it already works with Ruby scripts.  Is it simply
> impossible to create a Ruby block from within C, just as it is impossible
> to get function pointers of the Ruby methods (as they are stored as
> nodes)?

To call a method with block:

    static VALUE
    statements(VALUE arg, VALUE val)
    {
        return block_result;
    }

    static VALUE
    call_func(VALUE obj)
    {
        return rb_funcall(obj, rb_intern("func"), 0);
    }

    rb_iterate(call_func, obj, statement, 0);

-- 
Nobu Nakada