From: Lyle Johnson <lyle.johnson@...>
Date: 2005-01-28T02:36:38+09:00
Subject: Re: [Newbie] Extending Ruby

On Fri, 28 Jan 2005 01:56:24 +0900, Asbj�rn Reglund Thorsen
<asbjoert@ifi.uio.no> wrote:

> I am quite new to extending Ruby, and I have read the README.EXT.
> I am wondering how to translate (from the code below):
> "PyList_SetItem($result, i, PyFloat_FromDouble((double) p(i+1)));"
> Into Extending Ruby syntax.

The (roughly) equivalent code in a Ruby extension would be:

    $result = rb_ary_new2(size);
    for (int i = 0; i < size; i++)
        rb_ary_store($result, i, rb_float_new((double) p(i+1)));

Note that in Ruby you construct an Array instance with a certain
initial size by calling rb_ary_new2(size), and then you set the array
items by calling rb_ary_store(). Also, the function for constructing a
Ruby Float object from a C double is rb_float_new().

Hope this helps,

Lyle