From: "Asbjørn Reglund Thorsen" <asbjoert@...>
Date: 2005-01-28T02:41:43+09:00
Subject: Re: [Newbie] Extending Ruby

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Thank you Lyle !! It really helps. :-)
Think I am getting the hang of it now.

On Thu, 27 Jan 2005, Lyle Johnson wrote:

> On Fri, 28 Jan 2005 01:56:24 +0900, Asbj=F8rn 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:
>
>    $result =3D rb_ary_new2(size);
>    for (int i =3D 0; i < size; i++)
>        rb_ary_store($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
>
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