From: "David A. Black" <dblack@...>
Date: 2009-09-13T21:54:53+09:00
Subject: Re: All the core function are buit-in?

Hi --

On Sun, 13 Sep 2009, Free Kickr wrote:

> Thanks, I download the files and have a brief read of the 4 files:
>
> enum.c
> lib/set.rb
> lib/soap/property.rb
> ext/enumerator/enumerator.c
>
> Which was told related to Enumerable module, but from those, I still did
> not understand the how the iterator implementation such as "collect,
> select, inject...etc".
>
> In my imagination, I thought, there's Enumerable.rb which include the
> method
> def select...
> def collect...
> ...
>
> But it seems I was wrong, Could you pls give a little bit explaination?

Usually toward the end of the C files there's a section where the C
functions are bound to Ruby methods, like this:

     rb_define_method(rb_mEnumerable,"sort", enum_sort, 0);
     rb_define_method(rb_mEnumerable,"sort_by", enum_sort_by, 0);
     rb_define_method(rb_mEnumerable,"grep", enum_grep, 1);
     rb_define_method(rb_mEnumerable,"find", enum_find, -1);

etc. That's your mapping from C to Ruby.


David

-- 
David A. Black, Director
Ruby Power and Light, LLC (http://www.rubypal.com)
Ruby/Rails training, consulting, mentoring, code review
Book: The Well-Grounded Rubyist (http://www.manning.com/black2)