From: "noah.easterly@..." <noah.easterly@...>
Date: 2006-08-29T04:25:18+09:00
Subject: Re: Partial append_features?

Hmmmm... maybe you could do some of this with Forwardable [1], at least
for class instantiations.  This isn't a perfect fit, since you do need
to specify the delegate object, though.

[1]: http://www.ruby-doc.org/stdlib/libdoc/forwardable/rdoc/index.html

Ola Bini wrote:
> Hi,
>
> I'm looking for a way to copy methods from a Module, or specify more
> directly which methods get included in a class. More or less, I would
> like to be able to do something like this:
>
> module Foo
>    def do_one_thing
>    end
>    def do_second
>    end
>    def do_third
>    end
> end
>
> class Bar
>    append_from Foo, :do_second, :do_third
> end
>
> or
> module Baz
>    append_from Foo, :do_second, :do_third
> end
>
> and I would have a module Baz which could be included, without having
> do_one_thing included.
>
> Is this possible in Ruby right now? My first approach was to get the
> UnboundMethod instance_method from the Module, but I couldn't find a way
> to attach these to an unrelated class since UnboundMethod must have a
> is_a?-relationship with the binding object.
>
> Regards
> --
>   Ola Bini (http://ola-bini.blogspot.com)
>   JvYAML, RbYAML, JRuby and Jatha contributor
>   System Developer, Karolinska Institutet (http://www.ki.se)
>   OLogix Consulting (http://www.ologix.com)
> 
>   "Yields falsehood when quined" yields falsehood when quined.