From: Robert Klemme <bob.news@...>
Date: 2005-05-11T01:35:29+09:00
Subject: Re: a class that looks like (kind_of?) several classes

Eric Mahurin wrote:
> Is there a way to make a class that looks like several classes?
>  For example:
>
> class IOArray < IO
>     include Array # doesn't work because Array is not a Module
>     # use IO methods calls to accomplish the Array methods
> end
>
> I don't need multiple inheritance.  All I want is these
> additional classes to appear in the ancestors list.  In the
> above example, IOArray could act like an IO or an Array.  It
> looks like evil.rb might have a solution, but is there a
> non-evil way?

class IOArray < IO
  def kind_of?(cl)
    Array == cl || super
  end
end

>> x=IOArray.allocate
=> #<IOArray:0x10184258>
>> x.kind_of? Array
=> true

But seriously, for what do you need that?  I can't think of an application
where I would want to make something look like an Array without being one.
Maybe it's rather Enumerable that you want?

Kind regards

    robert