From: Harry Ohlsen <harryo@...>
Date: 2002-10-12T06:39:33+09:00
Subject: Re: Polymorphism, Isomorphism

On Sat, 12 Oct 2002 07:27, Harry Ohlsen wrote:

> What I'd prefer is to be able to say
>
>    Runnable = [:run]
>
>    def fred(a)
>       raise "Unusable 'a' parameter" unless a.implements? Runnable
>    end
>
> since I would think of interface specifications as being logically similar
> to classes, as in Java (hence the capitalisation).  However, that didn't
> work, either.

Whoops!  I take that back !!

It was just a typo ... I forgot to change the names in the sub-array, so I had 
"InterfaceGHI = [interfaceGH, interfaceHI]" and I misread the error message.

So, the example above should work fine, which makes me happy :-).

H.