From: Gavin Sinclair <gsinclair@...>
Date: 2003-01-23T01:47:26+09:00
Subject: Re: extend (Re: a single class that supports multiple facets/interfaces)

On Wednesday, January 22, 2003, 9:30:52 PM, ts wrote:

>>>>>> "D" == David Garamond <davegaramond@icqmail.com> writes:

D>> thanks. so as i see it, 'extend' is like 'include' but operates at the 
D>> object level (while 'include' usually works at the class level), right? 

>  Well, it's perhaps best if you see that #extend work at singleton level

>  For example

>    class A
>       extend M
>    end


Is

  A.extend M

a shortcut for this?  Practically it seems to be, and theoretically it
should be, since "class A" sets "self" to "A".

So is there a shortcut for

  class A
    include M
  end

?

The logic above appears to apply, but

  A.include M

fails because "private method `include' called for A:Class".


Just wondering if I've got everything right, and if there's anything
else to learn about it.

Gavin