From: Gavin Sinclair <gsinclair@...>
Date: 2004-09-14T12:48:15+09:00
Subject: Re: traits & roles

Phil wrote:
>> Only pure-Ruby solution I can think of is to remember the modules that
>> have been mixed in, and selectively reapply earlier ones when
>> 'unextend' is called.  Pretty fugly.
>
> Perhaps, but it's probably possible.  Is there an 'extended' callback?
> if not  'extend' could be redefined.

The callback you're after is Module#append_features, from memory.  On
first thought, I doubt that's useful, because it's from each individual
module's POV.

If I were implementing this, I'd create new methods rather than modify
#entend, at least at first.  Something like:

  Object#wrap(module)
  Object#unwrap(module)

Perhaps a traits lit. review would turn up some agreeable terminology.

Cheers,
Gavin