From: Austin Ziegler <austin@...>
Date: 2003-12-06T02:41:13+09:00
Subject: Re: Attempted roadmap of future instance variables....

On Sat, 6 Dec 2003 01:40:42 +0900, Christoph wrote:
> Austin Ziegler wrote:
> ..
>> I rather agree with you on disliking the @_ form, but perhaps for
>> different reasons. In my module Transaction::Simple, I have named most
>> of the variables in the pattern @__foo__ (e.g., @__checkpoint__) so as
>> to reduce the chance of name collision. I'm not sure that I want magic
>> behaviour because of my choice to do this.
> The whole point of class local variables is to completely eliminate the
> possibility of name collision under subclassing.

That's fine for subclassing, but what about mix-ins?

class A
  def initialise
    @__checkpoint__ = True
  end
end

A.new.extend(Transaction::Simple)

We have a name collision there. Granted, the collision is there today, but I 
don't see how @_ will actually help in the case of mixins.

-austin
--
austin ziegler    * austin@halostatue.ca * Toronto, ON, Canada
software designer * pragmatic programmer * 2003.12.05
                                         * 12.35.00