From: Martin DeMello <martindemello@...>
Date: 2004-08-11T15:26:14+09:00
Subject: Re: empty? and size in Enumerable

Ara.T.Howard <ahoward@noaa.gov> wrote:
> 
> my concern would be for code that created a temporary data structure to
> iterate - the designer should re-design!  ;-)  seriously, the rbtree package
> from the raa works exactly like an ordered hash and it does not do this - i
> would say it's a serious flaw if an ordered container cannot iterate
> itself in order w/o creating temp structures - though your point is
> well taken and correct.

class Foo
  include Enumerable
  def each
    sort_by(:constantly_changing_criterion).each {|i| yield i}
  end
end

But now that I think of it, there's nothing that says such a class
couldn't override empty?

martin