From: Sam Roberts <vieuxtech@...>
Date: 2008-05-07T14:48:34+09:00
Subject: Re: delegation question, where I want prototype style delegation

On Tue, May 6, 2008 at 7:25 AM, ara.t.howard <ara.t.howard@gmail.com> wrote:

Ara, thanks for the suggestion. It suffers from the same
non-stackability problem:

p ((a/Reverse)/Reverse).each{}
=> [4,2]

However, the combination of this and James' suggestion made me think
maybe I should be cloning my src object, and then modifying it.
clone() will get the singleton class, but won't do a deep copy, so it
will still share most of the internal state of the original class. I
think this will work for me:

Classes defined as in my original, but do the extending like:

o = Base.new(1..3)
n = o.clone.extend Negate.dup
an = n.clone.extend Add.dup
nan = an.clone.extend Negate.dup

puts o.show
puts n.show
puts an.show
puts nan.show


% ruby m.rb
show: 1,2,3,
show: -1,-2,-3,
show: 9,8,7,
show: -9,-8,-7,