From: ts <decoux@...>
Date: 2001-02-24T00:55:42+09:00
Subject: [ruby-talk:11389] Re: Array bugs?

>>>>> "C" == Christoph Rippel <crippel@primenet.com> writes:

C> What is the output of  ``p pl == pr''?

 true

pigeon% ruby
class UnOrderedPair
def ==(other)
        return false  unless other.kind_of?  UnOrderedPair
      return true if id == other.id
      return true if (@l == other.l ) && (@r == other.r)
      return  (@l == other.r ) && (@r == other.l)
end
def initialize(ll,rr)
          @l = ll; @r = rr
end
protected 
attr_reader    :l, :r
end
 
l = []; r=[]
 
pl = UnOrderedPair.new l,r
pr = UnOrderedPair.new r,l
 
l << pl; r << pr
 
p pl == pr
^D
true
pigeon% 


Guy Decoux