From: "ara.t.howard" <ara.t.howard@...>
Date: 2007-05-22T07:02:42+09:00
Subject: double extend of object


does anyone know if this can be relied upon?

cfp:~ > cat a.rb
class C
   def singleton_class &b
     sc =
       class << self;
         self
       end
     b ? sc.instance_eval(&b) : sc
   end
   def extend m
     ancestors = [singleton_class.ancestors,  
self.class.ancestors].flatten.uniq
     super(ancestors.index(m) ? m.dup : m)
   end
end

module A
   def foo() 'A' end
end

module B
   def foo() 'B' end
end

c = C.new

c.extend A
p c.foo

c.extend B
p c.foo

c.extend A
p c.foo


cfp:~ > ruby a.rb
"A"
"B"
"A"


??


-a
--
we can deny everything, except that we have the possibility of being  
better. simply reflect on that.
h.h. the 14th dalai lama