From: Carlos <angus@...>
Date: 2005-04-25T12:28:43+09:00
Subject: Re: Strange behavior with SimpleDelegator and its Idioclass

[Trans <transfire@gmail.com>, 2005-04-25 04.54 CEST]
> Perhaps I should point out that the strange thing about this is that
> when the #bracket method in SD is NOT defined, then the module included
> in the idioclass (singleton) is not called as one would expect it to
> be. But when you add #bracket into SD, it "suddenly" works as it
> should, and subsequently by passes the #bracket method just defined!

Ok... another try to explanation. I think I know what part of information
you were missing.

1.
class C
    include M
    def x
    end
end

If M defines x, C#x will not be overriden, ok? You oversaw this, I think.

2.
class X; def b; puts "x.b"; end

class SD < SimpleDelegator
    def initialize
        super      # here self.b is defined to forward to X#b (1)
        (class<<self;self;end).class_eval{include M}
                   # doesn't matter if M defines #b,
                   # self.b is already defined and won't be
                   # overriden (2). self.b forwards to X#b.
    end

    # def b
    #     puts "sd.b"
    # end

# but if you uncomment the lines above, (1) doesn't happen (see my previous
# message), so (2) do add #b to the singleton class, and since methods are
# first searched in the singleton class, this #b will be called instead of
# SD#b.
end

Good luck.