From: Christoph <swap@...> (news_chr)
Date: 2003-12-14T20:22:00+09:00
Subject: Re: append_features(mod) -- mod.kind_of? makes absolutely no sense


"T. Onoma" <transami@runbox.com> wrote in message
news:200312132339.37352.transami@runbox.com...
> First of all, if class Class inherits class Module then why isn't
> append_features defined for Class?
>
>   class Whatever
>     append_features MyModule
>   end
>   # => undefined method `append_features' for Whatever:Class
(NoMethodError)

Isn't this the whole point of Module#undef (or undef_method)?

class A
    def foo
   end
end
class B < A
    undef :foo
end

B.new.foo  #  undefined method `foo' ...

....

> Its my understanding the include passes each Module to append_features,
but
> that's not what append_features is saying. In fact, according to this
> append_features is appending Test to Test, even though it works fine.
Please,
> tell me I'm over looking the obvious here.

Don't worry, you are overlooking the obvious:-)

class Module
    alias append_features_orig append_features
    def append_features(mod)
    # changed from p mod, mod.class
      p mod, self
      append_features_orig(mod)
    end
  end
  module MyModule
    def wow
      puts "You have to be kidding!"
    end
  end
  class Test
    include MyModule
  end
  t = Test.new
  t.wow

/Christoph