From: Robert Dober <robert.dober@...>
Date: 2008-11-16T00:06:04+09:00
Subject: Re: Class.new and class keyword not the same?

On Fri, Nov 14, 2008 at 5:09 PM, Trans <transfire@gmail.com> wrote:
> Here the normal scenario:
>
>  class X
>    def self.inherited(s)
>      p "here"
>    end
>  end
>
>  class Z < X
>    p "race"
>  end
>
> result:
>
>  "here"
>  "race"
>
> But in a test case of mine I need the class to be a variable, but:
>
>  z = Class.new(X) do
>    p "race"
>  end
>
> result:
>
>  "race"
>  "here"
>
> Why is "race" coming before "here"?
>
> ruby 1.8.6 (2007-09-24 patchlevel 111) [x86_64-linux]
>
> T.
>
>

Strange, it is "fixed" in 1.9 (though I have an old version ruby 1.9.0
(2008-06-20 revision 17482) [i486-linux]
). But  but then Jruby behaves like 1.8, maybe this is defined somewhere?
If we look at the warning below it really seems like a bug, 'cause the
old method is *not* discarded.

516/16 > cat xxx.rb && ruby1.9 -v xxx.rb && ruby -v xxx.rb && jruby -v xxx.rb
class X
  def self.inherited(x);
    x.send :define_method, :a do puts 42 end
  end
end
class Y < X
  def a; puts "21*2" end
end
Y::new.a
puts "-"*72
Class::new Y do
  def a; puts "222.to_i(4)" end
end::new.a
ruby 1.9.0 (2008-06-20 revision 17482) [i486-linux]
xxx.rb:11: warning: method redefined; discarding old a
21*2
------------------------------------------------------------------------
xxx.rb:16: warning: method redefined; discarding old a
222.to_i(4)
ruby 1.8.7 (2008-08-11 patchlevel 72) [i686-linux]
xxx.rb:11: warning: method redefined; discarding old a
21*2
------------------------------------------------------------------------
42
ruby 1.8.6 (2008-05-30 rev 6360) [i386-jruby1.1]
21*2
------------------------------------------------------------------------
42

Any views on this?

Cheers
Robert