From: Robert Dober <robert.dober@...>
Date: 2008-12-14T19:55:45+09:00
Subject: Re: singleton methods vs. meta instance methods

On Sat, Dec 13, 2008 at 10:50 PM, Brian Candler <b.candler@pobox.com> wrote:
> Robert Dober wrote:
>> I could however not see the difference between A and Object, can you
>> explain please?
>
> The OP used an *instance* of class Object, not Object itself, and
> compared it with class A, which is an instance of class Class.
Brian I referred to exactly the same thing you do in your next post,
just do a %s/Object/String/g.
I did see his first point, although he did not give an example for the
inconsistency.
Confusing is it not ;)
>
> Perhaps it's clearer if written thus:
>
> obj = Object.new
> obj_meta = (class << obj;self;end)
> def obj.foobar; end
> p obj.singleton_methods            #=> ["foobar"]
> p obj_meta.instance_methods(false) #=> ["foobar"]
>
> a = Class.new
> a_meta = (class << a;self;end)
> def a.foobar; end
> p a.singleton_methods            #=> ["foobar"]
> p a_meta.instance_methods(false) #=> ["allocate", "superclass",
> "foobar", "new"]
No really I feel up to here we are just fine, the problem starts when
we define something in the metaclass and
see it in the singleton class, thus we can ask ourself how is it
possible that we have the difference you showed in the last two lines.
>
> --
> Posted via http://www.ruby-forum.com/.
>
>



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