From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2012-08-16T22:11:53+09:00
Subject: Re: extending class, namespace question

On Thu, Aug 16, 2012 at 2:16 PM, Ronnie Aa <lists@ruby-forum.com> wrote:
> Hi everybody,
>
>
> I have this:
>
>
> class Fixnum
>    def times_print(str)
>       times { puts str }
>    end
> end
>
>
>
>
> module Bb
>   def self.test
>     10.times_print('foo')
>   end
> test
> end
>
> It works..
>
> But if some other .rb uses the same name for its Fixnum class extension,
> including different methods, there will be collision ??
>
>
>
> So I tried to wrap my class extension in a module like this:
>
>
> module Aa
>   class Fixnum
>     def times_print(str)
>       times { puts str }
>     end
>   end
> end
>
>
>
> module Bb
> include Aa
>   def self.test
>
>     10.times_print('foo')
>   end
> test
> end
>
> The class-extention in module Bb does not work, how do I solve this>??

When you say

module Aa
  class Fixnum

This is not the same Fixnum as the top-level Fixnum. This is
Aa::Fixnum, of which 10 is not an instance. You can refer to a
top-level constant prefixing it with "::". So:

module Aa
  class ::Fixnum

...

Jesus.