From: "David A. Black" <dblack@...>
Date: 2004-09-15T07:48:52+09:00
Subject: Re: Modules as namespaces

[re-sending an answer that didn't seem to make it for some reason]

Hi --

On Wed, 15 Sep 2004, Sam Stephenson wrote:

> I'm trying to nest modules to create namespaces, but I'm not having
> much luck. Let's say I have
> 
> | module A
> |   module B
> |     def foo; @foo end
> |   end
> | end
> |
> | class Foo
> |   include A
> |   def initialize; @foo = 'foo' end
> |   def bar; B::foo end
> | end
> 
> Calling Foo#bar raises "NoMethodError: undefined method `foo' for
> A::B.Module".  I would like to get "foo".  What am I doing wrong?

The notation B::foo mean's B's own foo method:

  module B
    def B.foo
      puts "hi"
    end
  end

  B::foo   # hi

To get your Foo object to have the method B#foo in its path, you'd
have to include the module (A::B) in Foo, or extend your object with
it.


David

-- 
David A. Black
dblack@wobblini.net