From: nobu.nokada@...
Date: 2003-01-06T00:01:31+09:00
Subject: Re: executing block at toplevel from within a class

Hi,

At Sun, 5 Jan 2003 22:41:57 +0900,
Tom Sawyer wrote:
> > > a = AnyOld.new
> > > puts goneup
> > >
> > > reports goneup dosen't exist. where did it go? mind you i'm running this
> > > from with in an rhtml eruby script.
> >
> > puts eval("goneup")
> 
> that's odd. can get to it through eval but not otherwise? ugh, so is there no 
> way to dynamically define a toplevel local variable? that's basically what 
> i'm trying to do.

No.  Local variables (and constants now) are defined lexically.
You can add methods dynamically.

  module Kernel
    def metaclass_eval(&block)
      (class << self; self; end).class_eval(&block)
    end
  end

  class AnyOther
  end

  class AnyOld
    def initialize
      goingup = AnyOther.new
      eval("self", TOPLEVEL_BINDING).metaclass_eval do
        define_method(:goneup, proc {goingup})
      end
    end
  end

  a = AnyOld.new
  puts goneup

-- 
Nobu Nakada