From: Tom Sawyer <transami@...>
Date: 2003-01-06T06:18:13+09:00
Subject: Re: executing block at toplevel from within a class

On Sunday 05 January 2003 08:01 am, nobu.nokada@softhome.net wrote:
> No.  Local variables (and constants now) are defined lexically.
> You can add methods dynamically.

thanks Nobu! that will work. refined:

  module Kernel

    def toplevel
      eval("self", TOPLEVEL_BINDING)
    end

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

    def define_singleton(meth, &block)
       metaclass_eval { define_method(meth, &block) }
    end

  end

i have added this to tomslib/rubylib (new release coming soon).

WARNING do not attempt:

	class PANIC
		def initialize
			toplevel.define_singleton(:lockup) { self }
		end
	end
	PANIC.new
	lockup

i ran something like this via an apache/mod_ruby script and my machine locked 
up. your milage may vary, but i doubt it will be good milage in any case :)

-transami