From: Robert Dober <robert.dober@...>
Date: 2008-11-01T02:59:43+09:00
Subject: Re: How to access to local variables in enclosing scopes?

Ruby, in it's infinite wisdom; gives you a cake that you can have and eat.

x =  42
def a; x end # does not work!!
Why?
Because it is efficient, there is no closure and that means one
context less to look up at runtime.

If however you want the closure (as I often do) you can still do it

x = 42

class << self; self end.module_eval do
  define_method :a do x end
  define_method :a= do |new_x| x = new_x end
end

puts a
a = 43
puts a
#! The next one is important !
puts x

Note the class << self; self end.module_eval
but I guess you know why I am doing this...

... class << self
 end

does not create a closure.

HTH
Robert



-- 
C'est véritablement utile puisque c'est joli.

Antoine de Saint Exupéry