From: "Ara.T.Howard" <Ara.T.Howard@...>
Date: 2005-09-20T01:21:37+09:00
Subject: Re: help with tricky proc/binding issue

On Tue, 20 Sep 2005, Robert Klemme wrote:

> Hacky but nice!  For thread safety how about:
<snip>


what i think to be the final version:

   class Object
     def evaluate(*a, &b)
       ret, sent = nil
       loop do
         m = "____evaluate____#{ Thread::current.object_id }____#{ rand 666 }____#{ rand 42 }____"
         klass = Class === self ? self : self::class
         begin
           klass.module_eval{ define_method m, &b }
           ret = send(sent = m, *a)
         ensure
           begin
             klass.module_eval{ remove_method m }
           ensure
             break if sent
           end
         end
       end
       ret
     end
   end

   class C
     def y
       42
     end
   end

   b = lambda{|x| p [x, y, self]}

   c = C::new
   x = 42
   c.evaluate(x, &b)  #=> [42, 42, #<C:0xb7f2f5c0>]


-a
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