On Tue, Sep 30, 2008 at 7:24 PM, dherring <[EMAIL PROTECTED]> wrote:
>
> Related question:  Is there any way to "return" side-channel data past
> intermediate frames which don't understand the protocol (i.e. no
> throwing an exception and prematurely terminating them)?

I don't know if this is sufficient for what you had in mind, but it's
pretty close:

(def side-x)
(def side-y)

(defn knows-protocol [x]
 (set! side-x x)
 (+ x 5))

(defn oblivious [x]
 (knows-protocol (+ 2 x)))

(binding [side-x nil side-y nil]
 (let [retval (oblivious 1)]
  ; now retval=8, side-x=3, side-y=nil
  (prn :retval retval)
  (prn :side-x side-x)
  (prn :side-y side-y)))

--Chouser

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