3.3.4. A Simulator for Digital Circuits
Exercise 3.31

Accept-action-procedure! procedure

The internal procedure accept-action-procedure! defined in make-wire specifies that when a new action procedure is added to a wire, the procedure is immediately run. Explain why this initialization is necessary. In particular, trace through the halfadder example in the paragraphs above and say how the system's response would differ if we had defined accept accept-actionprocedure! as

(define (accept-action-procedure! proc)
  (set! action-procedures (cons proc action-procedures)))

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