Looking for examples of "real" uses of continuations
- by Sébastien RoccaSerra
I'm trying to grasp the concept of continuations and I found several small teaching examples like this one from the Wikipedia article:
(define the-continuation #f)
(define (test)
(let ((i 0))
; call/cc calls its first function argument, passing
; a continuation variable representing this point in
; the program as the argument to that function.
;
; In this case, the function argument assigns that
; continuation to the variable the-continuation.
;
(call/cc (lambda (k) (set! the-continuation k)))
;
; The next time the-continuation is called, we start here.
(set! i (+ i 1))
i))
I understand what this little function does, but I can't see any obvious application of it. While I don't expect to use continuations all over my code anytime soon, I wish I knew a few cases where they can be appropriate.
So I'm looking for more explicitely usefull code samples of what continuations can offer me as a programmer.
Cheers!
