On Nov 4, 2010, at 10:09 AM, Enwin Thun wrote:
Please redirect me if this is inappropriate for this forum.
The following code appears in the tspl book.
<http://www.scheme.com/tspl3/start.html#./start:s185>
It is an "implementation of a queue use[ing] a tconc structure".
To put new elements into the end of the list, it is required that the
2 'ignored atoms are really the same.
This makes me curious about how atoms and lists are stored. I am
looking for a link that explains this in terms of memory addresses,
pointers, etc. A link for general discussion about memory management
in scheme would also be nice.
Alan set you some general references but Chicken specific information
can be found at http://wiki.call-cc.org/man/4/Data%20representation
Thanks.
(define make-queue
(lambda ()
(let ((end (cons 'ignored '())))
(cons end end))))
(define putq!
(lambda (q v)
(let ((end (cons 'ignored '())))
(set-car! (cdr q) v)
(set-cdr! (cdr q) end)
(set-cdr! q end))))
(define getq
(lambda (q)
(car (car q))))
(define delq!
(lambda (q)
(set-car! q (cdr (car q)))))
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Best Wishes,
Kon
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