Hi! I'm translating a R6RS Scheme program to Racket, and I have a question
about the best "Racket-ese" translation for Scheme's `define-record-type'.
Consider the following R6RS definition:
-----
(define-record-type racr-specification
(fields (mutable specification-phase) rules-table (mutable start-symbol))
(opaque #t)(sealed #t)
(protocol
(lambda (new)
(lambda ()
(new 1 (make-eq-hashtable 50) racr-nil)))))
-----
What is the Racket translation of the protocol specification? Reading the
online Racket docs, I don't see how to specify a different (and fresh per
instance) value for every field within Racket's `struct` form. (#:auto and
#:auto-value are not what I want; I need different values, and fresh values,
for every created instance.)
I guess I could "cheat" by defining the "expected" constructor myself:
-----
(define (make-racr-specification)
(racr-specification 1 (make-eq-hashtable 50) racr-nil))
-----
But this seems common enough that it would be built into `struct` in some way?
Or maybe `struct` isn't what I want at all?
Thanks ---
Eric.
(a Racket newbie)
--
-------------------------------------------------------------------------------
Eric Eide <ee...@cs.utah.edu> . University of Utah School of Computing
http://www.cs.utah.edu/~eeide/ . +1 (801) 585-5512 voice, +1 (801) 581-5843 FAX
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