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weak hash table for cstructs needs ephemerons

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svn: r8353
This commit is contained in:
Matthew Flatt 2008-01-16 23:19:07 +00:00
parent 5715f7a8da
commit 74062d996f
1 changed files with 7 additions and 2 deletions
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9
collects/mzlib/foreign.ss
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@ -1477,10 +1477,15 @@
(define cstruct-info
(let ([table (make-hash-table 'weak)])
(lambda (cstruct msg/fail-thunk . args)
(cond [(eq? 'set! msg/fail-thunk) (hash-table-put! table cstruct args)]
(cond [(eq? 'set! msg/fail-thunk)
(hash-table-put! table cstruct (make-ephemeron cstruct args))]
[(and cstruct ; might get a #f if there were no slots
(hash-table-get table cstruct (lambda () #f)))
=> (lambda (xs) (apply values xs))]
=> (lambda (xs)
(let ([v (ephemeron-value xs)])
(if v
(apply values v)
(msg/fail-thunk))))]
[else (msg/fail-thunk)]))))
;; ----------------------------------------------------------------------------