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bn: Add and use new-state.

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This commit is contained in:
Sergiu Ivanov 2020-02-15 20:51:52 +01:00
parent faf8f70b2e
commit 1e931102d6
2 changed files with 7 additions and 3 deletions
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4
bn-tests.rkt
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@ -19,14 +19,14 @@
[bn (hash 'x1 f1 'x2 f2)])
(test-case "One-step syncronous update"
(let* ([s (hash 'x1 #t 'x2 #f)]
(let* ([s (new-state '((x1 . #t) (x2 . #f)))]
[new-s (update bn s '(x2 x1))])
(check-equal? (hash-ref new-s 'x1) #t)
(check-equal? (hash-ref new-s 'x2) #t)
(check-equal? (length (hash-keys new-s)) 2)))
(test-case "One-step asynchronous update"
(let* ([s (hash 'x1 #f 'x2 #f)]
(let* ([s (new-state '((x1 . #f) (x2 . #f)))]
[new-s (update bn s '(x2 x1))])
(check-equal? (hash-ref new-s 'x1) #f)
(check-equal? (hash-ref new-s 'x2) #t)

6
bn.rkt
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@ -8,7 +8,7 @@
;;; The variables to be updated at each step are given by the mode.
(provide Variable State UpdateFunc Network
update)
update new-state)
(define-type Variable Symbol)
@ -34,3 +34,7 @@
(let ([f (hash-ref bn x)])
(hash-set! new-s x (f s))))
new-s))
;;; A version of make-hash restricted to creating Boolean states.
(define (new-state [mappings : (Listof (Pairof Variable Boolean))])
(make-hash mappings))