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@ -1,5 +1,5 @@
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#lang debug racket
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(require racket/generator graph)
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(require racket/generator graph racket/set)
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(provide (except-out (all-defined-out) define/contract))
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(define-syntax-rule (define/contract EXPR CONTRACT . BODY)
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@ -78,7 +78,7 @@
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(define/contract (make-var name [vals null])
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((name?) ((listof any/c)) . ->* . var?)
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(var name vals))
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(var name (list->set vals)))
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(define/contract (add-vars! prob names [vals-or-procedure empty])
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((csp? (listof name?)) ((or/c (listof any/c) procedure?)) . ->* . void?)
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@ -275,7 +275,7 @@
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(define/contract (domain-length var)
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(var? . -> . natural?)
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(length (domain var)))
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(set-count (domain var)))
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(define/contract (state-count csp)
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(csp? . -> . natural?)
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@ -384,7 +384,7 @@
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[constraints
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(define ref-val (first (find-domain prob ref-name)))
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(define new-vals
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(for/list ([val (in-list vals)]
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(for/set ([val (in-set vals)]
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#:when (for/and ([const (in-list constraints)])
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(match const
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[(constraint (list (== name eq?) _) proc) (proc val ref-val)]
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@ -414,7 +414,7 @@
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(when-debug (set! nfchecks (+ (length checked-vars) nchecks)))
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;; conflict-set will be empty if there are no empty domains (as we would hope)
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(define conflict-set (for/list ([cvr (in-list checked-vars)]
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#:when (empty? (domain cvr)))
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#:when (set-empty? (domain cvr)))
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(history cvr)))
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;; for conflict-directed backjumping it's essential to forward-check ALL vars
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;; (even after an empty domain is generated) and combine their conflicts
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@ -511,7 +511,8 @@
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(eq? name (car rec))))))))
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(for/fold ([conflicts null]
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#:result (void))
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([val (in-list (order-domain-values domain))])
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([val #;(in-list (order-domain-values domain))
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(in-set domain)])
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(with-handlers ([wants-backtrack?
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(λ (bt)
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(define bths (backtrack-histories bt))
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