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pluso-i / minuso-i / *o-i / lto-i / lteo-i / neqo-i wrap host arithmetic in project. They run at native speed but require their inputs to walk to ground numbers — they are NOT relational the way Peano pluso is. Use them when puzzle size makes Peano impractical (which is most cases beyond toy examples). Composes with relational goals — for instance, (fresh (x) (membero x (1 2 3 4 5)) (lto-i x 3) (== q x)) filters the domain by < 3 and returns (1 2). 18 new tests, 287/287 cumulative.
57 lines
1.1 KiB
Plaintext
57 lines
1.1 KiB
Plaintext
;; lib/minikanren/intarith.sx — fast integer arithmetic via project.
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;;
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;; These are ground-only escapes into host arithmetic. They run at native
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;; speed (host ints) but require their arguments to walk to actual numbers
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;; — they are not relational the way `pluso` (Peano) is. Use them when
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;; the puzzle size makes Peano impractical.
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;;
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;; Naming: `-i` suffix marks "integer-only" goals.
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(define
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pluso-i
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(fn
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(a b c)
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(project
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(a b)
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(if (and (number? a) (number? b)) (== c (+ a b)) fail))))
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(define
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minuso-i
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(fn
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(a b c)
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(project
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(a b)
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(if (and (number? a) (number? b)) (== c (- a b)) fail))))
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(define
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*o-i
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(fn
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(a b c)
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(project
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(a b)
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(if (and (number? a) (number? b)) (== c (* a b)) fail))))
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(define
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lto-i
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(fn
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(a b)
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(project
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(a b)
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(if (and (number? a) (and (number? b) (< a b))) succeed fail))))
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(define
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lteo-i
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(fn
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(a b)
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(project
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(a b)
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(if (and (number? a) (and (number? b) (<= a b))) succeed fail))))
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(define
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neqo-i
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(fn
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(a b)
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(project
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(a b)
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(if (and (number? a) (and (number? b) (not (= a b)))) succeed fail))))
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