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18 lines
535 B
Plaintext
18 lines
535 B
Plaintext
BBT.has
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: ∀(K: *)
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∀(V: *)
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∀(cmp: ∀(a: K) ∀(b: K) Cmp)
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∀(key: K)
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∀(map: (BBT K V))
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Bool
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= λK λV λcmp λkey λmap
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let P = λx Bool
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let bin = λnext.size λnext.key λnext.val λnext.lft λnext.rgt
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let P = λx ∀(cmp: ∀(a: K) ∀(b: K) Cmp) ∀(key: K) Bool
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let ltn = λcmp λkey (BBT.has K V cmp key next.lft)
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let eql = λcmp λkey Bool.true
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let gtn = λcmp λkey (BBT.has K V cmp key next.rgt)
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((~(cmp key next.key) P ltn eql gtn) cmp key)
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let tip = Bool.false
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(~map P bin tip)
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