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Now, there are two local binders: let x = ... use x = ... The 'let' binder will create a local definition, type-check it, and assign a name to it. When compiled, it will create 'dup' nodes. The 'use' binder is just an alias. It will not bind a new variable, and, when compiled, will create inline copies. Also, for type-checking, it allows creating aliases that are definitionaly equal for the checker.
18 lines
567 B
Plaintext
18 lines
567 B
Plaintext
BBT.get
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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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(Maybe V)
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= λK λV λcmp λkey λmap
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use P = λx (Maybe V)
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use bin = λ_size λnext.key λnext.val λnext.lft λnext.rgt
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use P = λx
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∀(cmp: ∀(a: K) ∀(b: K) Cmp) ∀(key: K) (Maybe V)
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use ltn = λcmp λkey (BBT.get K V cmp key next.lft)
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use eql = λcmp λkey (Maybe.some V next.val)
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use gtn = λcmp λkey (BBT.get K V cmp key next.rgt)
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(~(cmp key next.key) P ltn eql gtn cmp key)
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use tip = (Maybe.none V)
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(~map P bin tip) |