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(.using
[library
[lux (.except left right)
[abstract
[equivalence (.only Equivalence)]
[hash (.only Hash)]]]])
(with_template [<name>]
[(def: .public (<name> [left right])
(All (_ left right)
(-> [left right] <name>))
<name>)]
[left]
[right]
)
... https://en.wikipedia.org/wiki/Currying
(def: .public (curried f)
(All (_ a b c)
(-> (-> [a b] c)
(-> a b c)))
(function (_ x y)
(f [x y])))
(def: .public (uncurried f)
(All (_ a b c)
(-> (-> a b c)
(-> [a b] c)))
(function (_ xy)
(let [[x y] xy]
(f x y))))
(def: .public (swapped [left right])
(All (_ left right) (-> [left right] [right left]))
[right left])
(def: .public (then f g)
(All (_ a b c d)
(-> (-> a c) (-> b d)
(-> [a b] [c d])))
(function (_ [x y])
[(f x) (g y)]))
(def: .public (forked f g)
(All (_ a l r)
(-> (-> a l) (-> a r)
(-> a [l r])))
(function (_ x)
[(f x) (g x)]))
(implementation: .public (equivalence left right)
(All (_ l r) (-> (Equivalence l) (Equivalence r) (Equivalence [l r])))
(def: (= [rl rr] [sl sr])
(and (at left = rl sl)
(at right = rr sr))))
(def: .public (hash left right)
(All (_ l r) (-> (Hash l) (Hash r) (Hash [l r])))
(implementation
(def: equivalence
(..equivalence (at left equivalence)
(at right equivalence)))
(def: (hash [leftV rightV])
("lux i64 +"
(at left hash leftV)
(at right hash rightV)))))
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