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(.module:
{#.doc "Functionality for working with tuples (particularly 2-tuples)."}
[lux #*
[abstract
[equivalence (#+ Equivalence)]]])
(template [<name> <type> <output>]
[(def: #export (<name> xy)
(All [a b] (-> [a b] <type>))
(let [[x y] xy]
<output>))]
[left a x]
[right b y])
(def: #export (curry f)
(All [a b c]
(-> (-> [a b] c)
(-> a b c)))
(function (_ x y)
(f [x y])))
(def: #export (uncurry f)
(All [a b c]
(-> (-> a b c) (-> [a b] c)))
(function (_ xy)
(let [[x y] xy]
(f x y))))
(def: #export (swap xy)
(All [a b] (-> [a b] [b a]))
(let [[x y] xy]
[y x]))
(def: #export (both f g)
(All [a b c d]
(-> (-> a c) (-> b d)
(-> [a b] [c d])))
(function (_ [x y])
[(f x) (g y)]))
(def: #export (fork f g)
(All [a l r]
(-> (-> a l) (-> a r)
(-> a [l r])))
(function (_ x)
[(f x) (g x)]))
(structure: #export (equivalence l@= r@=)
(All [l r]
(-> (Equivalence l) (Equivalence r)
(Equivalence [l r])))
(def: (= [lP rP] [lS rS])
(and (l@= lP lS)
(r@= rP rS))))
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