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(;module:
lux
(lux (control [monoid #+ Monoid]
[eq #+ Eq]
hash
codec)))
## [Structures]
(struct: #export _ (Eq Bool)
(def: (= x y)
(if x
y
(not y))))
(struct: #export _ (Hash Bool)
(def: eq Eq<Bool>)
(def: (hash value)
(case value
true +1
false +0)))
(do-template [<name> <identity> <op>]
[(struct: #export <name> (Monoid Bool)
(def: identity <identity>)
(def: (compose x y)
(<op> x y)))]
[ Or@Monoid<Bool> false or]
[And@Monoid<Bool> true and]
)
(struct: #export _ (Codec Text Bool)
(def: (encode x)
(if x
"true"
"false"))
(def: (decode input)
(case input
"true" (#;Right true)
"false" (#;Right false)
_ (#;Left "Wrong syntax for Bool."))))
## [Values]
(def: #export complement
{#;doc "Generates the complement of a predicate.
That is a predicate that returns the oposite of the original predicate."}
(All [a] (-> (-> a Bool) (-> a Bool)))
(. not))
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