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26 lines
609 B
Idris
26 lines
609 B
Idris
module Implementation
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import Data.String
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data OneTwoThree a
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= One a
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| Two a a
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| Three a a a
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[OTT] Functor OneTwoThree where
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map f = \case
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One x => One (f x)
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Two x y => Two (f x) (f y)
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Three x y z => Three (f x) (f y) (f z)
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Show a => Show (OneTwoThree a) where
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show (One x) = "One " ++ show x
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show (Two x y) = unwords ["Two", show x, show y]
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show (Three x y z) = unwords ["Three", show x, show y, show z]
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Eq a => Eq (OneTwoThree a) where
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One a == One x = a == x
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Two a b == Two x y = a == x && b == y
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Three a b c == Three x y z = a == x && b == y && c == z
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_ == _ = False
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