Created
February 1, 2018 10:14
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Haskell category
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| {-# LANGUAGE KindSignatures #-} | |
| {-# LANGUAGE PolyKinds #-} | |
| {-# LANGUAGE UnicodeSyntax #-} | |
| module Category where | |
| class Category (c :: k -> k -> *) where | |
| id :: c x x | |
| (.) :: c y z -> c x y -> c x z | |
| instance Category (->) where | |
| id = Prelude.id | |
| f . g = f Prelude.. g |
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