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46 lines
927 B
Idris
46 lines
927 B
Idris
module Control.Monad.Identity
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public export
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record Identity (a : Type) where
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constructor Id
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runIdentity : a
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public export
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Functor Identity where
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map fn (Id a) = Id (fn a)
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public export
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Applicative Identity where
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pure x = Id x
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(Id f) <*> (Id g) = Id (f g)
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public export
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Monad Identity where
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(Id x) >>= k = k x
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public export
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Show a => Show (Identity a) where
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showPrec d (Id x) = showCon d "Id" $ showArg x
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public export
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Eq a => Eq (Identity a) where
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(Id x) == (Id y) = x == y
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public export
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Ord a => Ord (Identity a) where
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compare (Id x) (Id y) = compare x y
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-- public export
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-- Enum a => Enum (Identity a) where
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-- toNat (Id x) = toNat x
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-- fromNat n = Id $ fromNat n
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-- pred (Id n) = Id $ pred n
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public export
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(Semigroup a) => Semigroup (Identity a) where
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(<+>) x y = Id (runIdentity x <+> runIdentity y)
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public export
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(Monoid a) => Monoid (Identity a) where
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neutral = Id (neutral)
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