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22 lines
569 B
Idris
22 lines
569 B
Idris
module Data.Linear.Bifunctor
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import Data.Linear.Notation
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%default total
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||| A linear bimap on linear pairs.
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||| There is no general Bifunctor interface because it would not be implementable with
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||| The same type signature consistently, for example LEither does not consume both
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||| `f` and `g` linearly.
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public export
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bimap : (a -@ x) -@ (b -@ y) -@ (LPair a b) -@ (LPair x y)
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bimap f g (a # b) = f a # g b
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public export
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mapFst : (a -@ x) -@ LPair a b -@ LPair x b
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mapFst f = bimap f id
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public export
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mapSnd : (b -@ y) -@ LPair a b -@ LPair a y
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mapSnd = bimap id
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