monoidal-functors-0.2.0.0: src/Data/Trifunctor/Module.hs

module Data.Trifunctor.Module
  ( -- * LeftModule
    LeftModule (..),

    -- * RightModule
    RightModule (..),

    -- * Bimodule
    Bimodule,
  )
where

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class LeftModule cat t1 t2 t3 f where
  lstrength :: cat (f a b c) (f (t1 a x) (t2 b x) (t3 c x))

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class RightModule cat t1 t2 t3 f where
  rstrength :: cat (f a b c) (f (t1 x a) (t2 x b) (t3 x c))

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class (LeftModule cat t1 t2 t3 f, RightModule cat t1 t2 t3 f) => Bimodule cat t1 t2 t3 f