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Add runEffCat (#33)

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Co-authored-by: Manuel Bärenz <m.baerenz@sonnen.de>
Co-authored-by: Marcin Szamotulski <profunctor@pm.me>
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Manuel Bärenz 2020-10-19 20:11:52 +02:00 committed by GitHub
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commit f6eb1fae64
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10
src/Control/Category/FreeEffect.hs
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@ -12,6 +12,7 @@ module Control.Category.FreeEffect
, EffCat (..)
, liftEffect
, foldNatEffCat
, runEffCat
, liftKleisli
) where
@ -89,6 +90,15 @@ foldNatEffCat
-> c a b
foldNatEffCat nat = foldNatFree2 (foldNatFree2 nat)
-- | Join all effects in a free effectful category 'EffCat'.
--
runEffCat
:: Monad m
=> EffCat m c a b
-> m (c a b)
runEffCat (Base f) = return f
runEffCat (Effect mf) = runEffCat =<< mf
-- | Functor from @(->)@ category to @'Kleisli' m@. If @m@ is 'Identity' then
-- it will respect 'effect' i.e.
-- @'liftKleisli' ('effect' ar) = 'effect' ('liftKleisli' \<$\> ar)@.