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deque-blog/dsl_arithmetic_3_cata_cps.hs

Created January 21, 2017 15:31
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dsl_arithmetic_3_cata_cps.hs
import Control.Monad.Cont
cataCps :: (Traversable f) => (f a -> a) -> Fix f -> a
cataCps algebra expr = runCont (recur algebra expr) id
recur :: (Traversable f) => (f a -> a) -> Fix f -> Cont a a
recur algebra (Fix expr) = do
sub <- sequence $ fmap (recur algebra) expr
return (algebra sub)
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