On Wed, Dec 21, 2011 at 12:35 PM, Kannan Goundan
I'm using the Data.Enumerator library. I'm trying to write a "map" function that converts an Enumerator of one type to another. Something like:
mapEnum :: Monad m => (a -> b) -> Enumerator a m r -> Enumerator b m r
Any hints?
(My exact use case is that I have a ByteString enumerator and I need to pass it to something that requires a Blaze.Builder enumerator.)
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You can use the Data.Enumerator.List.map function to create an Enumeratee, and then the Data.Enumerator.$= operators to join them together. Something like: mapEnum f enum = enum $= EL.map f