[Haskell-cafe] Re: Stream processors

MR K P SCHUPKE k.schupke at imperial.ac.uk
Thu Oct 21 12:16:52 EDT 2004

Okay, maybe I misunderstood, I thought by stream
processors you meant functions of the type:

	process :: [a] -> [a]

where both the input and the output are lazy lists (streams)

I would assume if you want to have a stateful filter you need
to maintain the state by using either:

	process :: [a] -> IO [a]
	process :: <state> -> [a] -> [a]
	process :: [a] -> ST s [a]


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