Bayley, Alistair ha scritto:
From: haskell-cafe-bounces@haskell.org [mailto:haskell-cafe-bounces@haskell.org] On Behalf Of Manlio Perillo Sent: 02 March 2009 11:01
Eugene Kirpichov ha scritto:
I'm not considering the lazy IO approach, as it doesn't involve any form of control over resources. This is not always true. I'm using lazy IO, still having full control over the resources.
parse path = withFile path ReadMode parse' where parse' :: Handle -> IO (UArr Xxx) parse' handle = do contents <- L.hGetContents handle let v = toU $ xxx $ L.lines contents rnf v `seq` return v
All the file is consumed, before the result is returned.
This only works if the entire file can reasonably fit into memory.
It's not the entire file, but only the parsed data structure.
If you want to process something really big, then you need some sort of streaming approach,
Yes, this is a more general solution.
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Manlio Perillo