Luke Palmer ha scritto: > [...] > Note that it is not always possible to separate IO from pure code. > As an example, consider an HTTP 1.1 server that read a request body > containing a number for each line, and return a response body containing > the sum of the numbers. > > > What? > > sumRequest :: String -> String > -- strips header, sums numbers, returns response > > sumServer :: IO () > -- reads from socket, writes sumRequest to socket > > And many other permutations, with differing degrees of laziness and > parametericity. >
As long as you stricly read a string from the socket, this is ok. But you can not read a string lazily. Regards Manlio _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe