Hi Iustin, yes I want to deserialize an unknown type based on the content of the file (in this example). Let's say I can reduce the spectum of types to: Strings, all the types in Enum, Ints. Is it possible?
My real problem is that on my web interface I want to use web routes to allow a user to pass an Event back to the engine. The problem is that it seems that web-routes only accepts Strings (or some known types) to be passed on the web route, whereas I need to pass random types. On Sun, Oct 21, 2012 at 8:00 PM, Iustin Pop <iu...@k1024.org> wrote: > On Sun, Oct 21, 2012 at 07:20:10PM +0200, Corentin Dupont wrote: > > Hi, > > Sorry if it was not enough explicit. > > I want to write functions like this: > > > > serialize :: (Show a) => Event a -> IO () > > deserialize :: (Read a) => IO () -> Event a > > > > The functions would write and read the data in a file, storing/retrieving > > also the type "a" I suppose... > > Can't you simply, when defining the type event, add a "deriving (Show, > Read)"? Then the standard (but slow) read/show serialisation would work > for you. > > If you're asking to de-serialise an unknown type (i.e. you don't know > what type it should restore a-priori, but you want to do that based on > the contents of the file), things become a little more complex. Unless > you can further restrict the type 'a', really complex. > > Maybe stating your actual problem, rather than the implementation > question, would be better? > > regards, > iustin >
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