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
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