2 import "Serialization" as Serialization
4 rt :: Serialization.IO a => a -> a
5 rt v = Serialization.readByteArray (Serialization.writeByteArray v)
7 data FooBar a = Foo Integer | Bar a
9 deriving instance (Show a) => Show (FooBar a)
10 deriving instance (Serialization.IO a) => Serialization.IO (FooBar a)
13 instance IO FooBar where
14 read s = match Serialization.read s :: Integer with
15 0 -> Foo (Serialization.read s)
16 1 -> Bar (Serialization.read s)
17 write s (Foo x) = do Serialization.write s (0 :: Integer) ; Serialization.write s x
18 write s (Bar x) = do Serialization.write s (1 :: Integer) ; Serialization.write s x
20 main = show (rt (Foo 3 :: FooBar Double))