I think you would love to have a look at AwesomePrelude[1] or a fork
of AwesomePrelude using associated types[2]
Some more background information by Tom Lokhorst [3][4].
[1] http://github.com/tomlokhorst/AwesomePrelude
[2] http://github.com/urso/AwesomePrelude
[3] http://tom.lokhorst.eu/2009/09/deeply-embedded-dsls
[4] http://tom.lokhorst.eu/2010/02/awesomeprelude-presentation-video
On 28 Okt., 12:09, Dupont Corentin
Thank you for your rich responses.
Indeed I think I miss some thinks in my DSL, that would make things easier to deal with lists and first class functions. I don't really know what for now. Perhaps a List Constructor? Or a constructor on functions like yours Ryan? EAp :: Exp ref (a -> b) -> Exp ref a -> Exp ref b It's from which DSL? It is accessible on the net?
Chris suggested me that I can only define the Foldr constructor and deduce Map from it. But maybe I have to add a List constructor for that.
But in the suggestions from Ryan and Brandon I don't understand why I should add an extra type parameter and what it is!
Steffen: Wow nice. I'll integrate that ;)
I'm also looking at the Atom's DSL to get inspiration. Something I don't understand in it is that it has two languages, on typed:
data E a where VRef :: V a -> E a Const :: a -> E a Cast :: (NumE a, NumE b) => E a -> E b Add :: NumE a => E a -> E a -> E a etc.
And, along with it, an untyped counterpart:
-- | An untyped term. data UE = UVRef UV | UConst Const | UCast Type UE | UAdd UE UE etc.
What that for? What's the use of having beautiful GADT if you have to maintain an untyped ADT aside??
Corentin
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