Re: [Haskell-cafe] Announcing OneTuple-0.1.0

Let me pick one example. Let's make a class that can convert between tuples and lists. Of course there are restriction when this works, but it can still be useful. class TupleList t l | t -> l where tupleToList :: t -> l listToTuple :: l -> t instance TupleList () [a] where tupleToList () = [] listToTuple [] = () -- XXX This doesn't work, and is just wrong. --instance TupleList (a) [a] where -- tupleToList (a) = [a] -- listToTuple [a] = (a) instance TupleList (a,a) [a] where tupleToList (a1,a2) = [a1, a2] listToTuple [a1,a2] = (a1, a2) instance TupleList (a,a,a) [a] where tupleToList (a1,a2,a3) = [a1, a2, a3] listToTuple [a1,a2,a3] = (a1, a2, a3) On Fri, Oct 3, 2008 at 8:17 AM, Jason Dusek wrote:

Jason Dagit wrote: Perhaps I am lacking in imagination, but I still can't see the value of one tuples.

-- _jsn