Dear all,
Ross Peterson wrote:
> The favourite customer for FDs has been the monad transformer library.
> ...
> What other libraries should Haskell' support, and what are their
> requirements?
Here are some classes from Yampa/earlier versions of FRP.
I shouldn't think they're particularly demanding.
Also, I'm not saying these classes could not be defined
differently/better. They are just examples of what
seems to me reasonable uses of FDs.
---------------------------------------------------------
-- Minimal instance: zeroVector, (*^), (^+^), dot
class Floating a => VectorSpace v a | v -> a where
zeroVector :: v
(*^) :: a -> v -> v
(^/) :: v -> a -> v
negateVector :: v -> v
(^+^) :: v -> v -> v
(^-^) :: v -> v -> v
dot :: v -> v -> a
norm :: v -> a
normalize :: v -> v
----------------------------------------------------------
-- Minimal instance: origin, .+^, .^.
class (Floating a, VectorSpace v a) =>
AffineSpace p v a | p -> v, v -> a where
origin :: p
(.+^) :: p -> v -> p
(.-^) :: p -> v -> p
(.-.) :: p -> p -> v
distance :: p -> p -> a
----------------------------------------------------------
From an old version of FRP:
FRPCore.lhs:> class MixSwitchable s a b | s a -> b where
FRPCore.lhs:> class Switchable s i | s -> i where
FRPCore.lhs: class RunningIn a b i | a -> i where
FRPCore.lhs:> class ImpAs a b | a -> b where
FRPTask.lhs: class RunningInTask a t i | a t -> i where
FRPTask.lhs:> class Monad m => StateMonad s m | m -> s where
FRPTask.lhs:> class Monad m => EnvMonad env m | m -> env where
FRPTask.lhs:> class GTask t => MsgTask t m | t -> m where
FRPTask.lhs:> class MsgTaskMap mt m nt n | mt -> m, nt -> n where
/Henrik
--
Henrik Nilsson
School of Computer Science and Information Technology
The University of Nottingham
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