On 18/02/13 13:41, Amy de Buitléir wrote:
I'm happy to announce a new major release of the grid package:
http://hackage.haskell.org/package/grid
https://github.com/mhwombat/grid/wiki (wiki)
After taking a peek at the documentation: have you considered removing the size
function from Grid? It is the only function that actually uses the type
parameter 's'. If you really need it, I would suggest putting it in a separate
class,
class HasSize a s | a -> s where
size :: a -> s
It might also be useful to add a rectangular grid type where diagonally adjacent
cells are also neighbors.
Another interesting idea is to have modifier types that change which cells are
neighbors, for example you could have
class Colinear g x | g x where
-- | Are three points separated by moves in the same direction?
isColinear :: g -> x -> x -> x -> Bool
-- neighbors are separated by diagonal moves
newtype Diagonal g = Diagonal g
instance (Grid g, Colinear g x) => Grid (Diagonal g) x where
neighbors g x = [z | y <- neigbhors x, z <- neigbhors y
, not (isColinear x y z)]
newtype Rook g = ...
newtype Knight g = ...
-- etc.
Twan
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