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