Réf. : [Haskell-cafe] Re: circular imports

[corentin.dupont at ext.mpsa.com]

That sort of code (stripped out):

In Game.hs:

data Game = Game { ...
                   activeRules :: [Rule]}

applyTo :: Rule -> Game -> Game
applyTo r gs = ...


In Rule.hs:

data Rule = Cond (Obs) Rule Rule
          | many others..
          deriving (Read, Show, Eq, Typeable)

data NamedRule = NamedRule { ...,
                             rule :: Rule }

isRuleLegal :: Rule -> NamedRule -> Game -> Bool
isRuleLegal = ...


In Obs.hs:

data Obs a where
     ProposedBy :: Obs Int   -- The player that proposed the tested rule
     ...


evalObs :: Obs -> NamedRule -> Game -> EvalObsType
evalObs = ...


Corentin




                                                                           
             Johannes                                                      
             Waldmann                                                      
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                                       [Haskell-cafe] Re: circular imports 
                                                                           
             07/09/2010 14:00                                              
                                                                           
                                                                           
                                                                           
                                                                           




 <corentin.dupont <at> ext.mpsa.com> writes:

> I had recently a really hard time splitting up my program into parts!
> The natural, business-oriented split up drove me into a deadly circular
> dependency.

perhaps you could post your code (enough of it to understand the problem)?

J.W.


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