Данило Глинський wrote:
> What is natural Haskell representation of such enum?
>
> enum TypeMask
> {
> UNIT,
> GAMEOBJECT,
>
> CREATURE_OR_GAMEOBJECT = UNIT | GAMEOBJECT
> };
data ObjectType = Unit | GameObject
creatureOrGameObject :: ObjectType -> Bool
creatureOrGameObject Unit = True
creatureOrGameObject GameObject = True
creatureOrGameObject _ = False
> More sophisticated question is: and what data structures must be used when
> converting this naturally one to Haskell?
>
> // 1-byte flaged enum
> enum TypeMask
> {
> // ...
> UNIT = 0x0004,
> GAMEOBJECT = 0x0008,
> // ...
>
> CREATURE_OR_GAMEOBJECT = UNIT | GAMEOBJECT
> WORLDOBJECT = UNIT | PLAYER | GAMEOBJECT | DYNAMICOBJECT | CORPSE
> // ... even more enum combos ...
> };
Pretty much as above, add all the different single bit masks as
constructors to ObjectType and define functions for the ones
that are a combination of one ore more constructor.
Erik
--
----------------------------------------------------------------------
Erik de Castro Lopo
http://www.mega-nerd.com/
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