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/