Data.Enum.Deriving

Exports functions to mechanically derive Enum instances.

Enum

deriveEnum :: Name -> Q [Dec]

Generates an Enum instance declaration for the given data type or data family instance.

makeSucc :: Name -> Q Exp

Generates a lambda expression which behaves like succ (without requiring an Enum instance).

makePred :: Name -> Q Exp

Generates a lambda expression which behaves like pred (without requiring an Enum instance).

makeToEnum :: Name -> Q Exp

Generates a lambda expression which behaves like toEnum (without requiring an Enum instance).

makeFromEnum :: Name -> Q Exp

Generates a lambda expression which behaves like fromEnum (without requiring an Enum instance).

makeEnumFrom :: Name -> Q Exp

Generates a lambda expression which behaves like enumFrom (without requiring an Enum instance).

makeEnumFromThen :: Name -> Q Exp

Generates a lambda expression which behaves like enumFromThen (without requiring an Enum instance).

deriveEnum limitations

Be aware of the following potential gotchas:

• Type variables of kind * are assumed to have Enum constraints. If this is not desirable, use makeToEnum or one of its cousins.