Generics.MultiRec.TH

This module contains Template Haskell code that can be used to automatically generate the boilerplate code for the multirec library. The constructor information can be generated per datatype, the rest per family of datatypes.

Documentation

deriveConstructors :: [Name] -> Q [Dec]

Given a list of datatype names, derive datatypes and instances of class Constructor.

deriveFamily :: Name -> [Name] -> String -> Q [Dec]

Given the name of the index GADT, the names of the types in the family, and the name (as string) for the pattern functor to derive, generate the Ix and PF instances. IMPORTANT: It is assumed that the constructors of the GADT have the same names as the datatypes in the family.

deriveSystem :: Name -> [Name] -> String -> Q [Dec]

Compatibility. Use deriveFamily instead.

derivePF :: String -> [Name] -> Q [Dec]

Derive only the PF instance. Not needed if deriveFamily is used.

deriveEl :: Name -> [Name] -> Q [Dec]

Derive only the El instances. Not needed if deriveFamily is used.

deriveFam :: Name -> [Name] -> Q [Dec]

Derive only the Fam instance. Not needed if deriveFamily is used.

deriveEqS :: Name -> [Name] -> Q [Dec]

Derive only the EqS instance. Not needed if deriveFamily is used.