Data.Express.Express.Derive

Allows automatic derivation of Express typeclass instances.

Documentation

deriveExpress :: Name -> DecsQ

Derives an Express instance for the given type Name.

This function needs the TemplateHaskell extension.

If -:, ->:, ->>:, ->>>:, ... are not in scope, this will derive them as well.

deriveExpressCascading :: Name -> DecsQ

Derives a Express instance for a given type Name cascading derivation of type arguments as well.

deriveExpressIfNeeded :: Name -> DecsQ

Same as deriveExpress but does not warn when instance already exists (deriveExpress is preferable).