2010/11/1 Paolino <paolo.verone...@gmail.com>: > I think I've got something nice in the end. > > http://hpaste.org/41042/classsynonymhs > > example: > > class ( ParteDi (Servizio a) s > , Read a > , Eq a > , Show a > , Integer `ParteDi` s > ) ⇒ SClass s a > > $(classSynonym ''SClass) > > ghci ":i SClass" command is printing some strange type variables but it > compiles >
Template Haskell might be overkill for this. In the past, I've done: > class (Eq b, Show b, MyClass b, MyOtherClass b) => MySynonym b > instance (Eq b, Show b, MyClass b, MyOtherClass b) => MySynonym b I think this requires a couple of GHC extensions, but TemplateHaskell is an extension as well. Maybe there are pitfalls with this approach. Antoine _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
