Re: [Haskell-cafe] Polymorphic variants

On Thursday 26 July 2007 00:07:23 Josef Svenningsson wrote:

On 7/26/07, Jon Harrop wrote:

...

Does Haskell have anything similar to OCaml's polymorphic variants?

No as such, but it's possible to simulate them. As always Oleg was the one to demonstrate how: http://okmij.org/ftp/Haskell/generics.html

Thank you. Is there any interest in adding polymorphic variants to Haskell? I think it is fair to say that OCaml has shown them to be an extremely useful construct (more common than objects in OCaml, for example). -- Dr Jon D Harrop, Flying Frog Consultancy Ltd. OCaml for Scientists http://www.ffconsultancy.com/products/ocaml_for_scientists/?e