[Haskell-cafe] Newbie question (again!) about phantom types

David F. Place d at vidplace.com
Wed Aug 8 11:59:41 EDT 2007

On Aug 8, 2007, at 11:16 AM, peterv wrote:

> I’m having difficulty to understand what phantom types are good  
> for. Is this
> just for improving runtime performance?

I found phantom types to be useful in the implementation of bit-wise  
set operations.  You can find the code Edison:


in the Data.Edison.Coll.EnumSet module.

David F. Place
mailto:d at vidplace.com

More information about the Haskell-Cafe mailing list