On 10/9/07, David Benbennick <[EMAIL PROTECTED]> wrote: > On 10/9/07, Johan Tibell <[EMAIL PROTECTED]> wrote: > > data Rope = Empty > > | Leaf > > | Node !Rope !Rope > > > The point is that Empty > > can only appear at the top by construction > > How about indicating this in your data type? I.e., > > data Rope = Empty | NonEmptyRope > data NonEmptyRope = Leaf | Node !NonEmptyRope !NonEmptyRope >
That would be an idea. What are the performance effects of this? I'm trying to not have too many layers of indirection (I will spend quite some time reading -ddumpsimpl to optimize this library so anything that makes that simpler is a Good Thing.) _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
