[Haskell-cafe] Re: Tree Guidance

Chris Kuklewicz wrote:

apfelmus wrote:

...

Up-pointers won't work in Haskell, you'll need a different approach. Can you elaborate on what your tree looks like and what it stores?

"pointers" don't exist in Haskell, though they do exist in the Foreign.* interface package.

But Up-values work just fine:

Well, not really: they're read-only. To "update" a single Branch/Leaf in the presence of up-values/"pointers" requires to update the up-values of _every_ Branch/Leaf in the tree. Regards, apfelmus