[Haskell-cafe] Modelling a mutable variable store

Robin Green greenrd at greenrd.org
Sat Dec 1 22:29:28 EST 2007

On Sat, 01 Dec 2007 21:22:53 -0600
Derek Elkins <derek.a.elkins at gmail.com> wrote:

> > There's also the issue of finding a more elegant way of threading
> > the Store through my evaluator, but I'm not concerned too much
> > about that at this point.  I can probably define a state-carrying
> > monad like Parsec. My real concerns are the first two issues.
> Use ST.  First-class state isn't too great unless you specifically
> want that.

Or use IO - that way you can use a Hashtable for looking up
identifiers. Although, better still is to convert variable
references into Ints, instead of using a Hashtable.

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