AFAIK Strafunsky lets you thread an arbitrary monad through your traversal of a datatype, thread the IO monad and use 'Data.Unique' which provides 'newUnique' that spits out a unique integer. John http://haskell.cs.yale.edu/ghc/docs/latest/html/base/Data.Unique.html On Sat, Dec 07, 2002 at 04:43:57PM -0800, Reto Kramer wrote:
I'm trying to create a function (using ghc 5.04.2) that returns a unique string label each time it's called (unique w.r.t. the program run). Using the system timer doesn't cut it (too coarse and hence not unique).
The challenge is that I'm using Strafunsky to traverse a syntax tree and rewrite expression nodes, so I cannot "thread" a counter all through this existing library, but need some "side-effecting" store that I can update.
Any suggestions to such a basic question?
- Reto
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