There is a hashtable in the IO monad:

http://www.haskell.org/ghc/docs/latest/html/libraries/base/Data.HashTable.html

I understand there was an important bugfix that went into 6.2.2 for this hashtable implementation, so you'll probably want to make sure to use the latest GHC if you'll be using this.



Petter Egesund wrote:

Does anybody know about a mutable hash implementation for ghc?

There is going to be a lot of updates in the hash (some millions adds and removes) so a non-mutable structure will not do?!

Cheers,

Petter

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