On 23 October 2004 19:25, Lauri Alanko wrote:

On Thu, Oct 21, 2004 at 09:17:20AM -0400, Robert Dockins wrote:

...

There is a hashtable in the IO monad:

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

Why is it in IO instead of the more general ST? IMHO _all_ mutable data structures should be written for ST (or a generalization thereof), since one can always use stToIO if operation in the IO monad is really required.

Because I'm lazy, and I don't use ST very often. Patches are welcome, as usual :-) Cheers, Simon