why is Data.Set not a Monad?

[Daniel Franke]

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On Mon, May 07, 2007 at 04:56:35AM +0100, Frederik Eaton wrote:
> I guess I'd thought that the primary use of Set would be to replace
> lists for applications where order doesn't matter, or maybe where an
> efficient 'union' is needed; but many of these (e.g. parsing) commonly
> use a monadic interface, so it seems strange for Set not to have one.

A reasonably elegant solution might be to use StateT, with the contents
of the set as your state.

- -- 
 Daniel Franke         df at dfranke.us         http://www.dfranke.us
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