Re: [Haskell-beginners] Is there a simpler way? Building a monad on `IO' Monad

On Sunday 09 January 2011 11:47:40, Arlen Cuss wrote:

Hi all,

Thanks for previous help on this list! I really appreciate it.

Today I wrote a monad and I'm not sure if I took a complicated way about it. It's essentially a State monad, except with some specialised functions that operate on the `state' if you will (though the state is rarely mutated)

If it is not mutated at all (which seems not entirely unlikely with a pair (stdin,stdout) of Handles), you should use ReaderT (Handle,Handle) IO instead of StateT (Handle,Handle) IO btw. Cheers, Daniel