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List:       haskell-beginners
Subject:    Re: [Haskell-beginners] one more step backwards
From:       Stephen Tetley <stephen.tetley () gmail ! com>
Date:       2010-01-31 20:22:41
Message-ID: 5fdc56d71001311222y55084f81m97a62564cf19851e () mail ! gmail ! com
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On 31 January 2010 19:53, Felipe Lessa <felipe.lessa@gmail.com> wrote:

> Along these lines we may also change evalStep using the Writer
> monad.

Hi Felipe - nice!

Bill Harrison lists DebugT (equipped with the non-proper morphism
'rollback') as one of the monad transformers in his periodic table of
effects:

http://www.cs.missouri.edu/~harrisonwl/Presentations/UIUCFM05.ppt

I've been curious since first seeing the slides, how an implementation
might efficiently store the state...

Best wishes

Stephen
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