[Haskell-cafe] Unique monad?

[Jason Dusek]

2009/03/30 Edward Kmett <ekmett at gmail.com>:
> The main issue with generalizing consumption of input is what
> does it entail? when you are parsing a list do you have one
> element at a time consumption? or do you have the ability to
> grab a whole prefix at once? These issues tend to push you
> towards the use of the State monad anyways.

  You could approach that by stacking a supplier of prefixes on
  top of a supplier of elements (the first supplier supplies
  `a`, the second supplies `[a]`). That particular case doesn't
  force us out of generalized consumption as long as we are
  interested in stacking consumption.

--
Jason Dusek