[Haskell-cafe] Really Simple explanation of Continuations Needed
limestrael at gmail.com
Sat Oct 1 12:55:14 CEST 2011
Having worked with the operational-package, I only can recommend it. In fact
I was trying to do the same thing you are now.
The only thing is that operational needs the use of GADTs, which come as an
extension, but still are a useful and heavily used feature.
BTW Heinrich, the
evalState (sequence . repeat . State $ \s -> (s,s+1)) 0
at the end doesn't work anymore. It should be replaced by :
evalState (sequence . repeat . StateT $ \s -> Identity (s,s+1)) 0
2011/10/1 Mark Spezzano <mark.spezzano at chariot.net.au>
> Hi Heinrich,
> I'm really looking to use the Cont monad itself--but the link you gave me
> is also helpful, so thank you.
> If anyone else has words of wisdom to add to this thread please feel free
> to pitch in.
> On 01/10/2011, at 5:08 PM, Heinrich Apfelmus wrote:
> > Mark Spezzano wrote:
> >> Can someone please give me a _lucid_ and _simple_ explanation of
> >> exactly how continuations can be used in Haskell?
> >> I've already had a look at most of the tutorials and explanations on
> >> the web, but I'm still confused. Continuations and CPS have me
> >> baffled. (I have most of the Haskell textbooks and even these are
> >> sketchy on Continuations)
> >> I don't understand the notion of the Cont monad and how it can be
> >> used for multitasking, backtracking and interrupting computations. I
> >> understand that functions take in a (continuation) function that
> >> represents the work remaining to do, but all of the explanations on
> >> the web and in technical papers seems to trip over themselves in
> >> explaining the fundamentals to a CPS-newbie.
> > If you just want to implement multitasking, backtracking or interrupting
> computations, without continuations, I recommend my "Operational Monad
> > http://apfelmus.nfshost.com/articles/operational-monad.html
> > The link to the Cont monad is explained at the very end.
> > Best regards,
> > Heinrich Apfelmus
> > --
> > http://apfelmus.nfshost.com
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