Hallo café,
Can anyone think of datatypes that are Foldable but not Traversable?
If not, what is the purpose of having a separate Foldable class?
Thanks,
Martijn.
___
Haskell-Cafe mailing list
Haskell-Cafe@haskell.org
http://www.haskell.org/mailman/
On Fri, 9 Oct 2009, Martijn van Steenbergen wrote:
Hallo café,
Can anyone think of datatypes that are Foldable but not Traversable?
If not, what is the purpose of having a separate Foldable class?
Recently I wondered, why Foldable is superclass of Traversable, since I
have examples where '
On Fri, Oct 09, 2009 at 04:41:05PM +0200, Martijn van Steenbergen wrote:
> Can anyone think of datatypes that are Foldable but not Traversable?
Set
___
Haskell-Cafe mailing list
Haskell-Cafe@haskell.org
http://www.haskell.org/mailman/listinfo/haskell-caf
On Fri, Oct 9, 2009 at 10:45 AM, Henning Thielemann <
lemm...@henning-thielemann.de> wrote:
>
> On Fri, 9 Oct 2009, Martijn van Steenbergen wrote:
>
> Hallo café,
>>
>> Can anyone think of datatypes that are Foldable but not Traversable?
>
>
Data.Set.Set is a good example. The values contained in
On Fri, Oct 09, 2009 at 04:45:01PM +0200, Henning Thielemann wrote:
> Recently I wondered, why Foldable is superclass of Traversable,
> since I have examples where 'traverse' makes sense, but 'fold' not.
>
> http://www.haskell.org/pipermail/libraries/2009-February/011361.html
That would be surpri
Ross Paterson wrote:
On Fri, Oct 09, 2009 at 04:41:05PM +0200, Martijn van Steenbergen wrote:
Can anyone think of datatypes that are Foldable but not Traversable?
Set
Nice! Thank you all for your answers.
Martijn.
___
Haskell-Cafe mailing list
Ha
