Data.Functor.unzipF (Was: Data.Map.unzip?)

[John Lato]

Data.Vector.Unboxed.Vector is unzippable and not a Functor.  That's the
only case I can think of now.

On 15:24, Fri, Dec 5, 2014 David Feuer <david.feuer at gmail.com> wrote:

> Oh, you're right, there probably isn't anything unzippable that's not a
> functor, unless you go really wild. So could we just add unzip to the
> Functor class?
> On Dec 5, 2014 5:49 PM, "Joachim Breitner" <mail at joachim-breitner.de>
> wrote:
>
>> Hi,
>>
>>
>> Am Freitag, den 05.12.2014, 17:38 -0500 schrieb David Feuer:
>>
>> >
>> >         Am Freitag, den 05.12.2014, 14:09 -0800 schrieb Eric Mertens:
>> >         > Would it be significantly better than just having/using the
>> >         following
>> >         > definition?
>> >         >
>> >         > unzipF :: Functor f => f (a, b) -> (f a, f b)
>> >         > unzipF x = (fmap fst x, fmap snd x)
>> >
>> >         yes, I guess that would be sufficient. Something for
>> >         Data.Functor?
>> >
>> > This looks like it should be the default implementation of an
>> > Unzippable class, rather than a standalone function.
>> >
>>
>> Clearly, every Functor isunzippable.
>>
>> What do you expect to be Unzippable that is not a functor?
>>
>> Or are you worried about performance, and allow better implementations?
>> Then I hope we can do that without touching the desired API, e.g. using
>> RULEs.
>>
>> Greetings,
>> Joachim
>>
>> --
>> Joachim “nomeata” Breitner
>>   mail at joachim-breitner.de • http://www.joachim-breitner.de/
>>   Jabber: nomeata at joachim-breitner.de  • GPG-Key: 0xF0FBF51F
>>   Debian Developer: nomeata at debian.org
>>
>>
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