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

[Joachim Breitner]

Hi,

right, any any other container having special requirements on the contained type, e.g. Data.Set.

Greetings,
Joachim

Am 6. Dezember 2014 03:18:09 MEZ, schrieb John Lato <jwlato at gmail.com>:
>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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