[Haskell-cafe] Looking for reliable heterogeneous vectors

Mike Izbicki mike at izbicki.me
Mon Dec 2 04:52:49 UTC 2013

I don't understand what you mean by immutable and persistant, because
vector-heterogenous is both of those!  It just uses a standard boxed vector
as the backend and does some unsafeCoercing to get the types to line up.

On Sun, Dec 1, 2013 at 7:40 PM, Sergey Bushnyak <sergey.bushnyak at sigrlami.eu
> wrote:

>  On 12/02/2013 03:58 AM, Mike Izbicki wrote:
> Author of vector-heterogenous here.  I tried to design the package to meet
> use cases like you describe, but fully admit that it's not perfect.  It's
> missing a lot of the functions you might expect from the regular vector
> package (some of them are because I didn't need them, and some are because
> the best implementation is not obvious), and syntax is still a little
> awkward for my tastes.
>  So if you have any ideas on improvements, I'd definitely be willing to
> incorporate them.  Or if you have a great idea for a complete redesign of
> the package, I'd be happy to replace everything and let you take over.
> On Sun, Dec 1, 2013 at 12:11 PM, Sergey Bushnyak <
> sergey.bushnyak at sigrlami.eu> wrote:
>> Hello, everyone. I'm looking for reliable library or idea how to
>> implement heterogenous vector properly. It may seem odd, but I want
>> elements not only be different types but also functions, something like
>> that, pseudocode:
>>     hvec [a b (c->d) [a] ...]  -- can be any type
>>     let hvec = hvec [ "stuff" 5 getUrl [1, 4, 5]]
>> So far I found *vector-heterogenous* package, but can't decide is it good
>> to build on or create something on my own.
>> Any thoughts and ideas are appreciated. Thanks.
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>   Mike, thank you for quick response, nice to hear you open for
> improvements. I'm also looking for this kind of package to be not only
> heterogeneous, but immutable and persistent, which leads to higher level of
> abstraction, something like *collection*. It will be nice to derive
> different types from it, like hvector, hlist etc.
> I'm doing small research now, if I'll understand that it's better to build
> upon your library or even reshape it I'll drop you an email.
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