[Haskell-cafe] ANN: has-0.4 Entity based records

[HASHIMOTO, Yusaku]

On 11 May 2010 03:25, adam vogt <vogt.adam at gmail.com> wrote:
> On Tue, May 4, 2010 at 12:18 PM, HASHIMOTO, Yusaku <nonowarn at gmail.com> wrote:
>> This library is inspired by HList[2], and interfaces are stealed from
>> data-accessors[3]. And lenses[4], fclabels[5], and records[6] devote
>> themselves to similar purposes.
>>
>> [2]: http://hackage.haskell.org/package/HList
>> [3]: http://hackage.haskell.org/package/data-accessor
>> [4]: http://hackage.haskell.org/package/lenses
>> [5]: http://hackage.haskell.org/package/fclabels
>> [6]: http://hackage.haskell.org/package/records
>>
>> Enjoy!
>>
>> -nwn
>
> Which niche does `has' fit between extensible (and more complicated)
> records like HList and records vs the libraries that provide only
> accessors?

You may find `has' useful when you want to use a label name in more
than one record structures. This is achieved by HList, records and
wreckage, But I think has at its interface.