Here is a proposal I am satisfied with:
https://github.com/elixir-lang/elixir/pull/9426
It solves sorting but it doesn't solve getting the earliest/latest. There
will be another PR to address those. The idea is to provide a general
framework to address these limitations, as it will also be useful for
libraries like Decimal.
*José Valim*
www.plataformatec.com.br
Skype: jv.ptec
Founder and Director of R&D
On Fri, Oct 18, 2019 at 9:39 AM Dmitry Belyaev <be.dmi...@gmail.com> wrote:
> I suppose it's reasonable to have a defined ordering within a particular
> class e.g. number class includes integers and floats, and have some
> (possibly undefined) ordering between classes. This basically is the same
> as Erlang term order, but for every struct we could define its own class or
> in some special cases a few structures would map to the same ordering class.
>
> Then to make Erlang term ordering to work for us we can build a tuple
> {{class, class_ordering_term}, original_term}, e.g {{Number, 1}, 1},
> {{DateTime, epoch_integer}, %DateTime{...}}, {{Atom, nil}, nil}.
>
> On 18 October 2019 9:27:54 am AEDT, "José Valim" <
> jose.va...@plataformatec.com.br> wrote:
>>
>>
>>
>>> I do wonder about your follow-up: Why would it not work for integers?
>>> (and float and decimals)? At least as long as we are comparing collections
>>> of *only* integers or *only* floats or *only* decimals, the result
>>> would be sensible.
>>>
>> If we want to make Ordered work between them, well, then it becomes a bit
>>> more difficult: In that case we probably would need to 'upcast' all of them
>>> into some kind of more general tuples-of-integers-and-strings form.
>>>
>>
>> Exactly. That's the problem and at a quick glance I could not find a
>> solution. I am glad to be proven wrong though!
>>
>>
>>
> --
> Kind regards,
> Dmitry Belyaev
>
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