Elixir could define Access.keys/1, which would work like the following:
Access.keys([:foo, bar]) == [Access.key(:foo), Access.key(bar)]
For defaults, you would use a tuple of key and default.
Access.keys([{:foo, %{}}, bar]) == [Access.key(:foo, %{}), Access.key(bar)]
Allen Madsen
http://www.allenmadsen.com
On Thu, Dec 8, 2016 at 9:49 AM, José Valim <[email protected]>
wrote:
> The above wouldn't be desired because you lose the important property of
> asserting the field is there. Plus, implementing behaviour means defining
> three functions, and I don't believe defstruct should pollute the user
> module with functions more than necessary.
>
> One of the reasons Access was moved to a Behaviour from a Protocol was
> exactly to promote proper usage with structs.
>
>
>
> *José Valim*
> www.plataformatec.com.br
> Skype: jv.ptec
> Founder and Director of R&D
>
> On Thu, Dec 8, 2016 at 3:08 PM, Allen Madsen <[email protected]>
> wrote:
>
>> Would it be acceptable and sufficient, when using the defstruct macro,
>> to define default implementations of the methods required for the Access
>> behaviour?
>>
>> Allen Madsen
>> http://www.allenmadsen.com
>>
>> On Thu, Dec 8, 2016 at 5:20 AM, Ólafur Arason <[email protected]>
>> wrote:
>>
>>> What is the exact problem I don't get it from the description is it that
>>> struts don't have Access built in, because that is solveable, or that
>>> because you have default value like nil set in a struct you can't create a
>>> nested structure on the fly?
>>>
>>> Regards,
>>> Olaf
>>>
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