Re: Option flatten does not use an implicit conversion

I think he means it should use the equivalent of view bounds, rather than
requiring evidence that it's an actual subtype. def flatten[B](implicit
view: A => Option[B]): ...

The answer is the same issue with all implicit conversions: They make
behavior more surprising and less type-constrained.


On Fri, Mar 4, 2016 at 10:01 AM Oliver Ruebenacker <[email protected]> wrote:

>
>      Hello,
>
>   How would it work with an implicit conversion?
>
>      Best, Oliver
>
> On Fri, Mar 4, 2016 at 5:33 AM, Bruno Bieth <[email protected]> wrote:
>
>> I was surprised that Some(Success(1)).flatten does not compile?
>> What is the rationale behind this:
>>
>> def flatten[B](implicit ev: A <:< Option[B]): Option[B] = if (isEmpty)
>> None else ev(this.get)
>>
>> Why not having an implicit conversion: (implicit conv: A => Option[B])?
>>
>> Bruno
>>
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>
>
>
> --
> Oliver Ruebenacker
> Senior Software Engineer, Diabetes Portal
> <http://www.type2diabetesgenetics.org/>, Broad Institute
> <http://www.broadinstitute.org/>
>
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