Implement div_euc for vector types

[zesterer]

No description provided.

[yoanlcq]

The issues I see :

• div_euc and mod_euc in the std are nightly only. Do we use the std with a feature gate, or do we roll our own?
• We need a trait that provides div_euc and mod_euc. To me, the best way to go would be to add it to the Num trait of num_traits (or add a new trait there or whatever; in any case that may be controversial). An alternative is just to roll our own trait and implement it for primitive types.

As an aside, this kind of thing immediately made me think about the map method. We might actually want some kind of map2 method which would allow anyone to write e.g let res = a.map2(b, |(x, y)| x.div_euc(y)); (which is admittedly a bit verbose...)

[yoanlcq]

I wouldn't mind some kind of EucOps trait in vek::ops; however, this "feels" very much like an std feature. Clamp, Lerp and friends were OK because they're not in std, and other "very-close-to-standard" traits are provided by num-traits.

My point is, I prefer avoiding to add such traits to vek; If anything, it would rather belong in num-traits; and then we could implement it for vectors where T: EucOps.

[zesterer]

div_euclid and rem_euclid are now stable.

[yoanlcq]

Yup, I would wait to see how this will be handled in num-traits.

[SparrowLii]

I have submitted the pr in num-trait. Could I ask what this operation does in vek ?( just curious.)

[zesterer]

@SparrowLii It doesn't exist in vek yet. I assumed it would just apply div/rem_euclid element-wise for vectors in much the same way as other arithmetic operations.

[Patiga]

Fixed by 2e10920 via #86

[yoanlcq]

Thanks @Patiga !