Is this library support parallel iterator?

[hzqd]

Or plans to support this feature？

[mbrubeck]

I don't have any specific plans, but would be happy to accept a patch adding rayon::IntoParallelIterator support.

[Owen-CH-Leung]

I believe ParallelIterator is already possible with SmallVec due to dereference coercion. For example:

let mut v: SmallVec<u8, 10> = smallvec!(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
println!("{:?}", v.into_par_iter());

will invoke this:

https://github.com/rayon-rs/rayon/blob/master/src/slice/mod.rs#L671-L678

And I believe the existing ParallelIterator implementation provided by rayon should be sufficient ? If not, please let me know. Happy to contribute

[haydnv]

This would be useful in cases where it's not possible to iterate over a value borrowed from a SmallVec, e.g.

let output = input
    .par_chunks(4)
    .map(SmallVec::from_slice) // the lifetime of this SmallVec is less than the iterator itself
    .map(do_something)
    .flatten() // this won't work since SmallVec itself doesn't implement `into_par_iter`
    .collect();

[bolshoytoster]

Is this still wanted? I can implement it now if so.

Without this, you should still be able to achieve the same thing with .map(SmallVec::into_vec), but that would have to move the items to the heap if they weren't there before (defeats the point of using a SmallVec).