impl ParallelExtend for tuple pairs #604
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`ParallelExtend<(A, B)>` and `ParallelExtend<Either<L, R>>` for tuples behave like `unzip` and `partition_map` respectively. These allow the possibility of nested `unzip` and `partition_map` operations, filling into more than just two collections. For instance, `(A, (B, C))` items can be unzipped into `(Vec<A>, (Vec<B>, Vec<C>))`.
cuviper
commented
Oct 9, 2018
| @@ -386,3 +395,57 @@ impl<A, B, RA, RB> Reducer<(A, B)> for UnzipReducer<RA, RB> | |||
| (self.left.reduce(left.0, right.0), self.right.reduce(left.1, right.1)) | |||
| } | |||
| } | |||
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| impl<A, B, FromA, FromB> ParallelExtend<(A, B)> for (FromA, FromB) | |||
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FWIW, the standard library does not have an Extend implementation like this, though I think it could. The value there would not be as high though, as there's significantly more magic involved in the parallel implementation.
cuviper
commented
Oct 9, 2018
| } | ||
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| impl<L, R, A, B> ParallelExtend<Either<L, R>> for (A, B) |
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I think coherence rules would make this impossible for Extend since tuples aren't fundamental -- the either crate can't implement the trait for a generic tuple type. So this is a unique possibility for ParallelExtend!
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Hmm, Rust 1.41's "re-rebalance coherence" would allow this now... 🤔
nikomatsakis
approved these changes
Oct 30, 2018
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bors r+ |
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604: impl ParallelExtend for tuple pairs r=nikomatsakis a=cuviper `ParallelExtend<(A, B)>` and `ParallelExtend<Either<L, R>>` for tuples behave like `unzip` and `partition_map` respectively. These allow the possibility of nested `unzip` and `partition_map` operations, filling into more than just two collections. For instance, `(A, (B, C))` items can be unzipped into `(Vec<A>, (Vec<B>, Vec<C>))`. Fixes #600. Co-authored-by: Josh Stone <cuviper@gmail.com>
This was referenced Sep 17, 2020
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Apr 1, 2021
802: impl FromParallelIterator for tuple pairs r=nikomatsakis a=cuviper Like #604 for `ParallelExtend`, implementing `FromParallelIterator` for tuple pairs opens up new possibilities for nesting `collect`. The possibility of short-circuiting into `Result<(T, U), E>` for #801 is particularly motivating. - `FromParallelIterator<(A, B)> for (FromA, FromB)` works like `unzip` - `FromParallelIterator<Either<L, R>> for (A, B)` works like `partition_map` Co-authored-by: Josh Stone <cuviper@gmail.com>
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ParallelExtend<(A, B)>andParallelExtend<Either<L, R>>for tuplesbehave like
unzipandpartition_maprespectively. These allow thepossibility of nested
unzipandpartition_mapoperations, fillinginto more than just two collections. For instance,
(A, (B, C))itemscan be unzipped into
(Vec<A>, (Vec<B>, Vec<C>)).Fixes #600.