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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /third_party/rust/rayon/src/iter/zip.rs
parentInitial commit. (diff)
downloadfirefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz
firefox-26a029d407be480d791972afb5975cf62c9360a6.zip
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/rust/rayon/src/iter/zip.rs')
-rw-r--r--third_party/rust/rayon/src/iter/zip.rs159
1 files changed, 159 insertions, 0 deletions
diff --git a/third_party/rust/rayon/src/iter/zip.rs b/third_party/rust/rayon/src/iter/zip.rs
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+++ b/third_party/rust/rayon/src/iter/zip.rs
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+use super::plumbing::*;
+use super::*;
+use std::cmp;
+use std::iter;
+
+/// `Zip` is an iterator that zips up `a` and `b` into a single iterator
+/// of pairs. This struct is created by the [`zip()`] method on
+/// [`IndexedParallelIterator`]
+///
+/// [`zip()`]: trait.IndexedParallelIterator.html#method.zip
+/// [`IndexedParallelIterator`]: trait.IndexedParallelIterator.html
+#[must_use = "iterator adaptors are lazy and do nothing unless consumed"]
+#[derive(Debug, Clone)]
+pub struct Zip<A: IndexedParallelIterator, B: IndexedParallelIterator> {
+ a: A,
+ b: B,
+}
+
+impl<A, B> Zip<A, B>
+where
+ A: IndexedParallelIterator,
+ B: IndexedParallelIterator,
+{
+ /// Creates a new `Zip` iterator.
+ pub(super) fn new(a: A, b: B) -> Self {
+ Zip { a, b }
+ }
+}
+
+impl<A, B> ParallelIterator for Zip<A, B>
+where
+ A: IndexedParallelIterator,
+ B: IndexedParallelIterator,
+{
+ type Item = (A::Item, B::Item);
+
+ fn drive_unindexed<C>(self, consumer: C) -> C::Result
+ where
+ C: UnindexedConsumer<Self::Item>,
+ {
+ bridge(self, consumer)
+ }
+
+ fn opt_len(&self) -> Option<usize> {
+ Some(self.len())
+ }
+}
+
+impl<A, B> IndexedParallelIterator for Zip<A, B>
+where
+ A: IndexedParallelIterator,
+ B: IndexedParallelIterator,
+{
+ fn drive<C>(self, consumer: C) -> C::Result
+ where
+ C: Consumer<Self::Item>,
+ {
+ bridge(self, consumer)
+ }
+
+ fn len(&self) -> usize {
+ cmp::min(self.a.len(), self.b.len())
+ }
+
+ fn with_producer<CB>(self, callback: CB) -> CB::Output
+ where
+ CB: ProducerCallback<Self::Item>,
+ {
+ return self.a.with_producer(CallbackA {
+ callback,
+ b: self.b,
+ });
+
+ struct CallbackA<CB, B> {
+ callback: CB,
+ b: B,
+ }
+
+ impl<CB, ITEM, B> ProducerCallback<ITEM> for CallbackA<CB, B>
+ where
+ B: IndexedParallelIterator,
+ CB: ProducerCallback<(ITEM, B::Item)>,
+ {
+ type Output = CB::Output;
+
+ fn callback<A>(self, a_producer: A) -> Self::Output
+ where
+ A: Producer<Item = ITEM>,
+ {
+ self.b.with_producer(CallbackB {
+ a_producer,
+ callback: self.callback,
+ })
+ }
+ }
+
+ struct CallbackB<CB, A> {
+ a_producer: A,
+ callback: CB,
+ }
+
+ impl<CB, A, ITEM> ProducerCallback<ITEM> for CallbackB<CB, A>
+ where
+ A: Producer,
+ CB: ProducerCallback<(A::Item, ITEM)>,
+ {
+ type Output = CB::Output;
+
+ fn callback<B>(self, b_producer: B) -> Self::Output
+ where
+ B: Producer<Item = ITEM>,
+ {
+ self.callback.callback(ZipProducer {
+ a: self.a_producer,
+ b: b_producer,
+ })
+ }
+ }
+ }
+}
+
+/// ////////////////////////////////////////////////////////////////////////
+
+struct ZipProducer<A: Producer, B: Producer> {
+ a: A,
+ b: B,
+}
+
+impl<A: Producer, B: Producer> Producer for ZipProducer<A, B> {
+ type Item = (A::Item, B::Item);
+ type IntoIter = iter::Zip<A::IntoIter, B::IntoIter>;
+
+ fn into_iter(self) -> Self::IntoIter {
+ self.a.into_iter().zip(self.b.into_iter())
+ }
+
+ fn min_len(&self) -> usize {
+ cmp::max(self.a.min_len(), self.b.min_len())
+ }
+
+ fn max_len(&self) -> usize {
+ cmp::min(self.a.max_len(), self.b.max_len())
+ }
+
+ fn split_at(self, index: usize) -> (Self, Self) {
+ let (a_left, a_right) = self.a.split_at(index);
+ let (b_left, b_right) = self.b.split_at(index);
+ (
+ ZipProducer {
+ a: a_left,
+ b: b_left,
+ },
+ ZipProducer {
+ a: a_right,
+ b: b_right,
+ },
+ )
+ }
+}