1 files changed, 72 insertions, 0 deletions
diff --git a/third_party/rust/rayon/src/iter/zip_eq.rs b/third_party/rust/rayon/src/iter/zip_eq.rs
new file mode 100644
index 0000000000..4e64397d91
--- /dev/null
+++ b/third_party/rust/rayon/src/iter/zip_eq.rs
@@ -0,0 +1,72 @@
+use super::plumbing::*;
+use super::*;
+
+/// An [`IndexedParallelIterator`] that iterates over two parallel iterators of equal
+/// length simultaneously.
+///
+/// This struct is created by the [`zip_eq`] method on [`IndexedParallelIterator`],
+/// see its documentation for more information.
+///
+/// [`zip_eq`]: trait.IndexedParallelIterator.html#method.zip_eq
+/// [`IndexedParallelIterator`]: trait.IndexedParallelIterator.html
+#[must_use = "iterator adaptors are lazy and do nothing unless consumed"]
+#[derive(Debug, Clone)]
+pub struct ZipEq<A: IndexedParallelIterator, B: IndexedParallelIterator> {
+    zip: Zip<A, B>,
+}
+
+impl<A, B> ZipEq<A, B>
+where
+    A: IndexedParallelIterator,
+    B: IndexedParallelIterator,
+{
+    /// Creates a new `ZipEq` iterator.
+    pub(super) fn new(a: A, b: B) -> Self {
+        ZipEq {
+            zip: super::Zip::new(a, b),
+        }
+    }
+}
+
+impl<A, B> ParallelIterator for ZipEq<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.zip, consumer)
+    }
+
+    fn opt_len(&self) -> Option<usize> {
+        Some(self.zip.len())
+    }
+}
+
+impl<A, B> IndexedParallelIterator for ZipEq<A, B>
+where
+    A: IndexedParallelIterator,
+    B: IndexedParallelIterator,
+{
+    fn drive<C>(self, consumer: C) -> C::Result
+    where
+        C: Consumer<Self::Item>,
+    {
+        bridge(self.zip, consumer)
+    }
+
+    fn len(&self) -> usize {
+        self.zip.len()
+    }
+
+    fn with_producer<CB>(self, callback: CB) -> CB::Output
+    where
+        CB: ProducerCallback<Self::Item>,
+    {
+        self.zip.with_producer(callback)
+    }
+}