1 files changed, 223 insertions, 0 deletions
diff --git a/third_party/rust/rayon/src/iter/cloned.rs b/third_party/rust/rayon/src/iter/cloned.rs
new file mode 100644
index 0000000000..8d5f420efa
--- /dev/null
+++ b/third_party/rust/rayon/src/iter/cloned.rs
@@ -0,0 +1,223 @@
+use super::plumbing::*;
+use super::*;
+
+use std::iter;
+
+/// `Cloned` is an iterator that clones the elements of an underlying iterator.
+///
+/// This struct is created by the [`cloned()`] method on [`ParallelIterator`]
+///
+/// [`cloned()`]: trait.ParallelIterator.html#method.cloned
+/// [`ParallelIterator`]: trait.ParallelIterator.html
+#[must_use = "iterator adaptors are lazy and do nothing unless consumed"]
+#[derive(Debug, Clone)]
+pub struct Cloned<I: ParallelIterator> {
+    base: I,
+}
+
+impl<I> Cloned<I>
+where
+    I: ParallelIterator,
+{
+    /// Creates a new `Cloned` iterator.
+    pub(super) fn new(base: I) -> Self {
+        Cloned { base }
+    }
+}
+
+impl<'a, T, I> ParallelIterator for Cloned<I>
+where
+    I: ParallelIterator<Item = &'a T>,
+    T: 'a + Clone + Send + Sync,
+{
+    type Item = T;
+
+    fn drive_unindexed<C>(self, consumer: C) -> C::Result
+    where
+        C: UnindexedConsumer<Self::Item>,
+    {
+        let consumer1 = ClonedConsumer::new(consumer);
+        self.base.drive_unindexed(consumer1)
+    }
+
+    fn opt_len(&self) -> Option<usize> {
+        self.base.opt_len()
+    }
+}
+
+impl<'a, T, I> IndexedParallelIterator for Cloned<I>
+where
+    I: IndexedParallelIterator<Item = &'a T>,
+    T: 'a + Clone + Send + Sync,
+{
+    fn drive<C>(self, consumer: C) -> C::Result
+    where
+        C: Consumer<Self::Item>,
+    {
+        let consumer1 = ClonedConsumer::new(consumer);
+        self.base.drive(consumer1)
+    }
+
+    fn len(&self) -> usize {
+        self.base.len()
+    }
+
+    fn with_producer<CB>(self, callback: CB) -> CB::Output
+    where
+        CB: ProducerCallback<Self::Item>,
+    {
+        return self.base.with_producer(Callback { callback });
+
+        struct Callback<CB> {
+            callback: CB,
+        }
+
+        impl<'a, T, CB> ProducerCallback<&'a T> for Callback<CB>
+        where
+            CB: ProducerCallback<T>,
+            T: 'a + Clone + Send,
+        {
+            type Output = CB::Output;
+
+            fn callback<P>(self, base: P) -> CB::Output
+            where
+                P: Producer<Item = &'a T>,
+            {
+                let producer = ClonedProducer { base };
+                self.callback.callback(producer)
+            }
+        }
+    }
+}
+
+/// ////////////////////////////////////////////////////////////////////////
+
+struct ClonedProducer<P> {
+    base: P,
+}
+
+impl<'a, T, P> Producer for ClonedProducer<P>
+where
+    P: Producer<Item = &'a T>,
+    T: 'a + Clone,
+{
+    type Item = T;
+    type IntoIter = iter::Cloned<P::IntoIter>;
+
+    fn into_iter(self) -> Self::IntoIter {
+        self.base.into_iter().cloned()
+    }
+
+    fn min_len(&self) -> usize {
+        self.base.min_len()
+    }
+
+    fn max_len(&self) -> usize {
+        self.base.max_len()
+    }
+
+    fn split_at(self, index: usize) -> (Self, Self) {
+        let (left, right) = self.base.split_at(index);
+        (
+            ClonedProducer { base: left },
+            ClonedProducer { base: right },
+        )
+    }
+
+    fn fold_with<F>(self, folder: F) -> F
+    where
+        F: Folder<Self::Item>,
+    {
+        self.base.fold_with(ClonedFolder { base: folder }).base
+    }
+}
+
+/// ////////////////////////////////////////////////////////////////////////
+/// Consumer implementation
+
+struct ClonedConsumer<C> {
+    base: C,
+}
+
+impl<C> ClonedConsumer<C> {
+    fn new(base: C) -> Self {
+        ClonedConsumer { base }
+    }
+}
+
+impl<'a, T, C> Consumer<&'a T> for ClonedConsumer<C>
+where
+    C: Consumer<T>,
+    T: 'a + Clone,
+{
+    type Folder = ClonedFolder<C::Folder>;
+    type Reducer = C::Reducer;
+    type Result = C::Result;
+
+    fn split_at(self, index: usize) -> (Self, Self, Self::Reducer) {
+        let (left, right, reducer) = self.base.split_at(index);
+        (
+            ClonedConsumer::new(left),
+            ClonedConsumer::new(right),
+            reducer,
+        )
+    }
+
+    fn into_folder(self) -> Self::Folder {
+        ClonedFolder {
+            base: self.base.into_folder(),
+        }
+    }
+
+    fn full(&self) -> bool {
+        self.base.full()
+    }
+}
+
+impl<'a, T, C> UnindexedConsumer<&'a T> for ClonedConsumer<C>
+where
+    C: UnindexedConsumer<T>,
+    T: 'a + Clone,
+{
+    fn split_off_left(&self) -> Self {
+        ClonedConsumer::new(self.base.split_off_left())
+    }
+
+    fn to_reducer(&self) -> Self::Reducer {
+        self.base.to_reducer()
+    }
+}
+
+struct ClonedFolder<F> {
+    base: F,
+}
+
+impl<'a, T, F> Folder<&'a T> for ClonedFolder<F>
+where
+    F: Folder<T>,
+    T: 'a + Clone,
+{
+    type Result = F::Result;
+
+    fn consume(self, item: &'a T) -> Self {
+        ClonedFolder {
+            base: self.base.consume(item.clone()),
+        }
+    }
+
+    fn consume_iter<I>(mut self, iter: I) -> Self
+    where
+        I: IntoIterator<Item = &'a T>,
+    {
+        self.base = self.base.consume_iter(iter.into_iter().cloned());
+        self
+    }
+
+    fn complete(self) -> F::Result {
+        self.base.complete()
+    }
+
+    fn full(&self) -> bool {
+        self.base.full()
+    }
+}