1 files changed, 121 insertions, 0 deletions
diff --git a/third_party/rust/dashmap/src/rayon/set.rs b/third_party/rust/dashmap/src/rayon/set.rs
new file mode 100644
index 0000000000..11c06ccbd1
--- /dev/null
+++ b/third_party/rust/dashmap/src/rayon/set.rs
@@ -0,0 +1,121 @@
+use crate::setref::multiple::RefMulti;
+use crate::DashSet;
+use core::hash::{BuildHasher, Hash};
+use rayon::iter::plumbing::UnindexedConsumer;
+use rayon::iter::{FromParallelIterator, IntoParallelIterator, ParallelExtend, ParallelIterator};
+use std::collections::hash_map::RandomState;
+
+impl<K, S> ParallelExtend<K> for DashSet<K, S>
+where
+    K: Send + Sync + Eq + Hash,
+    S: Send + Sync + Clone + BuildHasher,
+{
+    fn par_extend<I>(&mut self, par_iter: I)
+    where
+        I: IntoParallelIterator<Item = K>,
+    {
+        (&*self).par_extend(par_iter);
+    }
+}
+
+// Since we don't actually need mutability, we can implement this on a
+// reference, similar to `io::Write for &File`.
+impl<K, S> ParallelExtend<K> for &'_ DashSet<K, S>
+where
+    K: Send + Sync + Eq + Hash,
+    S: Send + Sync + Clone + BuildHasher,
+{
+    fn par_extend<I>(&mut self, par_iter: I)
+    where
+        I: IntoParallelIterator<Item = K>,
+    {
+        let &mut set = self;
+        par_iter.into_par_iter().for_each(move |key| {
+            set.insert(key);
+        });
+    }
+}
+
+impl<K, S> FromParallelIterator<K> for DashSet<K, S>
+where
+    K: Send + Sync + Eq + Hash,
+    S: Send + Sync + Clone + Default + BuildHasher,
+{
+    fn from_par_iter<I>(par_iter: I) -> Self
+    where
+        I: IntoParallelIterator<Item = K>,
+    {
+        let set = Self::default();
+        (&set).par_extend(par_iter);
+        set
+    }
+}
+
+impl<K, S> IntoParallelIterator for DashSet<K, S>
+where
+    K: Send + Eq + Hash,
+    S: Send + Clone + BuildHasher,
+{
+    type Iter = OwningIter<K, S>;
+    type Item = K;
+
+    fn into_par_iter(self) -> Self::Iter {
+        OwningIter {
+            inner: self.inner.into_par_iter(),
+        }
+    }
+}
+
+pub struct OwningIter<K, S = RandomState> {
+    inner: super::map::OwningIter<K, (), S>,
+}
+
+impl<K, S> ParallelIterator for OwningIter<K, S>
+where
+    K: Send + Eq + Hash,
+    S: Send + Clone + BuildHasher,
+{
+    type Item = K;
+
+    fn drive_unindexed<C>(self, consumer: C) -> C::Result
+    where
+        C: UnindexedConsumer<Self::Item>,
+    {
+        self.inner.map(|(k, _)| k).drive_unindexed(consumer)
+    }
+}
+
+// This impl also enables `IntoParallelRefIterator::par_iter`
+impl<'a, K, S> IntoParallelIterator for &'a DashSet<K, S>
+where
+    K: Send + Sync + Eq + Hash,
+    S: Send + Sync + Clone + BuildHasher,
+{
+    type Iter = Iter<'a, K, S>;
+    type Item = RefMulti<'a, K, S>;
+
+    fn into_par_iter(self) -> Self::Iter {
+        Iter {
+            inner: (&self.inner).into_par_iter(),
+        }
+    }
+}
+
+pub struct Iter<'a, K, S = RandomState> {
+    inner: super::map::Iter<'a, K, (), S>,
+}
+
+impl<'a, K, S> ParallelIterator for Iter<'a, K, S>
+where
+    K: Send + Sync + Eq + Hash,
+    S: Send + Sync + Clone + BuildHasher,
+{
+    type Item = RefMulti<'a, K, S>;
+
+    fn drive_unindexed<C>(self, consumer: C) -> C::Result
+    where
+        C: UnindexedConsumer<Self::Item>,
+    {
+        self.inner.map(RefMulti::new).drive_unindexed(consumer)
+    }
+}