Implement {Send, Sync} for {Iter, IterMut}

Author: apasel422

src/lib.rs

@@ -728,6 +728,14 @@ pub struct IterMut<'a, K: 'a, V: 'a> {
     marker: marker::PhantomData<(&'a K, &'a mut V)>,
 }
 
+unsafe impl<'a, K, V> Send for Iter<'a, K, V> where K: Send, V: Send {}
+
+unsafe impl<'a, K, V> Send for IterMut<'a, K, V> where K: Send, V: Send {}
+
+unsafe impl<'a, K, V> Sync for Iter<'a, K, V> where K: Sync, V: Sync {}
+
+unsafe impl<'a, K, V> Sync for IterMut<'a, K, V> where K: Sync, V: Sync {}
+
 impl<'a, K, V> Clone for Iter<'a, K, V> {
     fn clone(&self) -> Self { Iter { ..*self } }
 }

tests/test.rs

@@ -220,3 +220,14 @@ fn test_borrow() {
     assert_eq!(map.remove(&Foo(Bar(1))), None);
     assert_eq!(map.remove(&Foo(Bar(2))), None);
 }
+
+#[test]
+fn test_send_sync() {
+    fn is_send_sync<T: Send + Sync>() {}
+
+    is_send_sync::<LinkedHashMap<u32, i32>>();
+    is_send_sync::<linked_hash_map::Iter<u32, i32>>();
+    is_send_sync::<linked_hash_map::IterMut<u32, i32>>();
+    is_send_sync::<linked_hash_map::Keys<u32, i32>>();
+    is_send_sync::<linked_hash_map::Values<u32, i32>>();
+}