From 7b480cdec6d6c046dc3cd86020f3762e37558cd4 Mon Sep 17 00:00:00 2001
From: Charles Gleason <charles_gleason@alumni.brown.edu>
Date: Tue, 1 Oct 2019 18:20:46 -0400
Subject: Implement Clone::clone_from for LinkedList

---
 src/liballoc/collections/linked_list.rs | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'src/liballoc')

diff --git a/src/liballoc/collections/linked_list.rs b/src/liballoc/collections/linked_list.rs
index 816a71f2557..998bcb87393 100644
--- a/src/liballoc/collections/linked_list.rs
+++ b/src/liballoc/collections/linked_list.rs
@@ -1197,6 +1197,19 @@ impl<T: Clone> Clone for LinkedList<T> {
     fn clone(&self) -> Self {
         self.iter().cloned().collect()
     }
+
+    fn clone_from(&mut self, other: &Self) {
+        let mut iter_other = other.iter();
+        if self.len() > other.len() {
+            self.split_off(other.len());
+        }
+        for elem in self.iter_mut() {
+            elem.clone_from(iter_other.next().unwrap());
+        }
+        if !iter_other.is_empty() {
+            self.extend(iter_other.cloned());
+        }
+    }
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-- 
cgit 1.4.1-3-g733a5