From 3e86cf36b5114f201868bf459934fe346a76a2d4 Mon Sep 17 00:00:00 2001
From: Kyle Huey <khuey@kylehuey.com>
Date: Fri, 19 Apr 2019 21:13:37 -0700
Subject: Add implementations of last in terms of next_back on a bunch of
 DoubleEndedIterators.

r?Manishearth
---
 src/libcore/slice/mod.rs | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'src/libcore/slice')

diff --git a/src/libcore/slice/mod.rs b/src/libcore/slice/mod.rs
index bf3dda48dc7..cda4268607f 100644
--- a/src/libcore/slice/mod.rs
+++ b/src/libcore/slice/mod.rs
@@ -3539,6 +3539,11 @@ impl<'a, T, P> Iterator for Split<'a, T, P> where P: FnMut(&T) -> bool {
             (1, Some(self.v.len() + 1))
         }
     }
+
+    #[inline]
+    fn last(mut self) -> Option<Self::Item> {
+        self.next_back()
+    }
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
@@ -3637,6 +3642,11 @@ impl<'a, T, P> Iterator for SplitMut<'a, T, P> where P: FnMut(&T) -> bool {
             (1, Some(self.v.len() + 1))
         }
     }
+
+    #[inline]
+    fn last(mut self) -> Option<Self::Item> {
+        self.next_back()
+    }
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
@@ -3702,6 +3712,11 @@ impl<'a, T, P> Iterator for RSplit<'a, T, P> where P: FnMut(&T) -> bool {
     fn size_hint(&self) -> (usize, Option<usize>) {
         self.inner.size_hint()
     }
+
+    #[inline]
+    fn last(mut self) -> Option<Self::Item> {
+        self.next_back()
+    }
 }
 
 #[stable(feature = "slice_rsplit", since = "1.27.0")]
@@ -3766,6 +3781,11 @@ impl<'a, T, P> Iterator for RSplitMut<'a, T, P> where P: FnMut(&T) -> bool {
     fn size_hint(&self) -> (usize, Option<usize>) {
         self.inner.size_hint()
     }
+
+    #[inline]
+    fn last(mut self) -> Option<Self::Item> {
+        self.next_back()
+    }
 }
 
 #[stable(feature = "slice_rsplit", since = "1.27.0")]
-- 
cgit 1.4.1-3-g733a5