Merge #657

657: impl Deref for set::Entry r=Vtec234 a=taiki-e

*This originally suggested by @caelunshun in #535 (comment)

cc #635 

Co-authored-by: Taiki Endo <te316e89@gmail.com>

crossbeam-skiplist/src/set.rs

@@ -3,6 +3,7 @@
 use std::borrow::Borrow;
 use std::fmt;
 use std::iter::FromIterator;
+use std::ops::Deref;
 use std::ops::{Bound, RangeBounds};
 
 use crate::map;
@@ -281,6 +282,14 @@ where
     }
 }
 
+impl<T> Deref for Entry<'_, T> {
+    type Target = T;
+
+    fn deref(&self) -> &Self::Target {
+        self.value()
+    }
+}
+
 /// An owning iterator over the entries of a `SkipSet`.
 pub struct IntoIter<T> {
     inner: map::IntoIter<T, ()>,

crossbeam-skiplist/tests/set.rs

@@ -7,3 +7,27 @@ fn smoke() {
     m.insert(5);
     m.insert(7);
 }
+
+#[test]
+fn iter() {
+    let s = SkipSet::new();
+    for &x in &[4, 2, 12, 8, 7, 11, 5] {
+        s.insert(x);
+    }
+
+    assert_eq!(
+        s.iter().map(|e| *e).collect::<Vec<_>>(),
+        &[2, 4, 5, 7, 8, 11, 12]
+    );
+
+    let mut it = s.iter();
+    s.remove(&2);
+    assert_eq!(*it.next().unwrap(), 4);
+    s.remove(&7);
+    assert_eq!(*it.next().unwrap(), 5);
+    s.remove(&5);
+    assert_eq!(*it.next().unwrap(), 8);
+    s.remove(&12);
+    assert_eq!(*it.next().unwrap(), 11);
+    assert!(it.next().is_none());
+}