Merge pull request #104 from clarcharr/clone_into_iter

Implement Clone, Debug for IntoIter

Author: bluss

src/lib.rs

@@ -748,6 +748,30 @@ impl<A: Array> Drop for IntoIter<A> {
     }
 }
 
+impl<A: Array> Clone for IntoIter<A>
+where
+    A::Item: Clone,
+{
+    fn clone(&self) -> IntoIter<A> {
+        self.v[self.index.to_usize()..]
+            .iter()
+            .cloned()
+            .collect::<ArrayVec<A>>()
+            .into_iter()
+    }
+}
+
+impl<A: Array> fmt::Debug for IntoIter<A>
+where
+    A::Item: fmt::Debug,
+{
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_list()
+            .entries(&self.v[self.index.to_usize()..])
+            .finish()
+    }
+}
+
 /// A draining iterator for `ArrayVec`.
 pub struct Drain<'a, A> 
     where A: Array,

tests/tests.rs

@@ -55,6 +55,7 @@ fn test_drop() {
 
     let flag = &Cell::new(0);
 
+    #[derive(Clone)]
     struct Bump<'a>(&'a Cell<i32>);
 
     impl<'a> Drop for Bump<'a> {
@@ -105,6 +106,24 @@ fn test_drop() {
         assert_eq!(flag.get(), 3);
     }
 
+    // test cloning into_iter
+    flag.set(0);
+    {
+        let mut array = ArrayVec::<[_; 3]>::new();
+        array.push(Bump(flag));
+        array.push(Bump(flag));
+        array.push(Bump(flag));
+        let mut iter = array.into_iter();
+        assert_eq!(flag.get(), 0);
+        iter.next();
+        assert_eq!(flag.get(), 1);
+        let clone = iter.clone();
+        assert_eq!(flag.get(), 1);
+        drop(clone);
+        assert_eq!(flag.get(), 3);
+        drop(iter);
+        assert_eq!(flag.get(), 5);
+    }
 }
 
 #[test]