Override size_hint and implement ExactSizeIterator

Author: sfackler

src/array.rs

@@ -273,6 +273,10 @@ impl<'a, T: 'a> Iterator for Iter<'a, T>{
 fnnext(&mutself) -> Option<&'aT>{
 self.inner.next()
 }
+
+fnsize_hint(&self) -> (usize,Option<usize>){
+self.inner.size_hint()
+}
 }
 
 impl<'a,T:'a>DoubleEndedIteratorforIter<'a,T>{
@@ -281,6 +285,12 @@ impl<'a, T: 'a> DoubleEndedIterator for Iter<'a, T>{
 }
 }
 
+impl<'a,T:'a>ExactSizeIteratorforIter<'a,T>{
+fnlen(&self) -> usize{
+self.inner.len()
+}
+}
+
 /// An iterator over mutable references to values of an `Array` in the
 /// higher-dimensional equivalent of row-major order.
 pubstructIterMut<'a,T:'a>{
@@ -293,6 +303,10 @@ impl<'a, T: 'a> Iterator for IterMut<'a, T>{
 fnnext(&mutself) -> Option<&'amutT>{
 self.inner.next()
 }
+
+fnsize_hint(&self) -> (usize,Option<usize>){
+self.inner.size_hint()
+}
 }
 
 impl<'a,T:'a>DoubleEndedIteratorforIterMut<'a,T>{
@@ -301,6 +315,12 @@ impl<'a, T: 'a> DoubleEndedIterator for IterMut<'a, T>{
 }
 }
 
+impl<'a,T:'a>ExactSizeIteratorforIterMut<'a,T>{
+fnlen(&self) -> usize{
+self.inner.len()
+}
+}
+
 /// An iterator over values of an `Array` in the higher-dimensional
 /// equivalent of row-major order.
 pubstructIntoIter<T>{
@@ -313,10 +333,20 @@ impl<T> Iterator for IntoIter<T>{
 fnnext(&mutself) -> Option<T>{
 self.inner.next()
 }
+
+fnsize_hint(&self) -> (usize,Option<usize>){
+self.inner.size_hint()
+}
 }
 
 impl<T>DoubleEndedIteratorforIntoIter<T>{
 fnnext_back(&mutself) -> Option<T>{
 self.inner.next_back()
 }
 }
+
+impl<T>ExactSizeIteratorforIntoIter<T>{
+fnlen(&self) -> usize{
+self.inner.len()
+}
+}