Iterator: new function Count()

list-iterator.go

@@ -143,7 +143,12 @@ func (it *ListIterator) Index() int {
 	return it.index
 }
 
+func (it *ListIterator) Count() int {
+	return it.count
+}
+
 func (it *ListIterator) Reset() (bool, error) {
 	it.index = it.start - it.step
+	it.count = 0
 	return true, nil
 }