Bug 1121269 - Add an AutoCleanLinkedList template that removes and deletes elements upon destruction. r=Waldo

mfbt/LinkedList.h

@@ -55,6 +55,10 @@
  *     }
  *   };
  *
+ * Additionally, the class AutoCleanLinkedList<T> is a LinkedList<T> that will
+ * remove and delete each element still within itself upon destruction. Note
+ * that because each element is deleted, elements must have been allocated
+ * using |new|.
  */
 
 #ifndef mozilla_LinkedList_h
@@ -478,6 +482,18 @@ private:
   LinkedList(const LinkedList<T>& aOther) = delete;
 };
 
+template <typename T>
+class AutoCleanLinkedList : public LinkedList<T>
+{
+public:
+  ~AutoCleanLinkedList()
+  {
+    while (T* element = this->popFirst()) {
+      delete element;
+    }
+  }
+};
+
 } /* namespace mozilla */
 
 #endif /* __cplusplus */