Bug 685905 - Adding ReplaceElementAt to nsTArray. r=sicking

xpcom/glue/nsTArray.h

@@ -689,6 +689,12 @@ public:
     return ReplaceElementsAt(start, count, &item, 1);
   }
 
+  // A variation on the ReplaceElementsAt method defined above.
+  template<class Item>
+  elem_type *ReplaceElementAt(index_type index, const Item& item) {
+    return ReplaceElementsAt(index, 1, item, 1);
+  }
+
   // A variation on the ReplaceElementsAt method defined above.
   template<class Item>
   elem_type *InsertElementsAt(index_type index, const Item* array,