@@ -139,10 +139,23 @@
 
 	_capacity = _count;
 
 	return self;
 }
+
+- (void *)mutableItems
+{
+	return _items;
+}
+
+- (void *)mutableItemAtIndex: (size_t)idx
+{
+	if (idx >= _count)
+		@throw [OFOutOfRangeException exception];
+
+	return _items + idx * _itemSize;
+}
 
 - (OFData *)subdataWithRange: (of_range_t)range
 {
 	if (range.length > SIZE_MAX - range.location ||
 	    range.location + range.length > _count)