1 files changed, 22 insertions, 0 deletions
diff --git a/xpcom/ds/nsArrayUtils.cpp b/xpcom/ds/nsArrayUtils.cpp
new file mode 100644
index 0000000000..e8ea8bd0f2
--- /dev/null
+++ b/xpcom/ds/nsArrayUtils.cpp
@@ -0,0 +1,22 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsArrayUtils.h"
+
+//
+// do_QueryElementAt helper stuff
+//
+nsresult nsQueryArrayElementAt::operator()(const nsIID& aIID,
+                                           void** aResult) const {
+  nsresult status = mArray ? mArray->QueryElementAt(mIndex, aIID, aResult)
+                           : NS_ERROR_NULL_POINTER;
+
+  if (mErrorPtr) {
+    *mErrorPtr = status;
+  }
+
+  return status;
+}