diff -r 000000000000 -r 6474c204b198 xpcom/glue/nsDataHashtable.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/glue/nsDataHashtable.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#ifndef nsDataHashtable_h__
+#define nsDataHashtable_h__
+
+#include "nsHashKeys.h"
+#include "nsBaseHashtable.h"
+
+/**
+ * templated hashtable class maps keys to simple datatypes.
+ * See nsBaseHashtable for complete declaration
+ * @param KeyClass a wrapper-class for the hashtable key, see nsHashKeys.h
+ *   for a complete specification.
+ * @param DataType the simple datatype being wrapped
+ * @see nsInterfaceHashtable, nsClassHashtable
+ */
+template<class KeyClass,class DataType>
+class nsDataHashtable :
+  public nsBaseHashtable<KeyClass,DataType,DataType>
+{
+public:
+  nsDataHashtable()
+  {
+  }
+  explicit nsDataHashtable(uint32_t aInitSize)
+    : nsBaseHashtable<KeyClass,DataType,DataType>(aInitSize)
+  {
+  }
+};
+
+#endif // nsDataHashtable_h__