1 files changed, 30 insertions, 0 deletions
diff --git a/xpcom/string/nsTStringHasher.h b/xpcom/string/nsTStringHasher.h
new file mode 100644
index 0000000000..7b3f42ba58
--- /dev/null
+++ b/xpcom/string/nsTStringHasher.h
@@ -0,0 +1,30 @@
+/* -*- 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/. */
+
+#ifndef nsTStringHasher_h___
+#define nsTStringHasher_h___
+
+#include "mozilla/HashTable.h"  // mozilla::{DefaultHasher, HashNumber, HashString}
+
+namespace mozilla {
+
+template <typename T>
+struct DefaultHasher<nsTString<T>> {
+  using Key = nsTString<T>;
+  using Lookup = nsTString<T>;
+
+  static mozilla::HashNumber hash(const Lookup& aLookup) {
+    return mozilla::HashString(aLookup.get());
+  }
+
+  static bool match(const Key& aKey, const Lookup& aLookup) {
+    return aKey.Equals(aLookup);
+  }
+};
+
+}  // namespace mozilla
+
+#endif  // !defined(nsTStringHasher_h___)