1 files changed, 31 insertions, 0 deletions
diff --git a/xpcom/string/nsLiteralString.h b/xpcom/string/nsLiteralString.h
new file mode 100644
index 0000000000..f982724ce4
--- /dev/null
+++ b/xpcom/string/nsLiteralString.h
@@ -0,0 +1,31 @@
+/* -*- 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 nsLiteralString_h___
+#define nsLiteralString_h___
+
+#include "nscore.h"
+#include "nsString.h"
+
+#include "nsTLiteralString.h"
+
+#include "mozilla/Char16.h"
+
+#define NS_CSTRING_LITERAL_AS_STRING_LITERAL(s) u"" s
+
+#define NS_LITERAL_STRING_FROM_CSTRING(s) \
+  static_cast<const nsLiteralString&>(    \
+      nsLiteralString(NS_CSTRING_LITERAL_AS_STRING_LITERAL(s)))
+
+constexpr auto operator""_ns(const char* aStr, std::size_t aLen) {
+  return nsLiteralCString{aStr, aLen};
+}
+
+constexpr auto operator""_ns(const char16_t* aStr, std::size_t aLen) {
+  return nsLiteralString{aStr, aLen};
+}
+
+#endif /* !defined(nsLiteralString_h___) */