1 files changed, 35 insertions, 0 deletions
diff --git a/js/src/ds/IdValuePair.h b/js/src/ds/IdValuePair.h
new file mode 100644
index 0000000000..acf6b8b5fa
--- /dev/null
+++ b/js/src/ds/IdValuePair.h
@@ -0,0 +1,35 @@
+/* -*- 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 ds_IdValuePair_h
+#define ds_IdValuePair_h
+
+#include "gc/Tracer.h"
+#include "js/GCVector.h"
+#include "js/Id.h"
+#include "js/Value.h"
+
+namespace js {
+
+struct IdValuePair {
+  JS::Value value;
+  jsid id;
+
+  IdValuePair() : value(JS::UndefinedValue()), id(JSID_EMPTY) {}
+  explicit IdValuePair(jsid idArg) : value(JS::UndefinedValue()), id(idArg) {}
+  IdValuePair(jsid idArg, const Value& valueArg) : value(valueArg), id(idArg) {}
+
+  void trace(JSTracer* trc) {
+    TraceRoot(trc, &value, "IdValuePair::value");
+    TraceRoot(trc, &id, "IdValuePair::id");
+  }
+};
+
+using IdValueVector = JS::GCVector<IdValuePair, 8>;
+
+} /* namespace js */
+
+#endif /* ds_IdValuePair_h */