diff -r 000000000000 -r 6474c204b198 js/public/Vector.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/public/Vector.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,66 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * 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 js_Vector_h
+#define js_Vector_h
+
+#include "mozilla/Vector.h"
+
+/* Silence dire "bugs in previous versions of MSVC have been fixed" warnings */
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable:4345)
+#endif
+
+namespace js {
+
+class TempAllocPolicy;
+
+// If we had C++11 template aliases, we could just use this:
+//
+//   template <typename T,
+//             size_t MinInlineCapacity = 0,
+//             class AllocPolicy = TempAllocPolicy>
+//   using Vector = mozilla::Vector<T, MinInlineCapacity, AllocPolicy>;
+//
+// ...and get rid of all the CRTP madness in mozilla::Vector(Base).  But we
+// can't because compiler support's not up to snuff.  (Template aliases are in
+// gcc 4.7 and clang 3.0 and are expected to be in MSVC 2013.)  Instead, have a
+// completely separate class inheriting from mozilla::Vector, and throw CRTP at
+// the problem til things work.
+//
+// This workaround presents a couple issues.  First, because js::Vector is a
+// distinct type from mozilla::Vector, overload resolution, method calls, etc.
+// are affected.  *Hopefully* this won't be too bad in practice.  (A bunch of
+// places had to be fixed when mozilla::Vector was introduced, but it wasn't a
+// crazy number.)  Second, mozilla::Vector's interface has to be made subclass-
+// ready via CRTP -- or rather, via mozilla::VectorBase, which basically no one
+// should use.  :-)  Third, we have to redefine the constructors and the non-
+// inherited operators.  Blech.  Happily there aren't too many of these, so it
+// isn't the end of the world.
+
+template <typename T,
+          size_t MinInlineCapacity = 0,
+          class AllocPolicy = TempAllocPolicy>
+class Vector
+  : public mozilla::VectorBase<T,
+                               MinInlineCapacity,
+                               AllocPolicy,
+                               Vector<T, MinInlineCapacity, AllocPolicy> >
+{
+    typedef typename mozilla::VectorBase<T, MinInlineCapacity, AllocPolicy, Vector> Base;
+
+  public:
+    Vector(AllocPolicy alloc = AllocPolicy()) : Base(alloc) {}
+    Vector(Vector &&vec) : Base(mozilla::Move(vec)) {}
+    Vector &operator=(Vector &&vec) {
+        return Base::operator=(mozilla::Move(vec));
+    }
+};
+
+} // namespace js
+
+#endif /* js_Vector_h */