1 files changed, 59 insertions, 0 deletions
diff --git a/dom/bindings/RootedRefPtr.h b/dom/bindings/RootedRefPtr.h
new file mode 100644
index 000000000..e27361b24
--- /dev/null
+++ b/dom/bindings/RootedRefPtr.h
@@ -0,0 +1,59 @@
+/* -*- 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/. */
+
+/**
+ * An implementation of Rooted for RefPtr<T>.  This works by assuming that T has
+ * a Trace() method defined on it which will trace whatever things inside the T
+ * instance need tracing.
+ *
+ * This implementation has one serious drawback: operator= doesn't work right
+ * because it's declared on Rooted directly and expects the type Rooted is
+ * templated over.
+ */
+
+#ifndef mozilla_RootedRefPtr_h__
+#define mozilla_RootedRefPtr_h__
+
+#include "mozilla/RefPtr.h"
+#include "js/GCPolicyAPI.h"
+#include "js/RootingAPI.h"
+
+namespace JS {
+template<typename T>
+struct GCPolicy<RefPtr<T>>
+{
+  static RefPtr<T> initial() {
+    return RefPtr<T>();
+  }
+
+  static void trace(JSTracer* trc, RefPtr<T>* tp, const char* name)
+  {
+    if (*tp) {
+      (*tp)->Trace(trc);
+    }
+  }
+};
+} // namespace JS
+
+namespace js {
+template<typename T>
+struct RootedBase<RefPtr<T>>
+{
+  operator RefPtr<T>& () const
+  {
+    auto& self = *static_cast<const JS::Rooted<RefPtr<T>>*>(this);
+    return self.get();
+  }
+
+  operator T*() const
+  {
+    auto& self = *static_cast<const JS::Rooted<RefPtr<T>>*>(this);
+    return self.get();
+  }
+};
+} // namespace js
+
+#endif /* mozilla_RootedRefPtr_h__ */