1 files changed, 73 insertions, 0 deletions
diff --git a/dom/ipc/IdType.h b/dom/ipc/IdType.h
new file mode 100644
index 000000000..b683178eb
--- /dev/null
+++ b/dom/ipc/IdType.h
@@ -0,0 +1,73 @@
+/* -*- 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 mozilla_dom_IdType_h
+#define mozilla_dom_IdType_h
+
+#include "ipc/IPCMessageUtils.h"
+
+namespace IPC {
+template<typename T> struct ParamTraits;
+} // namespace IPC
+
+namespace mozilla {
+namespace dom {
+class ContentParent;
+class TabParent;
+
+
+template<typename T>
+class IdType
+{
+  friend struct IPC::ParamTraits<IdType<T>>;
+
+public:
+  IdType() : mId(0) {}
+  explicit IdType(uint64_t aId) : mId(aId) {}
+
+  operator uint64_t() const { return mId; }
+
+  IdType& operator=(uint64_t aId)
+  {
+    mId = aId;
+    return *this;
+  }
+
+  bool operator<(const IdType& rhs)
+  {
+    return mId < rhs.mId;
+  }
+private:
+  uint64_t mId;
+};
+
+typedef IdType<TabParent> TabId;
+typedef IdType<ContentParent> ContentParentId;
+
+} // namespace dom
+} // namespace mozilla
+
+namespace IPC {
+
+template<typename T>
+struct ParamTraits<mozilla::dom::IdType<T>>
+{
+  typedef mozilla::dom::IdType<T> paramType;
+
+  static void Write(Message* aMsg, const paramType& aParam)
+  {
+    WriteParam(aMsg, aParam.mId);
+  }
+
+  static bool Read(const Message* aMsg, PickleIterator* aIter, paramType* aResult)
+  {
+    return ReadParam(aMsg, aIter, &aResult->mId);
+  }
+};
+
+} // namespace IPC
+
+#endif // mozilla_dom_IdType_h