dom/ipc/IdType.h
author Mats Palmgren <mats@mozilla.com>
Fri, 21 Apr 2017 02:24:19 +0200
changeset 396017 40bd1b4eb78c562a91b7b80e9200eaeb23867245
parent 340377 63f6395614e8085c33d552e8c56e312df5c763a3
child 486570 c70a61e3f34ace5748837cbf6d174587093c0fd9
permissions -rw-r--r--
Bug 1357655 - Part 2: [css-ui] Add an explicit 'appearance:auto' to a couple of reftest that needs it. a=gchang MozReview-Commit-ID: 82ANStMIm5z

/* -*- 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