dom/ipc/IdType.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef mozilla_dom_IdType_h
   8 #define mozilla_dom_IdType_h
   9
  10 #include "ipc/IPCMessageUtils.h"
  11
  12 namespace IPC {
  13 template <typename T>
  14 struct ParamTraits;
  15 }  // namespace IPC
  16
  17 namespace mozilla {
  18 namespace dom {
  19 class BrowsingContext;
  20 class ContentParent;
  21 class BrowserParent;
  22
  23 template <typename T>
  24 class IdType {
  25   friend struct IPC::ParamTraits<IdType<T>>;
  26
  27  public:
  28   IdType() : mId(0) {}
  29   explicit IdType(uint64_t aId) : mId(aId) {}
  30
  31   operator uint64_t() const { return mId; }
  32
  33   IdType& operator=(uint64_t aId) {
  34     mId = aId;
  35     return *this;
  36   }
  37
  38   bool operator<(const IdType& rhs) { return mId < rhs.mId; }
  39
  40  private:
  41   uint64_t mId;
  42 };
  43
  44 using TabId = IdType<BrowserParent>;
  45 using ContentParentId = IdType<ContentParent>;
  46 }  // namespace dom
  47 }  // namespace mozilla
  48
  49 namespace IPC {
  50
  51 template <typename T>
  52 struct ParamTraits<mozilla::dom::IdType<T>> {
  53   using paramType = mozilla::dom::IdType<T>;
  54
  55   static void Write(Message* aMsg, const paramType& aParam) {
  56     WriteParam(aMsg, aParam.mId);
  57   }
  58
  59   static bool Read(const Message* aMsg, PickleIterator* aIter,
  60                    paramType* aResult) {
  61     return ReadParam(aMsg, aIter, &aResult->mId);
  62   }
  63 };
  64
  65 }  // namespace IPC
  66
  67 #endif  // mozilla_dom_IdType_h