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::dom {
  18 class BrowsingContext;
  19 class ContentParent;
  20 class BrowserParent;
  21
  22 template <typename T>
  23 class IdType {
  24   friend struct IPC::ParamTraits<IdType<T>>;
  25
  26  public:
  27   IdType() : mId(0) {}
  28   explicit IdType(uint64_t aId) : mId(aId) {}
  29
  30   operator uint64_t() const { return mId; }
  31
  32   IdType& operator=(uint64_t aId) {
  33     mId = aId;
  34     return *this;
  35   }
  36
  37   bool operator<(const IdType& rhs) { return mId < rhs.mId; }
  38
  39  private:
  40   uint64_t mId;
  41 };
  42
  43 using TabId = IdType<BrowserParent>;
  44 using ContentParentId = IdType<ContentParent>;
  45 }  // namespace mozilla::dom
  46
  47 namespace IPC {
  48
  49 template <typename T>
  50 struct ParamTraits<mozilla::dom::IdType<T>> {
  51   using paramType = mozilla::dom::IdType<T>;
  52
  53   static void Write(MessageWriter* aWriter, const paramType& aParam) {
  54     WriteParam(aWriter, aParam.mId);
  55   }
  56
  57   static bool Read(MessageReader* aReader, paramType* aResult) {
  58     return ReadParam(aReader, &aResult->mId);
  59   }
  60 };
  61
  62 }  // namespace IPC
  63
  64 #endif  // mozilla_dom_IdType_h