Method IterateFields

internal/json.cc:1600–1604

  }

  JsonMapIterator IterateFields(
      const google::protobuf::MessageLite& message) const override {
    return reflection_.Struct().BeginFields(
        google::protobuf::DownCastMessage<google::protobuf::Message>(message));
  }

 private:
  JsonReflection reflection_;