- add<Packet1>()(&Packet1::value);
- add<Packet2>()(&Packet2::value);
- add<Packet3>()(&Packet3::values);
- add<Packet4>()(&Packet4::sub1)(&Packet4::sub2);
+ add<Packet1>(&Packet1::value);
+ add<Packet2>(&Packet2::value);
+ add<Packet3>(&Packet3::values);
+ add<Packet4>(&Packet4::sub1, &Packet4::sub2);