- PacketDefBuilder<PacketHeader, NullSerializer<PacketHeader> >(*this, header_def, NullSerializer<PacketHeader>())
- (&PacketHeader::type)(&PacketHeader::length);
+ PacketDefBuilder<PacketHeader, Serializer<PacketHeader>>(*this, header_def, Serializer<PacketHeader>())
+ .fields(&PacketHeader::type, &PacketHeader::length);