13 variant<::std::reference_wrapper<::ClientNetworkSystem>, ::std::reference_wrapper<::ServerNetworkSystem>> {
17 variant<::std::reference_wrapper<::ClientNetworkSystem>, ::std::reference_wrapper<::ServerNetworkSystem>>;
19 using ClientRefT = ::std::reference_wrapper<::ClientNetworkSystem>;
21 using ServerRefT = ::std::reference_wrapper<::ServerNetworkSystem>;