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Need help on dynamic_cast

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Neon2302    122
This is the code class NetworkMessage { public : NetworkMessage(){ } DDWord messageID; SOCKET sender; std::string message; }; class NetworkLoginMessage : public NetworkMessage { public : NetworkLoginMessage(): NetworkMessage(){ } std::string username; std::string password; }; This is the use of Object std::vector<DDByte> processMessage(NetworkMessage* message){ NetworkLoginMessage* nlm = dynamic_cast<NetworkLoginMessage *>(message); } The error is error C2683: 'dynamic_cast' : 'NetworkMessage' is not a polymorphic type Anyone have an idea on this error pleaseee Thank you Chet Chetchaiyan

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