c++ - Use of undefined identifier ? Pointer to function -

i have compile error , don't know why. here's header code :

file: authsession.hpp

class authsession : public player,   public boost::enable_shared_from_this<authsession> { public:     authsession(boost::asio::io_service& io_service, playerlist& player_list)     : socket_(io_service),     player_list_(player_list)     {     }      ~authsession(){     }     //some functions }; 

file : opcodes.hpp

#include "../player/authsession.hpp"  struct opcodehandler {     char const* name;     sessionstatus status;     void (authsession::*handler)(authmessage& recvpacket); //error here : undefined authsession }; 

my file large, removed unnecessary code.. can me?