Passing a derived class into a map c++ -

what place manager map, , call functions correlating each manager. because have different types of managers created base class so:

class igyromanager { public:     igyromanager() {}     virtual ~igyromanager() = default;      virtual bool preinit() = 0;      virtual bool init() = 0;      virtual bool postinit() = 0;      virtual void update() = 0;      virtual void cleanup() = 0; } 

pretty straight forward , works charm.

then following create derived class:

class gyroaudiomanager : public igyromanager { public:     gyroaudiomanager();     ~gyroaudiomanager() override;      bool preinit() override;      bool init() override;      bool postinit override;      void update() override;      bool cleanup() override; } 

again, simple , straight forward. cpp basic , declares bare functions.

i create 1 final derived class:

class gyroappstatemanager : igyromanager { private:     std::map<int, igyromanager&> m_managermap;  public:     gyroappstatemanager();     ~gyroappstatemanager() override;      bool preinit() override;      bool init() override;      bool postinit() override;      int start();      void update() override;      bool registermanager(igyromanager& manager);      bool cleanup() override; } 

that seems work, it's in registermanager function falls apart:

bool gyroappstatemanager::registermanager(igyromanager& manager) {     // try insert derived class base class map using     // should working.     m_managermap.insert(1, manager);      return true; } 

and in calling function:

int start() {     gyroaudiomanager m_audiomanager = gyroaudiomanager();      mp_appstatemanager->registermanager(m_audiomanager);       /* use mp_appstatemanager here, while m_audiomanager alive */ } 

except not seem work @ , spits out following:

error: no matching function call std::map<int, igyromanager&>::insert(int, igyromanager&) 

so question doing wrong? mentioned above, i'd add multiple different manager classes derive single base class map , able run functions it.

is there way of doing it?

you can't have standard container of references. i'm still looking exact wording of restriction, in meantime might want try std::reference_wrapper instead, or container of (smart) pointers, allows polymorphism.

actually, value_type std::pair<key_type, mapped_type> object type when mapped_type reference. that's ok.

the error caused because parameter std::map<key,value>::insert pair<key,value>, not 2 separate arguments. try

m_managermap.insert({1, manager}); 

but need arrange reference object isn't destroyed afterward, when start() returns.