#define SYNC_DATA_CB list<string> (*syncData)(void)

SyncProcess{
  public:
   SyncProcess(SYNC_DATA_CB);
   static SYNC_DATA_CB sync_cb_;
}

typedef list<string>(*syncData)(void);

class SyncProcess{
  public:
   SyncProcess( syncData );
   static syncData sync_cb_;
};

std::function<list<string> (void)> myPointer;

class SyncProcess
{
public:

   // Typedef to create function pointer alias SyncDataFunc
   typedef list<string>(*SyncDataFunc)();

   // Use alias as input parameter type
   SyncProcess(SyncDataFunc func);

   // Use alias as static member type
   static SyncDataFunc sync_cb_;
};