c++ - Which function calls are not resolved at compile time in object oriented programming? -

which function calls resolved @ compile time , ones @ runtime? read somewhere not function calls resolved @ compile time dont know which.

virtual function calling mechanisms resolved @ run-time. because, in c++, pointer derived class type-compatible pointer base class. so, call virtual function, actual type of constructed object( or actual under lying object ) base class pointer pointing must known, can resolved @ runtime.

struct foo {      virtual void virtualmethod()      {           cout<< " \n virtualmethod of foo \n";      }       void normalmethod()      {           cout<< " \n normalmethod of foo \n";      }      virtual ~foo() {} };  struct bar: public foo {      void virtualmethod()      {          cout<< " \n virtualmethod of bar \n";      }      void normalmethod()      {           cout<< " \n normalmethod of bar \n";      }      ~bar() {} };  foo* obj = new bar ; obj->virtualmethod() ; 

now, since virtualmethod() needs called depends on run time type( or actual under lying object ) obj pointing because obj can pointed object constructed either new foo or new bar. @ run-time, know that obj constructed objected type returned bar*, corresponding virtual function of derived class called, if exists. else base class virtual function called.

obj->normalmethod(); 

this method can resolved @ compile time because it's normal member function.

results: ideone results link