C / C++ / MFC

Mr Simple wrote:

I have included 'WinIOCtl.h' as specified in the MSDN docs.

#if(_WIN32_WINNT >= 0x500)

Requirements

George_George wrote:

...and the foo in Final is not virtual method;

Final

class Base {
public:
  // remove virtual here
    int foo() {cout << "Base" << endl; return 0;}
};
 
class Derived: public Base
{
public:
// place function virtual in derived
    virtual int foo() {cout << "Derived" << endl;return 0;}
};
 
class Final: public Derived{
public:
  int foo() {cout << "Final" << endl;return 0;}
};

int main()
{
  Final objF;

  objF.foo();

  Derived* pDer = dynamic_cast<Derived*>(&objF);
  if(pDer) pDer->foo();

  Base* pBase = dynamic_cast<Base*>(&objF);
  if(pBase) pBase->>foo();
}

George_George wrote:

2. if function is virtual, we should invoke the foo based on the type of instance pointed to, if not virtual, we should invoke the foo based on the type which is the pionter type;