C / C++ / MFC

AnShUmAn_VCPP wrote:

The Operating system calls a callback function as it receives WM_TIMER message time and again

class Base {
public:
	virtual void vvfunc() {}
};

class Derived : public Base {};

using namespace std;
int main()
{	
  Derived* pd = new Derived;
  Base* pb = pd;
  Base b;	
  cout << typeid( b ).name() << endl;   //prints "class Base *"
  cout << typeid( pb ).name() << endl;   //prints "class Base *"
  cout << typeid( pb ).name() << endl;   //prints "class Derived"
  cout << typeid( pd ).name() << endl;   //prints "class Derived *"
  cout << typeid( pd ).name() << endl;   //prints "class Derived"
  delete pd;
}

Divick wrote:

class DllMethods
{
public:
__declspec(dllexport) static int data;
__declspec(dllexport) static fptr function;
};

class __declspec(dllexport) DllMethods
{
public:
static int data;
static fptr function;
};

class __declspec(dllimport) DllMethods
{
public:
static int data;
static fptr function;
};

#ifdef INDLL
#define LIBSPEC __declspec(dllexport)
#else
#define LIBSPEC __declspec(dllimport)
#endif

class LIBSPEC DllMethods
{
public:
static int data;
static fptr function;
};