#ifndef DERIVED_C
#define DERIVED_C

//#define OVER_RIDE_FOO_IN_DERIVED_C

#include "BaseA.h"
#include "VirtualBaseD.h"

class CDerivedC:public CBaseA, public CVirtualBaseD
{
	public:
#ifdef OVER_RIDE_FOO_IN_DERIVED_C
		virtual void foo();
#endif
		//...
	private:
		//...
};

#ifdef OVER_RIDE_FOO_IN_DERIVED_C

void CDerivedC::foo()
{
	cout << "This is the foo of Derived Class C" << endl;
}

#endif

#endif