#include <iostream>
using namespace std;
 
struct B 
{
	int b;
	virtual ~B() {};
	virtual void show() { std::cout << "B::show();\n"; };
};
 
struct X: virtual public B
{
	int x;
};
 
struct Y: virtual public B
{
	int y;
};
 
struct C: virtual public X, virtual public Y
{
	/*virtual*/ void show() { std::cout << "C::show()\n"; };
};
 
typedef void* lParam;
 
void showMeC( lParam lp )
{
	C *self = (C*) lp;
	self->show();
}
 
int main() {
	C *c = new C;
	showMeC( c );
	delete c;
	return 0;
}

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