class CParent{};
class CChild1 : virtual public CParent{};
class CChild2 : virtual public CParent{};
class CMultiple: public CChild1, public CChild2{};

void main()
{
	CMultiple m;
	CChild1 c1;
	CChild2 c2;

	CParent* p;
	p = &c1;
	p = &c2;
	p = &m; 
	//with out virtual inheritance in CChild1 & CChild2 the following error occures
	//error C2594: '=' : ambiguous conversions from 'CMultiple *__w64 ' to 'CParent *'
}