C++ Quiz #2

This is a test of your knowledge of C++, not of your compiler’s knowledge of C++. Using a compiler during this test will likely give you the wrong answers, or at least incomplete ones.

1. Using the code below as a reference, explain what behavior should be expected of each of the commented lines, please keep your answer very short.

struct Base {
	virtual void Arr();
};
struct SubBase1 : virtual Base {
};
struct SubBase2 : virtual Base {
	SubBase2(Base*, SubBase1*);
	virtual void Arr();
};
struct Derived : SubBase1, SubBase2 {
	Derived() : SubBase2((SubBase1*)this, this) {
	}
};

SubBase2::SubBase2(Base* a, SubBase1* b) {
	typeid(*a);                 //1
	dynamic_cast(a); //2
	typeid(*b);                 //3
	dynamic_cast(b); //4
	a->Arr();                   //5
	b->Arr();                   //6
}

2. Using the code below as a reference, explain what behavior should be expected of each of the commented lines?

template class X {
	X* p;  //1
	X a;  //2
};