Thread: Virtual & Pure virtual destructors

I am a little confused about virtual and pure virtual destructors. Why and when they are used? Can I get a good explanation for needing them? (I hope that's not too much to ask )

Anyway, all I know is that the following code will crash; can someone explain why? And why do I need to use virtual destructors to correct it?

Code:

class A
{
public:
	~A() {}
	int a;
};

class B
{
public:
	~B() {}
	int b;
};

class C : public A, public B
{
};

int main()
{
	A* ap = new C;
	delete ap;
	B* bp = new C;
	delete bp;

	return 0;
}

And if you can, I'm just curious about what a 'pure virtual destructor' is

Meh?