Destructing derived class by deleting base class

Question

I have a situation that looks like the following code:

#include 

class A
{
public:
    A() { std::cout << \"A created!\" << std::end         


        

Answer 1

If you apply operator "delete" to base class pointer, destructor MUST be virtual (existence of other virtual methods does not matter). For instance, in case of multiple inheritance "delete" operator applied to base class pointer will cause memory fault since compiler doesn't even know were the memory occupied by derived object begins.