Access Violation

 0: #include "iostream"
1:
2: class base
3: {
4: public:
5:     base()
6:     {
7:         std::cout << "[C++] In 'base' constructor I'm: ";
8:         WhoAmI();
9:     }
10:   
11:     virtual ~base()
12:     {
13:         std::cout << "[C++] In 'base' destructor I'm: ";
14:         WhoAmI();
15:     }
16:   
17:     virtual void WhoAmI() const
18:     {
19:         std::cout << "base" << std::endl;
20:     }
21: };
22:
23: class derived : public base
24: {
25: public:
26:     virtual void WhoAmI() const
27:     {
28:         std::cout << "derived" << std::endl;
29:     }
30: };
31:
32: void main()
33: {
34:     derived x;
35: }