有如下程序段： #include <iostream>
using namespace std;
class A {
public:
~A() { cout << "~A()"; }
};
class B {
public:
virtual ~B() { cout << "~B()"; }
};
class C : public A, public B {
public:
~C() { cout << "~C()"; }
};
int main() {
C *c = new C;
B *b1 = dynamic_cast(c);
A *a2 = dynamic_cast(b1);
delete a2;
}
则程序输出：