C++——虚函数表与多态（派生类内存布局）

class A {
public:
	A() {
		c();
	}
	virtual ~A() {
		d();
	}
	virtual void c() {
		cout << "Construct A\n";
	}
	virtual void d() {
		cout << "Deconstruct A\n";
	}
};
class B : public A {
public:
	B() {           // 等价于 B() : A(){}
		c();
	}
	~B() {
		d();
	}
	void c()override {
		cout << "Construct B\n";
	}
	void d()override {
		cout << "Deconstruct B\n";
	}
};
int main() {
	B b;
    return 0;
}

Construct A
Construct B
Deconstruct B
Deconstruct A