不理解输出结果，请帮帮我

Question

#include <iostream>
using namespace std;

class Base {
public:
     ~Base();
};
Base::~Base() {
    cout << "Base destructor" << endl;
}

class Derived : public Base {
public:
    Derived();
    ~Derived();
private:
    int* p;
};

Derived::Derived() {
    p = new int(0);
}

Derived::~Derived() {
    cout << "Derived destructor" << endl;
    delete p;
}

void fun(Base* b) {
    delete b; //只执行基类析构
}

int main() {
    Base* b = new Derived();
    fun(b);
    Base b1 = Derived();
    return 0;
}

输出结果最后为什么两个Base destructor

Answer 1

确保基类析构函数被正确调用，使用virtual关键字。

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