关于#c++ 虚函数指针#的问题：同样的写法vs2015可以vs2022不行为啥

Question

同样的写法 vs2015 可以 vs2022 不行 为啥？

#include<iostream>
using namespace std;
typedef int(*fp)();
class  classA
{
public:
    virtual int func() {
        cout << "classA" << endl;
        return 0;
    }
};

class classB :public classA {
public:
    int func() {
        cout << "classB" << endl;
        return 0;
    }
};
int main() {
    classB classp;
    int* pi = (int*)&classp;
    int* pi2 = (int*)*pi;
    fp funcp = (fp)*pi2;
    funcp();
    system("pause");
    return 0;
}

Answer 1

int -> long long