C++删除指向指针的指针

#include<iostream>

int main() {
    int* p1 = new int(42);
    int** p2 = &p1;

    std::cout << "Value of p1: " << *p1<< std::endl;
    std::cout << "Value of p2: " << **p2<< std::endl;

    delete p1;
    p1 = nullptr;

    std::cout << "Value of p1 after deletion: " << p1 << std::endl;
    std::cout << "Value of p2 after deletion: " << *p2<< std::endl;

    return 0;
}