c++ 获取对象地址和从地址获取对象

#include <iostream>
using namespace std;

int main()
{
    const char* a = "I am the data";
    long long addr = (long long)(std::addressof(a));
    cout << "address of a:" << addr << endl;
    const char* b = *(const char**)addr;
    cout << "b:" << b << endl;
    return 0;
}