#include <iostream>

#include <string>

#include <vector>

class Demo {

public:

int age;

};

void copy_test(Demo** p_demo, Demo demo) {

/*

p_demo->age = demo.age;

demo.age = 100;

*/

Demo* demo_1 = new Demo();

demo_1->age = 100;

*p_demo = demo_1;

}

int main(int argc, char* argv[]) {

Demo* p_demo = new Demo();

Demo demo;

demo.age = 10;

copy_test(&p_demo, demo);

std::cout << p_demo->age << std::endl;

return 0;

}