C++ Object Pointer

Question

I need some help here, could you tell me how I can get p2 variable content? I can get variables through t1 and p1 but I want to use p2 to get health and mana values.

#include <iostream>

using namespace std;

class Mage{
public:
    int health;
    int mana;
    Mage(int health, int mana){
        this->health = health;
        this->mana = mana;
    }
};

int main(){

    Mage t1 = Mage(1,1);
    Mage *p1 = &t1;
    Mage **p2 = &p1;

    cout << t1.health << endl;
    cout << p1->health << endl;
    cout << "how to print variable content with p2?" << endl;

    return 0;
}

Answer 1

Use

cout << (*p2)->health << endl;

The * has two meanings: to declare a pointer and to dereference a pointer. But since -> has higher precedence than * you need to put *p2 into backets.

Answer 2

Your example suggests that you are looking for a single operator that dereferences two times at once. There is none in C++.

Two ways to achieve what you want. The first has already been mentioned and goes

std::cout << (*p2)->health << std::endl;

The second can be found by noting that p1->health is equivalent to (*p1).health . Hence, (*p2)->health is equivalent to (**p2).health . In a row:

std::cout << t1.health << std::endl;
std::cout << (*p1).health << std::endl;
std::cout << (**p2).health << std::endl;