#include <iostream>
#include <vector>

using namespace std;

class A {

public:

        bool *var;


void f (bool *var) {

 this->var = var;

}
void f2 () {

   this->var = false;

}

};


int main () {


bool var = true;

cout << var << endl;
A obj;

//pass a reference of var to function f
obj.f(&var);
//alter var using the function f2
obj.f2();


//output altered var, which doesn't happen ;)
cout << var << endl;

return 0;
}