Question

The code below introduces a class C. The class has constructor, copy constructor, operator= and one member. How can I get the address of the object created by C(2) in the function main()?

#include <iostream>

class C
{
public:
    int a;

    C(const C &other)
    {   
        std::cout << "Copy Constructor:" << a << std::endl;
    }   

    C(int a)
    {   
        this->a = a;
        std::cout << "Constructor:" << a << std::endl;
    }   

    C &operator=(const C &other)
    {   
        std::cout << "operator=:this.a = " << a << " | other.a = " << other.a << std::endl;
        a = other.a;
        return *this;
    }   

    ~C()
    {   
        std::cout << "Destructor:" << a << std::endl;
    }   
};

    int main()
    {
        C a(1);

        a = C(2);
    }

Answer 1

You can’t. You are forbidden from taking addresses of temporaries. They will go out of scope very quickly, leaving you with an invalid address.