A.h

#ifndef A_H
#define A_H

#include <iostream>

class A {
    int* a;
    public:
        A() : a(NULL) {
            std::cout << "Called Default Constructor" << std::endl;
            a = new int(10);
        }
        ~A() {
            std::cout << "Called Destructor" << std::endl;
            delete a;
        }
        A(const A& other) : a(NULL) {
            std::cout << "Called Copy Constructor" << std::endl;
            a = new int(*(other.a));
        }
        A(A&& old) : a(NULL) {
            std::cout << "Called Move Constructor" << std::endl;
            a = old.a;
            old.a = NULL;
        }
        A& operator=(const A& other) {
            // Self Assignment:
            // int a = rand();
            // a = a; // This is self assignment
            if(this != &other) {
                std::cout << "Called Copy Assignment" << std::endl;
                delete a;
                a = new int(*(other.a));
            }
            return *this; // This is standard
            // int a = rand();
            // int b, c;
            // c = b = a;
        }
        A& operator=(A&& old) {
            if(this != &old) {
                std::cout << "Called Move Assignment" << std::endl;
                delete a;
                a = old.a;
                old.a = NULL;
            }
            return *this;
        }
        friend std::ostream& operator<<(std::ostream& os, const A& obj);
};

std::ostream& operator<<(std::ostream& os, const A& obj) {
    return os << obj.a << "   " << *(obj.a);
}

#endif