Illustration of deep copy

deep_copy.cpp

#include<iostream>
using namespace std;

class A
{
public:
  int x;
  A(int v):x(v) {}
};

class B
{
public:
  A * aref;
  B (A* a) {
    this->aref= a;
  }
  B(const B& B1) {
    if (B1.aref) {
      aref = new A(B1.aref->x);
    }
    else
      aref = NULL;
  }
  B& operator=(const B& B1) {
    if (this == &B1)
      return *this;
    if (B1.aref) {
      aref = new A(B1.aref->x);
    }
    else
      aref = NULL;

  }
  friend ostream& operator<<(ostream& cout, const B& b1)
  {
    cout<<"address of B object:"<<&b1<<endl;
    cout<<"aref of B object:"<<b1.aref<<endl;
    cout<<"aref->x of B object:"<<b1.aref->x<<endl;
  }
};


int main()
{
  A a(15);
  B b(&a);
  B c(b);
  B d = c;
  cout<<"a"<<endl;
  cout<<&a<<" "<<a.x<<endl;
  cout<<"b"<<endl;
  cout<<b;
  cout<<"c"<<endl;
  cout<<c;
  cout<<"d"<<endl;
  cout<<d;
  return 0;
}