How to use member as object of other class? - c++

Question

I want to create member variable sptr of ABC which is object of other class SmartPointer. And then assign value to that member variable.
#include<stdio.h>
#include<iostream>
using namespace std;
class SmartPointer
{
private:
int *ptr;
public:
SmartPointer(int *p);
int& operator *();
~SmartPointer();
};
SmartPointer::SmartPointer(int *p = NULL)
{
cout<<"Initilaize SmartPointer"<<p<< endl;
ptr = p;
}
int& SmartPointer:: operator *()
{
return *ptr;
}
SmartPointer::~SmartPointer()
{
cout<<"De-Initilaize SmartPointer"<<endl;
delete ptr;
}
class ABC
{
private:
int a;
SmartPointer *sptr;
int ref;
public:
ABC(); // Simple constructor.
ABC(int a, int b); // Parameterized constructor.
// ABC(const ABC &obj); // Copy constructor.
~ABC(); // Destructor.
void display(); // Display.
// ABC& operator=(const ABC &obj); // Operator Overload.
};
ABC::ABC()
{
ref= 1;
}
ABC::ABC(int a, int b)
{
cout << "Parameterized constructor input" << endl;
// allocate memory for the pointer;
sptr = new SmartPointer(&a);
cout << "Parameterized constructor Out"<<sptr << endl;
}
ABC::~ABC(void)
{
cout << "Freeing memory!" << endl;
ref --;
if(ref==0)
{
//delete sptr;
}
}
void ABC::display()
{
}
int main()
{
// int a = 10;
// SmartPointer obj1(&a);
// Normal.
ABC obj2(1, 2);
return 0;
}
created sptr = new SmartPointer(&a);, but how to get value of sptr ?