Перегрузка оператора присваивания

#include <iostream>
using std::cout;
 
class Circle {
public:
 
    //constructors
    Circle() : itsRadius(new int(5)) { cout << "Default constructor called\n"; }
    Circle(int radius) : itsRadius(new int(radius)) { cout << "Overloaded constructor called\n"; }
    Circle(const Circle&);
    ~Circle() { 
        delete itsRadius;
        itsRadius = 0;
    }
 
    //access methods
    int GetRadius() const { return *itsRadius;  }
    void SetRadius(int radius) { *itsRadius = radius; }
 
    //overloaded operators
    Circle& operator++();
    Circle operator++(int);
    Circle& operator=(Circle&);
 
private:
    int* itsRadius;
 
};
 
Circle& Circle::operator++() {
    ++(*itsRadius);
    return *this;
}
 
Circle Circle::operator++(int x) {
    Circle temp(*this);
    (*itsRadius)++;
    return temp;
}
 
Circle& Circle::operator=(Circle& rhs) {
    if (this == &rhs)
        return *this;
    *itsRadius = rhs.GetRadius();
    return *this;
}
 
Circle::Circle(const Circle& rhs) {
    cout << "Copy constructor called\n";
    itsRadius = new int;
    *itsRadius = rhs.GetRadius();
}
 
int main() {
 
    Circle FirstCircle;
    Circle SecondCircle(10);
 
    cout << "Radius of FirstCircle is " << FirstCircle.GetRadius() << "\n";
    cout << "Radius os SecondCircle is " << SecondCircle.GetRadius() << "\n";
 
    cout << "using preincrement\n";
    Circle First = ++FirstCircle;
    Circle Second = ++SecondCircle;
    cout << "Radius of FirstCircle is " << FirstCircle.GetRadius() << "\n";
    cout << "And Radius of First is " << First.GetRadius() << "\n";
    cout << "Radius of SecondCircle is " << SecondCircle.GetRadius() << "\n";
    cout << "And Radius of Second is " << Second.GetRadius() << "\n";
 
    cout << "using postincrement\n";
    First = FirstCircle++;
    Second = SecondCircle++;
 
    Circle a = FirstCircle++;
    SecondCircle = FirstCircle;
 
}

Circle& Circle::operator=(const Circle& rhs)
...
Circle& Circle::operator=(const Circle& rhs) {
    if (this == &rhs)
        return *this;
    *itsRadius = rhs.GetRadius();
    return *this;
}