6. Explicitly disallow the use of compiler generated functions you do not want

declaring member functions private and deliberately not implementing them

class HomeForSale {
public:
    ...
private：
    ...
    HomeForSale(const HomeForSale&);
    HomeForSale& operator=(const HomeForSale&);
};  

declaring the copy constructor and copy assignment operator private not in HomeForSale itself, but in a base class

class Uncopyable {
protected:
    Uncopyable() {}
    ~Uncopyable() {}
private:
    Uncopyable(const Uncopyable&);
    Uncopyable& operator=(const Uncopyable&);
};

class HomeForSale: private Uncopyable {
    ...
};

Uncopyable is not designed to allow the manipulation of derived class objects via base class interfaces. As a result, they do not need virtual destructor.