final class in c++

Question

class Temp
{
private:
    ~Temp() {}
    friend class Final;
};

class Final : virtual public Temp
{
public:
     void fun()
     {
         cout<<\"In base\";         


        

Answer 1

Curiously recurring template pattern. Use private inheritence.

template< typename T > class Final
{
protected:
    Final() {}
    Final( Final const& ) {}
};

class X : private virtual Final
{
  // whatever I want to do
};

and you should find it impossible to derive anything from X because the virtual inheritence means that the most-derived class must construct the base class but it won't have any access to it.

(I haven't tested this code).