How can I hide a class in C++?

Question

Let\'s say I have 2 classes that I want to be visible (within a given header file) and one class that is their ancestor, which one I want to be visible only to the previousl

Answer 1

A variation of Anonymous answer, instead of private inheritance you can add private member of the hidden class.

class Hidden
{
   private:
      friend class Exposed;
      Hidden() {}
      int hidden_x;
};

class Exposed
{
  public:
      Exposed() {}
      void DoStuff() { printf( "%d" , hidden.hidden_x ); }
  private:
      Hidden hidden_;
};