C / C++ / MFC

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class CBase 
{
private:
  virtual void P() { printf("CBase::P\n"); }
public:
  void F() { printf("Base: F()->P(): "), P(); }
};
 
class C1 : public CBase
{
  private:
    virtual void P() override { printf("C1::P\n"); }
};
class C2 : public C1
{
  private:
    virtual void P() override { printf("C2::P\n"); }
};
 
void main()
{
  CBase* p = new CBase();
  p->F();
  p = new C1();
  p->F();
  p = new C2();
  p->F();
}

class C1 : public CBase
{
  private:
    //virtual void P() override { printf("C1::P\n"); }
};

struct PI
{
  virtual void P() abstract;
};
 
class CBase : public PI
{
private:
  virtual void P() { printf("CBase::P\n"); }
public:
  void F() { printf("Base: F()->P(): "), P(); }
};
 
class C1 : public CBase, public PI
{
  private:
    virtual void P() override { printf("C1::P\n"); }
};
class C2 : public C1, public PI
{
  private:
    virtual void P() override { printf("C2::P\n"); }
};