//**********************
//**    ch17_4.cpp    **
//**********************

#include<iostream.h>

class OBJ1{
public:
  OBJ1(){ cout <<"OBJ1\n"; }
};

class OBJ2{
public:
  OBJ2(){ cout <<"OBJ2\n"; }
};

class Base1{
public:
  Base1(){ cout <<"Base1\n"; }
};

class Base2{
public:
  Base2(){ cout <<"Base2\n"; }
};

class Base3{
public:
  Base3(){ cout <<"Base3\n"; }
};

class Base4{
public:
  Base4(){ cout <<"Base4\n"; }
};

class Derived :public Base1, virtual public Base2,
public Base3, virtual public Base4{
public:
  Derived() :Base4(), Base3(), Base2(), Base1(), obj2(), obj1()
  {
    cout <<"Derived ok.\n";
  }
protected:
  OBJ1 obj1;
  OBJ2 obj2;
};

void main()
{
  Derived aa;
  cout <<"This is ok.\n";
}