#include <iostream>
using std::cout; using std::endl;
 
class Base1
{
public:
  virtual void func1() = 0;
};
 
class Base2
{
public:
  virtual void func1();
};
 
void Base2::func1()
{
  cout << "Base2::func1()" << endl;
}
 
class Derived1 : public Base1, public Base2
{
public:
};
 
class Derived2 : public Base1
{
public:
  virtual void func1();
private:
  Base2 m_base2;
};
 
void Derived2::func1()
{
  m_base2.func1();
}
 
int main()
{
//  Derived1 d1;
//  d1.func1();
  Derived2 d2;
  d2.func1();
}
 

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