#include <iostream>

using namespace std;

class A
{
public:
  A ( void );
  void SetA ( int );
private:
  int a;
};
A::A ( void ) : a ( 0 )
{
}
void A::SetA ( int va )
{
  a = va;
}

class B1 : public virtual A  //遵循1
{
public:
  B1 ( void );
  void SetB1 ( int );
private:
  int b1;
};
B1::B1 ( void ) : A ( ), b1 ( 0 )
{
}
void B1::SetB1 ( int vb )
{
  b1 = vb;
  SetA ( b1 + 1 );
}

class B2 : public virtual A  //遵循2
{
public:
  B2 ( void );
  void SetB2 ( int );
private:
  int b2;
};
B2::B2 ( void ) : A ( ), b2 ( 0 )
{
}
void B2::SetB2 ( int vb )
{
  b2 = vb;
  SetA ( b2 + 2 );
}

class D : public B1, public B2
{
public:
  D ( void );
private:
  int d;
};
D::D ( void ) : B1 ( ), B2 ( ), d ( 0 )
{
}

int main ( void )
{
  D thed;

  thed.SetB1 ( 1 );
  thed.SetB2 ( 2 );

  return ( 0 );
}