An example code

// lOp.cpp : コンソール アプリケーションのエントリ ポイントを定義します。
//

#include "stdafx.h"
#include <stdio.h>

class X {
public:
 X(int a) {fprintf(stdout, "X is created. %d/n", a);}
};

class Y {
public:
 Y(int b) {fprintf(stdout, "Y is created. %d/n", b);}
};

class A: public X, public Y{
private:
 int m;
public:
 A() : m(0), Y(1), X(2) {}

 int operator++() {
  m++;
  return m;
 }

 int operator++(int) {
  m--;
  return m;
 }
};

class B{
public:
 class _Pnt{
 public:
  int x;
  int y;
 };

 _Pnt m_pnt;
 B() { m_pnt.x = 0; m_pnt.y = 100; }
};

class C : public B {
public:
 C() {}
};

class D : public C {
public:
 D() {}
 int getX() { return m_pnt.x; }
 int getY() { return m_pnt.y; }
};

int _tmain(int argc, _TCHAR* argv[])
{
 A a;

 fprintf(stdout, "%d/n", a++);

 D d;
 fprintf(stdout, "D: x = %d, y = %d/n", d.getX(), d.getY());

 C c;
 fprintf(stdout, "C: x = %d, y = %d/n", c.m_pnt.x, c.m_pnt.y);

 class B::_Pnt pnt;
 pnt.x = 10;
 pnt.y = 20;
 fprintf(stdout, "x = %d, y = %d/n", pnt.x, pnt.y);

 getchar();

 return 0;
}

 

result:

 

X is created. 2

Y is created. 1

-1

D: x = 0, y = 100

C: x = 0, y = 100

x = 10, y = 20