#include <iostream.h>

class Board;

class Board
{  public:
      typedef void (Board::* B_MOVE)(unsigned);
      Board(unsigned x0, unsigned y0)
      : x(x0), y(y0){}
      void up   (unsigned n = 1) { y += n; }
      void down (unsigned n = 1) { y -= n; }
      void left (unsigned n = 1) { x -= n; }
      void right(unsigned n = 1) { x += n; }
      void move(int m, B_MOVE h, int n, B_MOVE v);
    /* other members */
      void display() { cout << x << "  " << y << endl; }
    static const B_MOVE u; 
    static const B_MOVE d;
    static const B_MOVE l;
    static const B_MOVE r;
   private:
      unsigned int x;  // current x position
      unsigned int y;  // current y position
    /* other members */
};     


void Board::move(int m, B_MOVE h, int n, B_MOVE v)
{   (this->*h)(m);
    (this->*v)(n);
}

const Board::B_MOVE Board::u = &Board::up;
const Board::B_MOVE Board::d = &Board::down;
const Board::B_MOVE Board::l = &Board::left;
const Board::B_MOVE Board::r = &Board::right;

int main()
{    
     Board ab(7,10);
     ab.display();
     ab.move(2, Board::u, 3, Board::r);   // moves up 2 and right 3
     ab.display();
}