The initializer list

    // point.h
    class Point
    {
    private:
        Graph& m_g;
        int    m_x;
        int    m_y;
    public:
        Point( Graph& g, int x, int y );
    };

• New syntax for constructors:

      // point.cpp
      Point::Point( Graph& g, int x, int y )
      :   m_g( g )
      {
          m_x = x;
          m_y = y;
      }

• or,

     // point.cpp
      Point::Point( Graph& g, int x, int y )
      :   m_g( g ),
          m_x( x ),
          m_y( y )
      {
      }