厌烦的快

对于包含多个成员变量的类，打印每个变量在屏幕上会让人厌烦的快。例如，考虑下面的类：

1234567891011121314151617class Point{private:    double m_dX, m_dY, m_dZ; public:    Point(double dX=0.0, double dY=0.0, double dZ=0.0)    {    m_dX = dX;    m_dY = dY;    m_dZ = dZ;    }     double GetX() { return m_dX; }    double GetY() { return m_dY; }    double GetZ() { return m_dZ; }};

如果你想打印该类的实例在屏幕上，你会这样做：

1234Point cPoint(5.0, 6.0, 7.0);cout << "(" << cPoint.GetX() << ", " <<    cPoint.GetY() << ", " <<    cPoint.GetZ() << ")";

这仅仅是一个实例！如果你能简单地键入要容易的多：

12Point cPoint(5.0, 6.0, 7.0);cout << cPoint;