关于重载，覆盖，隐藏

先mark几个帖子

有时间看了 再总结...

http://blog.youkuaiyun.com/jixingzhong/archive/2007/10/31/1858943.aspx

http://www.cppblog.com/ElliottZC/archive/2007/07/20/28414.html

http://topic.youkuaiyun.com/u/20080120/23/cc4d9d62-e975-44d8-a483-75ec61ec7ae1.html

http://blog.chinaunix.net/u1/58858/showart_600804.html