http://www.cppblog.com/tanky-woo/archive/2011/01/19/138855.html
http://www.cppblog.com/tanky-woo/archive/2011/01/17/138688.html
http://www.wutianqi.com/?p=1890
http://www.wutianqi.com/?p=1892
http://www.wutianqi.com/?p=1894
原文：http://www.cnblogs.com/lpxblog/p/5068946.html