C++相关资料不多，临时抱佛脚都是泪
http://www.cnblogs.com/kzang/archive/2012/11/29/2792447.html#a2
http://www.cnblogs.com/kzloser/archive/2012/11/29/2794815.html
http://blog.csdn.net/lijia11080117/article/details/44808431
http://blog.csdn.net/exlsunshine/article/details/28660377