https://coolshell.cn/articles/5265.html
http://www.cnblogs.com/me115/p/4800777.html#h29
https://changkun.gitbooks.io/cpp1x-tutorial/content/1-intro.html
https://coolshell.cn/articles/5265.html
http://www.cnblogs.com/me115/p/4800777.html#h29
https://changkun.gitbooks.io/cpp1x-tutorial/content/1-intro.html