using关键字能够取代typedef的全部功能
（1）重定义 unsigned int
![clip_image001[4]](https://images2018.cnblogs.com/blog/1399082/201809/1399082-20180901112217991-609571981.png "clip_image001[4]"){kind=small}
![clip_image002[4]](https://images2018.cnblogs.com/blog/1399082/201809/1399082-20180901112218715-1164010947.png "clip_image002[4]"){kind=small}
（2）重定义模板
![clip_image003[4]](https://images2018.cnblogs.com/blog/1399082/201809/1399082-20180901112219518-1736748361.png "clip_image003[4]")
![clip_image004[4]](https://images2018.cnblogs.com/blog/1399082/201809/1399082-20180901112220353-2016609285.png "clip_image004[4]")
（3）重定义函数指针
![clip_image005[4]](https://images2018.cnblogs.com/blog/1399082/201809/1399082-20180901112221096-1039460884.png "clip_image005[4]"){kind=small}
![clip_image006[4]](https://images2018.cnblogs.com/blog/1399082/201809/1399082-20180901112221758-1253499115.png "clip_image006[4]"){kind=small}
没有用 typedef 或者 using
![clip_image007[4]](https://images2018.cnblogs.com/blog/1399082/201809/1399082-20180901112222487-167219035.png "clip_image007[4]")
用typedef
![clip_image008[4]](https://images2018.cnblogs.com/blog/1399082/201809/1399082-20180901112223300-177302366.png "clip_image008[4]")
用using
![clip_image009[4]](https://images2018.cnblogs.com/blog/1399082/201809/1399082-20180901112224111-982681923.png "clip_image009[4]")
VS不同之处：
![clip_image010[4]](https://images2018.cnblogs.com/blog/1399082/201809/1399082-20180901112224985-1792185826.png "clip_image010[4]")
using和模板别名
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