C++中string类

https://blog.csdn.net/sinat_36184075/article/details/54836053

https://blog.csdn.net/fdqw_sph/article/details/54233971

https://blog.csdn.net/major_zhang/article/details/52117608

https://www.cnblogs.com/X-Do-Better/p/8628492.html

先mark，有时间再回来整理