c++容器库: http://zh.cppreference.com/w/cpp/container
redis菜鸟教程: http://www.runoob.com/redis/redis-sets.html
c++同行的博客:https://blog.csdn.net/caoshangpa/article/list/1
Linux下面类似 WideCharToMultiByte() 和 MultiByteToWideChar() 函数:https://www.linuxidc.com/Linux/2011-02/32262.htm && http://blog.51cto.com/jazka/231917 && http://jimmee.iteye.com/blog/2174693
unicode / char* 之间相互转换:https://blog.csdn.net/candyliuxj/article/details/6796001
c++11中enum class的用法详解, enum class才是我们想象中的用法, 而之前的enum是对#define xxxx 1 / #define yyyy 2 等的打包