"0或1长度数组 :
(转)C语言中长度为0的数组
https://www.cnblogs.com/albert1017/p/3898073.html
结构体中最后一个成员为[0]或[1]长度数组(柔性数组成员)的用法
https://blog.youkuaiyun.com/xiaofei0859/article/details/74963441
长度为0的数组
https://blog.youkuaiyun.com/qq_35269813/article/details/80931169