http://en.cppreference.com/w/cpp/experimental/fs
https://www.starmessagesoftware.com/cpcclibrary
https://github.com/emcrisostomo/fswatch
https://github.com/cginternals/cppfs
https://github.com/SuperV1234/SSVUtils
http://pubs.opengroup.org/onlinepubs/009695399/basedefs/dirent.h.html
原文：http://www.cnblogs.com/lilei9110/p/7560277.html