[Boost-users] [ASIO] directory monitor ASIO extension

Hi, I am going through code of directory monitor ASIO extension by Boris Schäling (http://www.highscore.de/boost/dir_monitor.zip) and I am wondering: what is the benefit of making this piece of code / library an ASIO extension. It just feels like it could be easier to use and implement if it wasn't? I hope I am missing something tho and looking here for enlightenment ;) Regards, Szymon Gatner