https://blog.csdn.net/mrailence/article/details/52251201
https://blog.csdn.net/qq_14820081/article/details/89231995
https://blog.csdn.net/qq_35651984/article/details/83244780
回调函数c++类中实现
原文：https://www.cnblogs.com/CodeWorkerLiMing/p/11222737.html
