采用C++编写的组播通信实现类，含发送端与接收端两个类的封装，接收端采用线程回调的方式实现对组播消息的循环接收，使用时，只要继承该类，并重载接收回调函数即可实现对组播消息的接收。-Written in C++ using multicast communication implementation class, including the sending end and the receiving end of two classes of the package, the receiver u