C++不支持事件模型，这个类可以顺利实现委托，以方便支持事件-C++ does not support the event model, this class can be smoothly commissioned to facilitate the support of the event

本程序通过一个账户类的实现，说明如何使用C++中的模拟事件机制CppEvent-This procedure accounts through a class implementation, explains how to use C++, the analog event mechanism CppEvent