一个采用链表编写的列表类，类似于CPtrList，不同的是本代码是个模板类，在使用上更加简便。同时，读者可以作为写模板时的参考。-A list prepared by using a list of categories, similar to CPtrList, difference is that this code is a template class, in the use of much simpler. At the same time, readers can be used a