基于C++模板的队列实现，自己实现vector类。在这之前，先用模板实现一个队列。队列的底层是链表。主要是熟悉一下模板的写法。-Template-based C++ queue implementation, to achieve their own vector class. Prior to this, a first queue with templates. The bottom of the queue is a linked list. Mainly to familiarize yourself with the wording of the template.