hw02 done #69
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hw02 done #69
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1.修改next，prev指针
类似于课上所讲的情况，两个共享指针互相指向，会造成循环引用，引用计数无法置零，无法被回收。前一个指针“拥有”后一个指针，next为unique，prev为普通指针。
2.构造函数优化
可以使用引用，如果为模板类，可以优化速度，模板类尝试修改了一部分，学艺不精，以后再尝试。
3.修改了insert的逻辑
4.erase因为指针类型的修改，需要修改顺序
5.析构函数
每有一个Node就应该调用一次，原始案例中少了因为有循环引用问题，没有回收空间。
6.为什么删除拷贝赋值函数也不出错？
因为代码中没有调用
7.做了些简单的越界处理
8.print函数修改
增加引用