wyh hw02 #72
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wyh hw02 #72
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1.将prev改成shared_ptr类型,防止首尾指针互相指向，无法释放
2.给Node的构造函数添加explicit防止隐式构造，并且使用初始化列表减少一次赋值。
3.用两个指针实现深拷贝
4.为什么删除拷贝赋值函数也不出错？ 因为编译器默认使用析构函数+拷贝构造来代替拷贝赋值函数
5.print函数处：有什么值得改进的？传参const List&,减少拷贝并提高运行速度，减少运行时内存占用