To manage a class with pointer members, we must define all three copy-control members: the copy constructor, assignment operator, and the destructor.
为了管理具有指针成员的类，必须定义三个复制控制成员：复制构造函数、赋值操作符和析构函数。
Also, the dereference operator, which allows reading and writing to a pointer.
另外还用作取消引用运算符，允许读取和写入指针。
Also, the dereference operator, which allows reading and writing to a pointer.
另外还用作取消引用运算符，允许读取和写入指针。
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