如果你没有为拷贝构造函数写正确的代码，就有可能造成list中对象的某些数据成员没有初始化。
If you do not write a correct code for the copy constructor, object within a list will have some data members uninitialized.
理解并掌握构造函数、析构函数、拷贝构造函数、默认构造函数和缺省参数的构造函数的含义、定义方法以及在对象的构造和撤消中的作用。
Understand and master the constructor, destructor, copy constructor, default constructor and default constructor parameters, to define methods and objects of the structure and the role of withdrawal.
理解并掌握构造函数、析构函数、拷贝构造函数、默认构造函数和缺省参数的构造函数的含义、定义方法以及在对象的构造和撤消中的作用。
Understand and master the constructor, destructor, copy constructor, default constructor and default constructor parameters, to define methods and objects of the structure and the role of withdrawal.
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