对象池接口——有对象意识的接口，在对象创建和删除过程中分别相应地调用构造函数和析构函数。
Object pool interface — an object-aware interface that calls the constructor and destructors appropriately during object creation and deletion, respectively.
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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