设计原则：创建对象时，是否需要默认的东西
1.默认构造函数
（1）成员变量初始化
2.带参构造函数
3.拷贝构造函数
设计原则：是否有动态内存需要释放
（1）默认析构函数
（2）虚析构函数
设计原则：看创建对象是否有相应的操作符要求
设计原则：当需要修改某个变量的值时，但不想要将整个变量所占的空间传进去时
设计原则：看是否需要修改变量的值
（1）引用参数值是否能被修改
（2）成员函数返回值是否能被修改
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