An assignment operator was not accessible in a base class and was therefore not generated for a derived class.
基类中的赋值运算符不可访问，因此无法为派生类生成赋值运算符。
When I return by value from an assignment operator, firstly what is the mechanism and basis of calling the copy constructor?
当我返回值赋值操作符，首先是调用复制构造函数为基础的机制？
This section discusses modeling an assignment operator for a C++ class. To generate this assignment operator for a C++ class named Class1, perform these steps
这部分讨论的是为 C++类建模一个赋值操作符。
Unlike strings, lists are mutable. When the bracket operator appears on the left side of an assignment, it identifies the element of the list that will be assigned.
和字符串不同的是，列表是可以修改的。方括号运算符放到一个赋值语句的等号左侧的时候，就会把对应位置的列表元素重新赋值。
Unlike strings, lists are mutable. When the bracket operator appears on the left side of an assignment, it identifies the element of the list that will be assigned.
和字符串不同的是，列表是可以修改的。方括号运算符放到一个赋值语句的等号左侧的时候，就会把对应位置的列表元素重新赋值。
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