然后定义book类，用私有成员变量代表每个字段。
The Book class is then defined, with private member variables for each field.
我如何能在非成员函数使用私有成员变量时，变量是指针？
How can I use a private member variable in a non-member function, when the variable happens to be a pointer?
也就是说，在 C++ 中，同一个类的对象无法看到彼此的私有成员变量。
That is, in C++, objects of the same class cannot see one another's private member variables.
同理，断言也被用来测试函数的内部状态，比如说私有成员变量或者文件的内部变量(variableswith inner -linkage usedstrictlywithinthe file .)。
In the same vein, assert is also used to test the internal state of a function-such as private member variables, or variables with internal linkage used strictly within the file.
同理，断言也被用来测试函数的内部状态，比如说私有成员变量或者文件的内部变量(variableswith inner -linkage usedstrictlywithinthe file .)。
In the same vein, assert is also used to test the internal state of a function-such as private member variables, or variables with internal linkage used strictly within the file.
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