We need a uniform way to deal with generic pointers; therefore, we prefix their names with an underscore and only use them to initialize local variables with the desired types and with the appropriate names.

• 我们需要一个统一的方式来处理这些通用指针，故我们用名字前面加下划线的方法来表示这些通用指针，并且只用他们来初始化需要的特定类型和名称的局部变量。