You must define the member in the class header.
你必须在类的头文件中定义这个成员。
Class header file, scrolled to the start of the class declaration.
类的头文件，滚动到类声明的开头。
For example, suppose the programmer is familiar only with the header of class d.
例如，假设程序员只熟悉类d的头。
Here is the class, in a header file called "Sample.h".
以下就是这个类，位于名为“Example . h”的头文件中。
The first is the header (.h) file that declares the interface of the class.
第一个是头文件（.h），用于声明类接口；
Sets the name of the header file for the new object's class.
为新对象的类设置头文件的名称。
The header indicates that the new class is called Point.
头部代码的意思是表示新建的类名字叫Point。
The header indicates that the new class is called Point.
头部代码的意思是表示新建的类名字叫Point。
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