...表指针的，放在最开始的位置，这种情况下的等价模型大概是这样 ： class A{void * vf_ptr;F0{};F1{};F2{};int a; (其他成员变量)……
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Content Assist挑选出的其他成员变量来自后面定义的另一个类。
The other member variables Content Assist is picking up are from another class, defined later.
用以前定义过的类型建立一个新的枚举(grade)之后，您就可以像使用其他成员变量一样使用它了。
By creating a new enumeration (grade) of the previously defined type, you can then use it like any other member variable.
此外，您常常需要在适当的时候将指向其他类的类成员变量设置为null。
Also, many times member variables of a class that point to other classes simply need to be set to null at the appropriate time.
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