Determines whether a given type is a pointer to member object type.
判定一个给定的类型是否为成员对象指针类型。
Only arithmetic, enumeration, pointer, pointer to member, and class type arguments are allowed.
只有算术，枚举，指针，指向成员和允许类的类型参数。
Finally, it creates an inquiry context for group member and sets the member name syntax field in the inquiry context structure and returns pointer to created inquiry context structure to the caller.
最后，为组成员创建查询上下文，设置查询上下文结构中的成员名语法字段，把创建的查询上下文结构的指针返回给调用者。
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