pointer type

基本解释

Returns a pointer to the run-time type information (RTTI) table for the object type.
返回一个指向用于说明对象类型的RTTI表的指针。
If that pointer is a base-class type pointer that points to a derived-type object, then that object is sliced down ( Section 15.3.1, p. 577); only the base-class part is thrown.
如果该指针是一个指向派生类对象的基类类型指针，则那个对象将被分割（第15.3.1 节），只抛出基类部分。
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I find it easiest to mimic the pattern of structure declaration used in the official DDK, so I declared this device extension as a structure with a tag as well as a type and pointer-to-type name.
很容易模仿在正式的DDK种使用的结构声明的模式，所以我把这个设备扩展名声明称一个结构，伴随标签和类型以及类型指针名称。
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