RTTI（Run-Time Type Information)，通过运行时类型信息程序能够使用基类的指针或引用来检查这些指针或引用所指的对象的实际派生类型。(RTTI (Run-Time Type Information), by running the type information program, can use the pointer or reference of the base class to check these pointers or refer to the actual derived types of the objects they refer to.)