通过运行时类型识别（RTTI）(Run-Time Type Identification)，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。-Through run-time type identification (RTTI) (Run-Time Type Identification), procedures to use the base class pointer or reference to check the pointer or reference to the object referred to the actual derived type.