...blic: virtual double calcArea()=0; virtual double calcPerimeter()=0;}; 运行时类型识别(RTTI Run-Time Type Identification)。
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If the sources don't use dynamic_cast or the typeid operator, Run Time type Identification (RTTI) might be disabled.
如果源代码没有使用dynamic_cast或者typeid操作符，那么就可以禁用运行时类型识别(RTTI)。
Run-time Type Identification (RTTI) allows programs that use pointers or references to base classes to retrieve the actual derived types of the objects to which these pointers or references refer.
通过运行时类型识别（RTTI），程序能够使用基类的指针或引用来检索这些指针或引用所指对象的实际派生类型。
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