C++ - 判斷同類別

例如:

有基本物件
class MyShape;

和三個繼承物件
class MyLine : MyShape;
class MyRect : MyShape;
class MyEllipse : MyShape;

MyShape *aShape = (MyShape*)new MyLine;
MyShape *aShape = (MyShape*)new MyRect;
MyShape *aShape = (MyShape*)new MyEllipse;


要判斷 aShape 是哪種類別, 可用:

typeid(*aShape) == typeid(MyLine)

使用時要

#include 

是 class type_info

也可以用 cout << typeid(*aShape).name() << endl;  

直接印出類別名稱.