Demonstrate typeid() function - C++ Class

C++ examples for Class:typeid

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Description

Demonstrate typeid() function

Demo Code

// RTTI must be enabled in compiler
#include <iostream>
#include <typeinfo>           //for typeid()
using namespace std;
class Base/* w w w  .jav  a  2s  .  c  om*/
{
   virtual void virtFunc()    //needed for typeid
   {  }
};
class Derv1 : public Base
{ };
class Derv2 : public Base
{ };
void displayName(Base* pB)
{
   cout << "pointer to an object of: ";  //display name of class
   cout << typeid(*pB).name() << endl;  //pointed to by pB
}
int main()
{
   Base* pBase = new Derv1;
   displayName(pBase);   //"pointer to an object of class Derv1"
   pBase = new Derv2;
   displayName(pBase);   //"pointer to an object of class Derv2"
   return 0;
}

Result


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