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Home » Tip Bank » C++
Language: C++
Expertise: All
May 10, 1999

Applying Typeid to Fundamental Types and Non-Polymorphic Objects

You can use typeid to retrieve the type information of non-polymorphic objects and fundamental types. However, the result in this case refers to the static type of the object rather than its dynamic type. Note however, that applying dynamic_cast to fundamental types or non-polymorphic classes is an error.
 
#include<typeinfo>
#include <iostream>
#include <string>
using namespace std;

typedef int I;
void fundamental()
{
  cout<<typeid(I).name()<<endl; //display 'int'
}
void non_polymorphic()
{
  cout<<typeid(string).name()<<endl; //display the complete type of std::string
}
Danny Kalev
 
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