language: C++ 4.7.2 (gcc-4.7.2)
date: 133 days 7 hours ago
link:
visibility: private 
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#include <iostream>
using namespace std;
 
struct A
{
   virtual void f() {std::cout << "A\n";}
};
struct B : public A
{
   virtual void f() {std::cout << "B\n";}
};
 
int main()
{
    A* a = new B;
    
    B* b = dynamic_cast<B*>(a);
    
    b->f();
    
    B& br = dynamic_cast<B&>(*a);
    
    br.f();
    
    try
    {
        A* a2 = new A;
        B& fail = dynamic_cast<B&>(*a2);
    }
    
    catch(std::exception& e)
    {
        cout << e.what() << "\n";
    }
    
    return 0;
}