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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. struct A
  5. {
  6.    virtual void f() {std::cout << "A\n";}
  7. };
  8. struct B : public A
  9. {
  10.    virtual void f() {std::cout << "B\n";}
  11. };
  12.  
  13. int main()
  14. {
  15.     A* a = new B;
  16.  
  17.     B* b = dynamic_cast<B*>(a);
  18.  
  19.     b->f();
  20.  
  21.     B& br = dynamic_cast<B&>(*a);
  22.  
  23.     br.f();
  24.  
  25.     try
  26.     {
  27.         A* a2 = new A;
  28.         B& fail = dynamic_cast<B&>(*a2);
  29.     }
  30.  
  31.     catch(std::exception& e)
  32.     {
  33.         cout << e.what() << "\n";
  34.     }
  35.  
  36.     return 0;
  37. }
  38.  
  39.  
Success #stdin #stdout 0.02s 2812KB
comments (?)
stdin
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Standard input is empty
stdout
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B
B
std::bad_cast
https://ideone.com/uugF37
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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