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  1. #include <iostream>
  2. #include <typeinfo>
  3.  
  4. struct A
  5. {
  6. 	virtual ~A() {}
  7. };
  8.  
  9. struct B : A
  10. {
  11.  
  12. };
  13.  
  14. struct C : A
  15. {
  16.  
  17. };
  18.  
  19. C *c = new C;
  20.  
  21. B *b = new B;
  22.  
  23. A *a = new A;
  24.  
  25. void foo (A *a)
  26. {
  27.     if(dynamic_cast<B*>(a))
  28.     {
  29.         std::cout << "Type is B*" << std::endl; 
  30.     //cannot dynamic_cast 'a' (of type 'struct A*') to type 'struct B*' (source type is not polymorphic)
  31.     }
  32.  
  33.     if(dynamic_cast<C*>(a))
  34.     {
  35.         std::cout << "Type is C*" << std::endl; 
  36.         //cannot dynamic_cast 'a' (of type 'struct A*') to type 'struct C*' (source type is not polymorphic)
  37.     }
  38. }
  39.  
  40. int main()
  41. {
  42. 	foo(b);
  43. 	foo(c);
  44. 	return 0;
  45. }
Success #stdin #stdout 0s 3272KB
comments (?)
stdin
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Standard input is empty
stdout
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Type is B*
Type is C*
https://ideone.com/AAcZPP
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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