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  1. struct A {};
  2.  
  3. struct B : A {};
  4.  
  5. int main()
  6. {
  7.     A* a = new B();
  8.  
  9.     B* b = dynamic_cast<B*>(a);
  10. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp: In function ‘int main()’:
prog.cpp:9:30: error: cannot dynamic_cast ‘a’ (of type ‘struct A*’) to type ‘struct B*’ (source type is not polymorphic)
     B* b = dynamic_cast<B*>(a);
                              ^
stdout
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Standard output is empty
https://ideone.com/wxHBB3
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
public

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