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  1. #include <iostream>
  2. #include <typeinfo>
  3.  
  4. using std::cout;
  5. using std::endl;
  6.  
  7. struct C;
  8.  
  9. struct B
  10. {
  11.     long unsigned int hash;
  12.  
  13.     B(C *c);
  14.  
  15.     virtual ~B() = default;
  16. };
  17.  
  18. struct C : B
  19. {
  20.     C() : B(this)
  21.     {
  22.         cout << "C()" << endl;
  23.     }
  24. };
  25.  
  26. B::B(C *c)
  27. {
  28.     hash = typeid(*c).hash_code(); //1, UB?
  29. }
  30.  
  31. C c;
  32. int main()
  33. {
  34.     cout << c.hash << endl;
  35.     cout << typeid(c).hash_code() << endl;
  36. }
Success #stdin #stdout 0s 3296KB
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Standard input is empty
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C()
1621135011
3641736028
https://ideone.com/7IiYP0
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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