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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. class figure
  6. {
  7. public:
  8.     virtual ~figure(){}
  9. };
  10.  
  11. class Pawn : public figure
  12. {
  13. public:
  14.     virtual ~Pawn(){}
  15. };
  16.  
  17. void value(figure fi)
  18. {
  19.     cout << "val typeid check: " << (dynamic_cast<Pawn*>(&fi) != nullptr) << endl;
  20.     if (dynamic_cast<Pawn*>(&fi) != nullptr)
  21.     {
  22.         Pawn& p = dynamic_cast<Pawn&>(fi);
  23.     }
  24. }
  25.  
  26. void refer(figure& fi)
  27. {
  28.     cout << "val typeid check: " << (dynamic_cast<Pawn*>(&fi) != nullptr) << endl;
  29.     if (dynamic_cast<Pawn*>(&fi) != nullptr)
  30.     {
  31.         Pawn& p = dynamic_cast<Pawn&>(fi);
  32.     }
  33. }
  34.  
  35. int main()
  36. {
  37.     Pawn p;
  38.     value(p);
  39.     refer(p);
  40. }
  41.  
Success #stdin #stdout 0.01s 5360KB
comments (?)
stdin 
Standard input is empty
stdout 
val typeid check: 0
val typeid check: 1
https://ideone.com/n9IW9R
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
secret

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