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  1.  
  2. #include <iostream>
  3. #include <typeinfo>
  4.  
  5. class Bird
  6. {
  7. public:
  8.    virtual ~Bird() {}
  9.    virtual int chirp() { return 0; }
  10. };
  11.  
  12. class SomeOtherBird : public Bird
  13. {
  14. public:
  15.    virtual int chirp() { return 1; }
  16. };
  17.  
  18. void nest( Bird& x )
  19. {
  20.    std::cout << typeid(x).name() << " says " << x.chirp() << '\n';
  21. }
  22.  
  23. int main()
  24. {
  25.    SomeOtherBird s;
  26.    nest( s );
  27.  
  28.    Bird b;
  29.    nest( b );
  30. }
Success #stdin #stdout 0s 2724KB
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stdin
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Standard input is empty
stdout
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13SomeOtherBird says 1
4Bird says 0
https://ideone.com/RRfau
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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