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  1. #include <iostream>
  2. #include <typeinfo>
  3.  
  4. struct A
  5. {
  6.     virtual ~A() {}
  7.     virtual int get_it() const { return i ; }
  8.     int i = 3 ;
  9. };
  10.  
  11. struct B : A
  12. {
  13.     virtual int get_it() const override { return A::get_it() + j ; }
  14.     int j = 5 ;
  15. };
  16.  
  17. int foo( const A& a ) { return a.get_it() ; }
  18.  
  19. int bar( const A& a )
  20. {
  21.     int result = a.i ;
  22.  
  23.     try
  24.     {
  25.         const B& b = dynamic_cast< const B& >(a) ;
  26.         result += b.j ;
  27.     }
  28.     catch( const std::bad_cast& ) { /* this is not a B */ }
  29.  
  30.     return result ;
  31. }
  32.  
  33. int main()
  34. {
  35.     A a ;
  36.     std::cout << foo(a) << ' ' << bar(a) << '\n' ;
  37.  
  38.     B b ;
  39.     std::cout << foo(b) << ' ' << bar(b) << '\n' ;
  40.  
  41. }
  42.  
Success #stdin #stdout 0s 2984KB
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stdin
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Standard input is empty
stdout
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3 3
8 8
https://ideone.com/mMvt8Q
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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