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  1. #include <iostream>
  2.  
  3. class A
  4. {
  5. public:
  6.     A(int x) : _value(x) {}
  7.  
  8.     operator int() const { return _value; }
  9.  
  10. private:
  11.     int _value;
  12. };
  13.  
  14. class B : public A
  15. {
  16. public:
  17.  
  18.     B(int y) : A(y) {}
  19. };
  20.  
  21. int main()
  22. {
  23.     A a1(1);
  24.     B b1(10);
  25.     A a2(2);
  26.     B b2(20);
  27.  
  28.     std::cout << a1 << '\n';
  29.     std::cout << b1 << '\n';
  30.     std::cout << a2 << '\n';
  31.     std::cout << b2 << '\n';
  32. }
Success #stdin #stdout 0s 3296KB
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stdin
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Standard input is empty
stdout
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1
10
2
20
https://ideone.com/l0R47N
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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