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  1. #include <iostream>
  2.  
  3. struct Top {
  4.     int value;
  5.     Top(int val) : value(val) {}
  6.     int get() {
  7.         return value;
  8.     }
  9. };
  10.  
  11. struct Mid1 : Top {
  12.     Mid1() : Top(3) {}
  13.     int get() {
  14.         return 1;
  15.     }
  16. };
  17.  
  18. struct Mid2 : Top {
  19.     Mid2() : Top(4) {}
  20.     int get() {
  21.         return 2;
  22.     }
  23. };
  24.  
  25. struct Bottom : Mid1, Mid2 {
  26. };
  27.  
  28. int main() {
  29.     Bottom b;
  30.     std::cout << b.Mid1::get() << std::endl;
  31.     std::cout << b.Mid2::get() << std::endl;
  32.     //std::cout << b.Top::get() << std::endl; // ERROR
  33.     //std::cout << b.Mid1::Top::get() << std::endl; // ERROR
  34.     //std::cout << b.Mid2::Top::get() << std::endl; // ERROR
  35.     std::cout << static_cast<Mid1&>(b).Top::get() << std::endl; // OK
  36.     std::cout << static_cast<Mid2&>(b).Top::get() << std::endl; // OK
  37.     return 0;
  38. }
Success #stdin #stdout 0s 4268KB
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https://ideone.com/CldyUc
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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