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  1. #include <iostream>
  2. #include <memory>
  3. #include <functional>
  4.  
  5. struct S
  6. {
  7.     void operator =(int y)
  8.     { x = 5; }
  9.  
  10.     operator int*()
  11.     {
  12.         return &x;
  13.     }
  14.  
  15.     int x;
  16. };
  17.  
  18. std::ostream& operator <<(std::ostream& out, S const& s)
  19. {
  20.     return out << s.x;
  21. }
  22.  
  23. int main()
  24. {
  25.     S s;
  26.     auto x = std::make_shared<S>(std::ref(s));
  27.     *x = 10;
  28.  
  29.     std::cout << *x;
  30. }
Success #stdin #stdout 0s 2984KB
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Standard input is empty
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5
https://ideone.com/XEXSiH
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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