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  1. #include <iostream>
  2. #include <algorithm>
  3.  
  4. template <class T>
  5. struct S
  6. {   
  7.     T I;
  8.     S()
  9.     {   
  10.         static int i;
  11.         int sign = i % 2 ? 1 : -1;
  12.         I = ++i * sign;
  13.     }
  14.  
  15.     bool operator < (const S& rhs) const
  16.     {   
  17.         return I < rhs.I;
  18.     }
  19. };
  20.  
  21. namespace std {
  22.     template <class T>
  23.     inline void swap(S<T>& lhs, S<T>& rhs)
  24.     {   
  25.         std::cout << "called" << std::endl;
  26.         int tmp = lhs.I;
  27.         lhs.I = rhs.I;
  28.         rhs.I = tmp;
  29.     }
  30. }
  31.  
  32. int main()
  33. {   
  34.     S<int> s[10];
  35.     for (unsigned i = 0; i < sizeof(s) / sizeof(s[0]); ++i)
  36.     {   
  37.         std::cout << s[i].I << ' ';
  38.     }
  39.     std::cout << std::endl;
  40.  
  41.     std::sort(s, s + sizeof(s) / sizeof(s[0]));
  42.     for (unsigned i = 0; i < sizeof(s) / sizeof(s[0]); ++i)
  43.     {   
  44.         std::cout << s[i].I << ' ';
  45.     }
  46.     std::cout << std::endl;
  47. }
  48.  
  49.  
Success #stdin #stdout 0.01s 2724KB
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-1 2 -3 4 -5 6 -7 8 -9 10 
-9 -7 -5 -3 -1 2 4 6 8 10
https://ideone.com/OXBRp
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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