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  1.  
  2.     /// Test enum
  3.     enum class Fruit
  4.     {
  5.         apple,
  6.         banana,
  7.         orange,
  8.         pineapple,
  9.         lemon
  10.     };
  11.  
  12.     /// Non-scalable way
  13.     Fruit& operator++(Fruit& f)
  14.     {
  15.         switch(f)
  16.         {
  17.             case Fruit::apple: return f = Fruit::banana;
  18.             case Fruit::banana: return f = Fruit::orange;
  19.             case Fruit::orange: return f = Fruit::pineapple;
  20.             case Fruit::pineapple: return f = Fruit::lemon;
  21.             case Fruit::lemon: return f = Fruit::apple;
  22.         }
  23.     }
  24.  
  25.  
  26.     #include <iostream>
  27.     std::ostream& operator<<(std::ostream& os, Fruit f)
  28.     {
  29.         switch(f)
  30.         {
  31.             case Fruit::apple: os << "Fruit::apple"; return os;
  32.             case Fruit::banana: os << "Fruit::banana"; return os;
  33.             case Fruit::orange: os << "Fruit::orange"; return os;
  34.             case Fruit::pineapple: os << "Fruit::pineapple"; return os;
  35.             case Fruit::lemon: os << "Fruit::lemon"; return os;
  36.         }
  37.     }
  38.     int main()
  39.     {
  40.         Fruit f = Fruit::banana;
  41.         std::cout << "f = " << f << ";\n";
  42.         std::cout << "++f = " << ++f << ";\n";
  43.     }
Success #stdin #stdout 0s 2896KB
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Standard input is empty
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f = Fruit::banana;
++f = Fruit::orange;
https://ideone.com/VBZVum
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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