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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. class Test
  5. {
  6. public:
  7.     enum class Fruit
  8.     {
  9.       apple,
  10.       banana,
  11.       orange,
  12.       pineapple,
  13.       lemon
  14.     };
  15.  
  16.     friend Fruit operator++(Fruit& f)
  17.     {
  18.       switch (f)
  19.       {
  20.       case Fruit::apple: return f = Fruit::banana;
  21.       case Fruit::banana: return f = Fruit::orange;
  22.       case Fruit::orange: return f = Fruit::pineapple;
  23.       case Fruit::pineapple: return f = Fruit::lemon;
  24.       case Fruit::lemon: return f = Fruit::apple;
  25.       }
  26.     }
  27.  
  28.     friend std::ostream& operator<<( std::ostream& os, const Fruit &fruit )
  29.     {
  30.       switch( fruit )
  31.       {
  32.       case Fruit::apple: os << "apple"; break;
  33.       case Fruit::banana: os << "banana"; break;
  34.       case Fruit::orange: os << "orange"; break;
  35.       }
  36.       return os;
  37.     }
  38. };
  39.  
  40. int main() {
  41. 	// your code goes here
  42. 	Test::Fruit f = Test::Fruit::banana;
  43.  
  44. 	cout << ++f << endl;
  45.  
  46. 	return 0;
  47. }
  48.  
Success #stdin #stdout 0s 4404KB
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stdin
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Standard input is empty
stdout
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orange
https://ideone.com/mOVFdW
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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