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  1. #include <iostream>
  2.  
  3. enum Traffic_light 
  4. { 
  5. 	green, 
  6. 	yellow, 
  7. 	red
  8. };
  9.  
  10. // prefix increment
  11. Traffic_light& operator++(Traffic_light& t) 
  12. {
  13.     switch (t) 
  14.     {
  15.     case Traffic_light::green:
  16.     	return t = Traffic_light::yellow;
  17. 	case Traffic_light::yellow:
  18. 		return t = Traffic_light::red;
  19. 	case Traffic_light::red:
  20. 		return t = Traffic_light::green;
  21. 	}
  22. }
  23.  
  24. // postfix increment
  25. Traffic_light operator++(Traffic_light& t, int)
  26. {
  27. 	Traffic_light tmp = t;
  28. 	++t;
  29. 	return tmp;
  30. }
  31.  
  32. int main(int argc, const char * argv[])
  33. {
  34.     Traffic_light light = Traffic_light::red;
  35. 	std::cout << "Light is " << light << std::endl;
  36. 	++light;
  37. 	std::cout << "Now Light is " << light << std::endl;
  38. 	light++;
  39. 	std::cout << "And now " << light << std::endl;
  40.     return 0;
  41. }
Success #stdin #stdout 0s 3340KB
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stdin
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Standard input is empty
stdout
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Light is 2
Now Light is 0
And now 1
https://ideone.com/veb85I
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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