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  1. #include <iostream>
  2.  
  3. enum class BoardType : uint8_t { 
  4.   Classic = 0,
  5.   Static = 1,
  6.   Smart = 2,
  7.   Bad = 255  
  8. };
  9.  
  10. BoardType Cast[UINT8_MAX];     // <- сюда просто забить константы -++
  11.                                                                    //
  12. inline BoardType ToEnum(const uint8_t i) {                         //
  13.   BoardType Ret = Cast[i];                                         //
  14.   if (Ret == BoardType::Bad) throw std::range_error("Беда");       //
  15.   return Ret;                                                      //
  16. }                                                                  //
  17.                                                                    //
  18. int main () {                                                      //
  19.   ////// вместо  инициализации ниже - ///////////////////////////////  
  20.   for(auto i=0; i<UINT8_MAX; i++) Cast[i] = BoardType::Bad;
  21.   Cast[0] = BoardType::Classic;
  22.   Cast[1] = BoardType::Static;
  23.   Cast[2] = BoardType::Smart; 
  24.   //////////////////////////////////////////////////////////////////  
  25.   try {  
  26.     std::cout << static_cast<int>(ToEnum(0)) << std::endl;  
  27.     std::cout << static_cast<int>(ToEnum(1)) << std::endl;
  28.     std::cout << static_cast<int>(ToEnum(2)) << std::endl;
  29.     std::cout << static_cast<int>(ToEnum(3)) << std::endl;  
  30.   } catch(std::range_error &e) {
  31.     std::cout << "range_error: " << e.what() << std::endl;  
  32.   } catch(...) {
  33.     std::cout << "что-то совсем пошло не так" << std::endl;  
  34.   }    
  35.   return 0;        
  36. }
  37.  
Success #stdin #stdout 0s 3468KB
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Standard input is empty
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range_error: Беда
https://ideone.com/zssHpQ
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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