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  1.     #include <iostream>
  2.         #define ERROR_VALUES ERROR_VALUE(NO_ERROR, 0, "Everything is fine")\
  3.     ERROR_VALUE(FILE_NOT_FOUND, 1, "File is not found")\
  4.     ERROR_VALUE(LABEL_UNINITIALISED, 2, "A component tried to the label before it was initialised")\
  5.     ERROR_VALUE(UKNOWN_ERROR, -1, "Uh oh")
  6.  
  7.     enum class Error
  8.     {
  9.     #define ERROR_VALUE(NAME,VALUE,DESCR) NAME=VALUE,
  10.         ERROR_VALUES
  11.     #undef ERROR_VALUE
  12.     };
  13.  
  14.     inline std::ostream& operator<<(std::ostream& os, Error err)
  15.     {
  16.     	int errVal = static_cast<int>(err);
  17.         switch (err)
  18.         {
  19.     #ifndef PRODUCTION_BUILD // Don't print out names in production builds
  20.     #define ERROR_VALUE(NAME,VALUE,DESCR) case Error::NAME: return os << "[" #VALUE  "]" #NAME <<"; " << DESCR;
  21.         ERROR_VALUES
  22.     #undef ERROR_VALUE
  23.     #endif
  24.         default:
  25.             return os <<errVal;
  26.         }
  27.     }
  28.  
  29.     int main() {
  30.         std::cout << "Error: " << Error::NO_ERROR << std::endl;
  31.         std::cout << "Error: " << Error::FILE_NOT_FOUND << std::endl;
  32.         std::cout << "Error: " << Error::LABEL_UNINITIALISED << std::endl;
  33.         std::cout << "Error: " << Error::UKNOWN_ERROR << std::endl;
  34.     	return 0;
  35.     }
Success #stdin #stdout 0s 3340KB
comments (?)
stdin 
Standard input is empty
stdout 
Error: [0]NO_ERROR; Everything is fine
Error: [1]FILE_NOT_FOUND; File is not found
Error: [2]LABEL_UNINITIALISED; A component tried to the label before it was initialised
Error: [-1]UKNOWN_ERROR; Uh oh
https://ideone.com/hQTKQp
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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