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  1. #include <iostream>
  2. #include <string>
  3. #include <vector>
  4. #include <map>
  5.  
  6.  
  7. // http://stackoverflow.com/questions/236129/how-to-split-a-string-in-c
  8. std::vector<std::string> split(const std::string &text, char sep) {
  9.     std::vector<std::string> tokens;
  10.     size_t start = 0, end = 0;
  11.     while ((end = text.find(sep, start)) != std::string::npos) {
  12.         tokens.push_back(text.substr(start, end - start));
  13.         start = end + 1;
  14.     }
  15.     tokens.push_back(text.substr(start));
  16.     return tokens;
  17. }
  18.  
  19. std::vector<std::string> parse(const char* args)
  20. {
  21.     return split(args, ',');
  22. }
  23.  
  24. std::vector<std::string> parse(const char* args);
  25.  
  26. template<typename T, typename ...Ts>
  27. std::map<T, std::string> make_map(const char* text, Ts... args)
  28. {
  29.     std::vector<T> keys{args...};
  30.     std::vector<std::string> vals = parse(text);
  31.     auto k = keys.cbegin();
  32.     auto v = vals.cbegin();
  33.     std::map<T, std::string> r;
  34.     for (; k != keys.cend(); k++, v++) {
  35.         r.emplace(*k, *v);
  36.     }
  37.     return r;
  38.  
  39. }
  40.  
  41. #define ENUM(name, ...)                                                              \
  42. enum name                                                                            \
  43. {                                                                                    \
  44.     __VA_ARGS__                                                                      \
  45. };                                                                                   \
  46. static std::string to_string(const name v) {                                         \
  47.     static std::map<name, std::string> m {make_map<name>(#__VA_ARGS__, __VA_ARGS__)};\
  48.     return m.at(v);                                                                  \
  49. }
  50.  
  51.  
  52. ENUM(Color, Red,Green,Blue)
  53. namespace ns {
  54. ENUM(Alignment, Left,Right)
  55. }
  56.  
  57. class X
  58. {
  59. public:
  60.     ENUM(Y,A,B,C)
  61. };
  62.  
  63.  
  64. int main(int , char**)
  65. {
  66.     std::cout << to_string(Red) << to_string(Blue);
  67.     std::cout << to_string(ns::Left) << to_string(ns::Right);
  68.     std::cout << X::to_string(X::A) << X::to_string(X::B);
  69.     return 0;
  70. }
  71.  
Success #stdin #stdout 0s 3464KB
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Standard input is empty
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RedBlueLeftRightAB
https://ideone.com/IVaO3b
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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