Convert enum value to std::string in C++ (C++ enum 转 string)
1 #include <iostream> 2 #include <vector> 3 4 #define DEFINE_ENUM(name, ...)\ 5 class name {\ 6 public:\ 7 name(size_t v): v_(v) {}\ 8 \ 9 enum { __VA_ARGS__ }; \ 10 \ 11 std::string ToString() {\ 12 static std::vector<std::string> m = GetMappings();\ 13 if (v_ > m.size()) {\ 14 return #name ":-Invalid";\ 15 }\ 16 return m[v_];\ 17 }\ 18 private:\ 19 std::vector<std::string> GetMappings() {\ 20 const static std::string kEnumName = #name;\ 21 std::vector<std::string> tokens;\ 22 std::string s = #__VA_ARGS__; \ 23 std::string token;\ 24 for (char c : s) {\ 25 if (c == ' ' || c == ',') {\ 26 if (!token.empty()) {\ 27 tokens.push_back(kEnumName + "::" + token);\ 28 token.clear();\ 29 }\ 30 } else {\ 31 token += c;\ 32 }\ 33 }\ 34 return tokens;\ 35 }\ 36 \ 37 private:\ 38 size_t v_;\ 39 } 40 41 DEFINE_ENUM(Weekday, 42 Monday, 43 Tuesday, 44 ); 45 46 int main() { 47 Weekday day = Weekday::Tuesday; 48 std::cout << day.ToString() << std::endl; 49 return 0; 50 }
打印结果：
Weekday::Tuesday