Convert enum value to std::string in C++ (C++ enum 转 string)

#pragma once

#include <iostream>
#include <vector>

#define DEFINE_ENUM(name, ...)\
class name {\
public:\
    typedef enum { __VA_ARGS__ } enum_type; \
    \
    name(enum_type v): v_(v) {}\
    \
    enum_type Value() const {\
        return v_;\
    }\
    \
    std::string ToString() const {\
        static std::vector<std::string> m = GetMappings();\
        auto i = static_cast<size_t>(v_);\
        if (i > m.size()) {\
            return #name ":-Invalid";\
        }\
        return m[i];\
    }\
    \
    bool operator == (enum_type v) const {\
        return v_ == v;\
    }\
    bool operator != (enum_type v) const {\
        return v_ != v;\
    }\
    \
    static std::string Name() {\
        return #name;\
    }\
    \
    friend std::ostream& operator << (std::ostream& stream, const name& v) {\
        return stream << v.Value();\
    }\
    \
private:\
    static std::vector<std::string> GetMappings() {\
        std::vector<std::string> tokens;\
        std::string s = #__VA_ARGS__; \
        std::string token;\
        for (char c : s) {\
            if (c == ' ' || c == ',') {\
                if (!token.empty()) {\
                    tokens.push_back(Name() + "::" + token);\
                    token.clear();\
                }\
            } else {\
                token += c;\
            }\
        }\
        return tokens;\
    }\
    \
private:\
    enum_type v_;\
}

DEFINE_ENUM(Weekday, 
    Monday, 
    Tuesday, // Monday
    
    Wednesday,
    //
    Thirsday,
);


template<Weekday::enum_type day>
class Test {
public:
    static Weekday GetDay() { return day; };
};

int main() {
    Weekday day = Weekday::Monday;
    std::cout << day.ToString() << std::endl;
    std::cout << (day == Weekday::Thirsday) << std::endl;
    day = Weekday::Tuesday;
    std::cout << day.ToString() << std::endl;
    std::cout << Test<Weekday::Thirsday>::GetDay() << std::endl;
    return 0;
}

 

Output:

Weekday::Monday
0
Weekday::Tuesday
3