if/switch 문을 사용하지 않고 C 열거형 값을 텍스트로 인쇄하려면 어떻게 해야 합니까?

#include <map>
#include <string_view>

enum Errors { ErrorA = 0, ErrorB, ErrorC };

// Custom insertion function for map
#define INSERT_ELEMENT(p) result.emplace(p, #p);

// Initialize the map
static const auto strings = []() {
    std::map<Errors, std::string_view> result;
    INSERT_ELEMENT(ErrorA);
    INSERT_ELEMENT(ErrorB);
    INSERT_ELEMENT(ErrorC);
    return result;
};

std::ostream& operator<<(std::ostream& out, const Errors value) {
    return out << strings[value];
}

#include <string_view>

enum Errors { ErrorA = 0, ErrorB, ErrorC };

// Structure for mapping enum to text
struct MapEntry {
    Errors value;
    std::string_view str;
};

std::ostream& operator<<(std::ostream& out, const Errors value) {
    const MapEntry entries[] = {
        {ErrorA, "ErrorA"},
        {ErrorB, "ErrorB"},
        {ErrorC, "ErrorC"}
    };

    const char* s = nullptr;
    for (const MapEntry* i = entries; i->str; i++) {
        if (i->value == value) {
            s = i->str;
            break;
        }
    }

    return out << s;
}

#include <string>

enum Errors { ErrorA = 0, ErrorB, ErrorC };

std::ostream& operator<<(std::ostream& out, const Errors value) {
    return out << [value]() {
        switch (value) {
            case ErrorA: return "ErrorA";
            case ErrorB: return "ErrorB";
            case ErrorC: return "ErrorC";
        }
    };
}