MacroBasedEnum.h

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#ifdef DEFINE_ENUM
#define ENUM_TYPE DEFINE_ENUM
#endif
 
#if !defined(ENUM_LIST) || !defined(ENUM_TYPE)
#error "In order to use MacroBasedEnum.h ENUM_LIST and DEFINE_ENUM must be defined"
#endif
 
#ifdef DEFINE_ENUM
#define CONCAT_SYMBOLS(LEFT, RIGHT) LEFT##RIGHT
#define QUOTE(NAME) #NAME
#define STR(MACRO) QUOTE(MACRO)
 
    namespace {
        const char* CONCAT_SYMBOLS(ENUM_TYPE, ToString)(ENUM_TYPE value) {
            switch (value) {
#ifdef EXPLICIT_VALUE_ENUM
#define ENUM_VALUE(LABEL, VALUE) case ENUM_TYPE::LABEL: return #LABEL;
#else
#define ENUM_VALUE(LABEL) case ENUM_TYPE::LABEL: return #LABEL;
#endif
 
            ENUM_LIST
 
#undef ENUM_VALUE
            }
 
            return nullptr;
        }
    }
 
    std::ostream& operator<<(std::ostream& out, ENUM_TYPE value) {
        auto pLabel = CONCAT_SYMBOLS(ENUM_TYPE, ToString)(value);
        if (pLabel)
            out << pLabel;
        else
            out << STR(ENUM_TYPE) << "(0x" << utils::HexFormat(utils::to_underlying_type(value)) << ")";
        return out;
    }
 
#undef STR
#undef QUOTE
#undef CONCAT_SYMBOLS
#endif
 
#undef ENUM_TYPE