问C++：异常返回的不完全错误消息

EN

".... Point type: " + std::to_string(sortedTypedPoints[0].type)

throw std::runtime_error("First point in the vector should be a start vertex. "
    "Point type: " + std::to_string(sortedTypedPoints[0].type));

std::string to_str(PointType type)
{
    switch (type)
    {
    case PointType::START_VERTEX:
        return "START_VERTEX";
    case ...:
        return "...";
    }
    return "unknown";
}

throw std::runtime_error("First point in the vector should be a start vertex. "
    "Point type: " + to_str(sortedTypedPoints[0].type));

    std::string to_str(PointType type)
    {
#define T(t) if (type==PointType::t) return #t
        T(START_VERTEX);
        T(END_VERTEX);
        T(...);
        return "unknown";
#undef T
    }

char const * psz_error_message{"First point in the vector should be a start vertex. Point type: "};
throw std::runtime_error(psz_error_message + static_cast< int >(sortedTypedPoints[0].type));