gistfile1.txt

#define HTTP_STATUS_CODES(_) \
  _(200, OK) \
  _(404, NOT_FOUND) \
  _(505, INTERNAL_ERROR)

enum StatusCodes {
#define GENERATE_ENUM(CODE, MSG) MSG = CODE,

HTTP_STATUS_CODES(GENERATE_ENUM)
}

const char* STATUS_CODE_STRING[] = {
#define GENERATE_STRING(CODE, MSG) #MSG,

HTTP_STATUS_CODES(GENERATE_STRING)
};

const* StatusCodeToString() ...
and so on..