C语言中比较优雅的错误定义
废话不多说，直接上代码
#include <stdio.h>
#include <stdlib.h>
#define foreach_http_error \
_ (401, "401 error") \
_ (501, "501 error")
typedef enum
{
#define _(sym,string) HTTP_ERROR_##sym,
foreach_http_error
#undef _
HTTP_N_ERROR,
} http_reply_error_t;
static char *http_error_strings[] = {
#define _(sym,string) string,
foreach_http_error
#undef _
};
const char *get_error(const int code) {
return http_error_strings[code];
}
int main() {
const char *err = get_error(HTTP_ERROR_401);
printf("err string: %s\n", err);
getchar();
return 0;
}