Rust flavored error handling for C

result.h

#ifndef RESULT_H_
#define RESULT_H_

// Includes
#include <stdbool.h>
#include <stdint.h>

// Macros
#define RESULT_TEMPLATE(name, typeOk, typeErr)                                 \
  typedef struct name {                                                        \
    bool isOk;                                                                 \
    union {                                                                    \
      typeOk ok;                                                               \
      typeErr err;                                                             \
    };                                                                         \
  } name

#define RESULT_OK(type, val)                                                   \
  (type) { .isOk = true, .ok = (val) }

#define RESULT_ERR(type, val)                                                  \
  (type) { .isOk = false, .err = (val) }

// Types
RESULT_TEMPLATE(Result, void *, void *);

#endif // RESULT_H_