optional.h

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#pragma once
 
#include <assert.h>
#include <stdbool.h>
#include <stddef.h>
 
typedef struct {
  bool has_value; 
  double value;   
} optional_double_t;
 
static inline void optional_double_set(optional_double_t *me, double value) {
  assert(me != NULL);
  me->has_value = true;
  me->value = value;
}
 
static inline double optional_double_value_or(optional_double_t me,
                                              double fallback) {
  if (me.has_value) {
    return me.value;
  }
  return fallback;
}