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/**
* optional.h - some macros for optional types
*
* 2023 Yaroslav de la Peña Smirnov
*
*/
#ifndef OPTIONAL_H
#define OPTIONAL_H
#include <stdbool.h>
#define OPTIONAL(T, name) struct { bool has; T data; } name
#define OPTNONE { .has = false }
#define OPTSOME(d) { .has = true, .data = d }
#define optional_set_none(opt) opt.has = false
#define optional_set_some(opt, d) \
(opt.has = true, opt.data = d)
#define optional_has(opt) (opt.has)
#define optional_hasnt(opt) (!opt.has)
#define optional_unwrap(src, dst) \
(optional_has(src) ? (dst = src.data, true) : (false))
#endif
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