option.c

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#include <assert.h>
#include <stdlib.h>
#include <string.h>
 
struct complex_data {
    int x;
    double y;
    char* description;
};
 
void complex_data_delete(struct complex_data* self) { free(self->description); }
struct complex_data complex_data_clone(struct complex_data const* self) {
    return (struct complex_data){
        .x = self->x,
        .y = self->y,
        .description = strdup(self->description),
    };
}
 
#define ITEM struct complex_data
#define ITEM_DELETE complex_data_delete
#define ITEM_CLONE complex_data_clone
#define NAME complex_data_option
#include <derive-c/structures/option/template.h>
 
void option_example() {
    complex_data_option opt = complex_data_option_empty();
    assert(!complex_data_option_is_present(&opt));
 
    // when accessing a value, you get a pointer. Not present = NULL
    assert(!complex_data_option_get(&opt));
    assert(!complex_data_option_get_const(&opt));
 
    bool was_present_1 = complex_data_option_replace(
        &opt, (struct complex_data){.x = 42, .y = 3.14, .description = strdup("A complex data")});
    assert(!was_present_1);
 
    assert(complex_data_option_is_present(&opt));
    assert(complex_data_option_get(&opt));
 
    bool was_present_2 = complex_data_option_replace(
        &opt,
        (struct complex_data){.x = 100, .y = 2.71, .description = strdup("Another complex data")});
    assert(was_present_2);
 
    complex_data_option_delete(&opt);
}
 
int main() { option_example(); }