#include <stdlib.h>
#include <stdio.h>
#include <gc/gc.h>

struct node {
    int i;
};

struct node *new_node(int i)
{
    struct node *node = GC_malloc(sizeof(struct node));
    node->i = i;
    return node;
}

void print_nodes(struct node **nodes, int n)
{
    fprintf(stderr, "[");
    if (n > 0) {
        fprintf(stderr, "%d", nodes[0]->i);
        for (int i = 1; i < n; i++) {
            fprintf(stderr, ", %d", nodes[i]->i);
        }
    }
    fprintf(stderr, "]\n");
}

int main(void)
{
    GC_init();

    struct node **nodes = GC_malloc(3 * sizeof(struct node *));
    nodes[0] = new_node(1);
    nodes[1] = new_node(2);
    nodes[2] = new_node(3);
    print_nodes(nodes, 3);

    struct node **a = nodes + 0;
    struct node **b = nodes + 1;
    struct node **c = nodes + 2;
    printf("a: %d\n", (*a)->i);
    printf("b: %d\n", (*b)->i);
    printf("c: %d\n", (*c)->i);

    nodes[0] = new_node(4);
    nodes[1] = new_node(5);
    nodes[2] = new_node(6);
    print_nodes(nodes, 3);

    printf("a: %d\n", (*a)->i);
    printf("b: %d\n", (*b)->i);
    printf("c: %d\n", (*c)->i);

    return EXIT_SUCCESS;
}