static void add_int_to_skiplist(apr_skiplist *list, int n){
    int* a = apr_skiplist_alloc(list, sizeof(int));
    *a = n;
    apr_skiplist_insert(list, a);
}

static int comp(void *a, void *b){
    return *((int*) a) - *((int*) b);
}


static int compk(void *a, void *b){
    return comp(a, b);
}


static void skiplist_test(apr_pool_t* p){
    int i = 0;
    apr_skiplist * list = NULL;
    
    apr_skiplist_init(&list, p);
    apr_skiplist_set_compare(list, comp, compk);
    
    /* insert 10 objects */
    for(i = 0; i < 10; ++i){
        add_int_to_skiplist(list, i);
    }

    apr_skiplist_print_struct(list, "_");
    
    /* remove all objects */
    while(apr_skiplist_pop(list, NULL)){
    }

    apr_skiplist_print_struct(list, "_");

    /* insert 10 objects again */
    for(i = 0; i < 10; ++i){
        add_int_to_skiplist(list, i);
        apr_skiplist_print_struct(list, "_");
    }
}