#include "uthash.h"
#include <stdlib.h>   /* malloc */
#include <stdio.h>    /* printf */

typedef struct example_user_t {
    int id;
    int cookie;
    UT_hash_handle hh;
} example_user_t;

int main(int argc,char *argv[]) {
    int i;
    example_user_t *user, *tmp, *users=NULL;

    /* create elements */
    for(i=0;i<10;i++) {
        if ( (user = (example_user_t*)malloc(sizeof(example_user_t))) == NULL) exit(-1);
        user->id = i;
        user->cookie = i*i;
        HASH_ADD_INT(users,id,user);
    }

    /* delete each even ID */
    for(i=0;i<10;i+=2) {
        HASH_FIND_INT(users,&i,tmp);
        if (tmp) {
            HASH_DEL(users,tmp);
            free(tmp);
        } else printf("user id %d not found\n", i);
    }

    i=9;
    HASH_FIND_INT(users,&i,tmp);
    if (tmp) {
        while(tmp) {
            printf("id %d, following prev...\n", tmp->id);
            tmp = (example_user_t*)tmp->hh.prev;
        }
    } else printf("user id %d not found\n", i);

   return 0;
}