#include <stdlib.h> 

#include <stdio.h>

#include "uthash.h"

typedef struct hs_t {

    int id;

    int tag;

    UT_hash_handle hh;

} hs_t;

static void pr(hs_t **hdpp){

  hs_t *el, *tmp, *hdp = *hdpp;

  HASH_ITER(hh, hdp, el, tmp){

    printf("id %d, tag %d\n",el->id,el->tag);    

  }

}

int main(int argc, char *argv[]) {

  hs_t *hs_head=NULL, *tmp, *replaced=NULL;

  tmp = (hs_t*)malloc(sizeof(hs_t));

  tmp->id = 10;

  tmp->tag = 100;

  HASH_REPLACE_INT(hs_head,id,tmp,replaced);

  if(replaced == NULL)

    printf("added %d %d\n",tmp->id,tmp->tag);

  else

    printf("ERROR, ended up replacing a value, replaced: %p\n",replaced);

  pr(&hs_head);

  tmp = (hs_t*)malloc(sizeof(hs_t));

  tmp->id=11;

  tmp->tag = 101;

  HASH_REPLACE_INT(hs_head,id,tmp,replaced);

  if(replaced == NULL)

    printf("added %d %d\n",tmp->id,tmp->tag);

  else

    printf("ERROR, ended up replacing a value, replaced: %p\n",replaced);

  pr(&hs_head);

  tmp = (hs_t*)malloc(sizeof(hs_t));

  tmp->id=11;

  tmp->tag = 102;

  HASH_REPLACE_INT(hs_head,id,tmp,replaced);

  if(replaced == NULL)

    printf("ERROR, exected to replace a value with key: %d\n",tmp->id);

  else

    printf("replaced %d that had tag %d with tag %d\n",tmp->id,replaced->tag,tmp->tag);

  pr(&hs_head);

  return 0;

}