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#include "uthash.h"
#include <stdlib.h> /* malloc */
#include <stdio.h> /* printf */
typedef struct {
int id;
UT_hash_handle hh;
UT_hash_handle ah;
} example_user_t;
#define EVENS(x) ((((example_user_t*)(x))->id % 2) == 0)
static int idcmp(void *_a, void *_b)
{
example_user_t *a = (example_user_t*)_a;
example_user_t *b = (example_user_t*)_b;
return (a->id - b->id);
}
int main()
{
int i;
example_user_t *user, *users=NULL, *ausers=NULL;
/* create elements */
for(i=0; i<10; i++) {
user = (example_user_t*)malloc(sizeof(example_user_t));
if (user == NULL) {
exit(-1);
}
user->id = i;
HASH_ADD_INT(users,id,user);
}
for(user=users; user!=NULL; user=(example_user_t*)(user->hh.next)) {
printf("user %d\n", user->id);
}
printf("users count: %u\n", HASH_CNT(hh,users));
/* now select some users into ausers */
HASH_SELECT(ah,ausers,hh,users,EVENS);
HASH_SRT(ah,ausers,idcmp);
for(user=ausers; user!=NULL; user=(example_user_t*)(user->ah.next)) {
printf("auser %d\n", user->id);
}
printf("ausers count: %u\n", HASH_CNT(ah,ausers));
HASH_CLEAR(ah,ausers);
printf("cleared ausers.\n");
printf("ausers count: %u\n", HASH_CNT(ah,ausers));
for(user=ausers; user!=NULL; user=(example_user_t*)(user->ah.next)) {
printf("auser %d\n", user->id);
}
printf("users count: %u\n", HASH_CNT(hh,users));
return 0;
}
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