static void
print_doc_id (const bson_t *doc)
{
bson_iter_t iter;
bson_oid_t oid;
char oidstr[25];
if (bson_iter_init (&iter, doc) && bson_iter_find (&iter, "_id") &&
BSON_ITER_HOLDS_OID (&iter)) {
bson_iter_oid (&iter, &oid);
bson_oid_to_string (&oid, oidstr);
printf ("%s\n", oidstr);
} else {
printf ("Document is missing _id.\n");
}
}
/* alternatively */
static void
print_doc_id (const bson_t *doc)
{
bson_iter_t iter;
bson_oid_t oid;
char oidstr[25];
if (bson_iter_init_find (&iter, doc, "_id") && BSON_ITER_HOLDS_OID (&iter)) {
bson_iter_oid (&iter, &oid);
bson_oid_to_string (&oid, oidstr);
printf ("%s\n", oidstr);
} else {
printf ("Document is missing _id.\n");
}
}