| BSON_ITER_INIT(3) | Libbson | BSON_ITER_INIT(3) |
bson_iter_init - bson_iter_init()
bool bson_iter_init (bson_iter_t *iter, const bson_t *bson);
The bson_iter_init() function shall initialize iter to iterate upon the BSON document bson. Upon initialization, iter is placed before the first element. Callers must call bson_iter_next(), bson_iter_find(), or bson_iter_find_case() to advance to an element.
Returns true if the iter was successfully initialized.
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");
}
}
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| February 23, 2019 | 1.14.0 |