#include <bson/bson.h>
#define BSON_ITER_HOLDS_DOUBLE(iter) /* ... */
#define BSON_ITER_HOLDS_UTF8(iter) /* ... */
#define BSON_ITER_HOLDS_DOCUMENT(iter) /* ... */
#define BSON_ITER_HOLDS_ARRAY(iter) /* ... */
#define BSON_ITER_HOLDS_BINARY(iter) /* ... */
#define BSON_ITER_HOLDS_UNDEFINED(iter) /* ... */
#define BSON_ITER_HOLDS_OID(iter) /* ... */
#define BSON_ITER_HOLDS_BOOL(iter) /* ... */
#define BSON_ITER_HOLDS_DATE_TIME(iter) /* ... */
#define BSON_ITER_HOLDS_NULL(iter) /* ... */
#define BSON_ITER_HOLDS_REGEX(iter) /* ... */
#define BSON_ITER_HOLDS_DBPOINTER(iter) /* ... */
#define BSON_ITER_HOLDS_CODE(iter) /* ... */
#define BSON_ITER_HOLDS_SYMBOL(iter) /* ... */
#define BSON_ITER_HOLDS_CODEWSCOPE(iter) /* ... */
#define BSON_ITER_HOLDS_INT32(iter) /* ... */
#define BSON_ITER_HOLDS_TIMESTAMP(iter) /* ... */
#define BSON_ITER_HOLDS_INT64(iter) /* ... */
#define BSON_ITER_HOLDS_DECIMAL128(iter) /* ... */
#define BSON_ITER_HOLDS_MAXKEY(iter) /* ... */
#define BSON_ITER_HOLDS_MINKEY(iter) /* ... */
#define BSON_ITER_HOLDS_INT(iter) \


   (BSON_ITER_HOLDS_INT32 (iter) || BSON_ITER_HOLDS_INT64 (iter))
#define BSON_ITER_HOLDS_NUMBER(iter) \


   (BSON_ITER_HOLDS_INT (iter) || BSON_ITER_HOLDS_DOUBLE (iter))
#define BSON_ITER_IS_KEY(iter, key) \


   (0 == strcmp ((key), bson_iter_key ((iter))))
typedef struct {


   /*< private >*/
} bson_iter_t;

bson_iter_t iter;
if (bson_iter_init (&iter, my_bson_doc)) {


   while (bson_iter_next (&iter)) {


      printf ("Found a field named: %s\n", bson_iter_key (&iter));


   }
}

bson_iter_t iter;
if (bson_iter_init (&iter, my_bson_doc) && bson_iter_find (&iter, "my_field")) {


   printf ("Found the field named: %s\n", bson_iter_key (&iter));
}

bson_iter_t iter;
bson_iter_t sub_iter;
if (bson_iter_init_find (&iter, my_bson_doc, "mysubdoc") &&


    (BSON_ITER_HOLDS_DOCUMENT (&iter) || BSON_ITER_HOLDS_ARRAY (&iter)) &&


    bson_iter_recurse (&iter, &sub_iter)) {


   while (bson_iter_next (&sub_iter)) {


      printf ("Found key \"%s\" in sub document.\n", bson_iter_key (&sub_iter));


   }
}

bson_iter_t iter;
if (bson_iter_init (&iter, my_doc) &&


    bson_iter_find_descendant (&iter, "a.b.c.d", &sub_iter)) {


   printf ("The type of a.b.c.d is: %d\n", (int) bson_iter_type (&sub_iter));
}