NAME

       bson_iter_t - bson_iter_t

       BSON Document Iterator

SYNOPSIS

          #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;

DESCRIPTION

       bson_iter_t  is  a structure used to iterate through the elements of a bson_t. It is meant
       to be used on the stack and can be discarded at  any  time  as  it  contains  no  external
       allocation.  The  contents  of  the  structure should be considered private and may change
       between releases, however the structure size will not change.

       The bson_t MUST be valid for the lifetime of the iter and it is an  error  to  modify  the
       bson_t while using the iter.

EXAMPLES

          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));
          }

AUTHOR

       MongoDB, Inc

COPYRIGHT

       2017-present, MongoDB, Inc