#define BSON_APPEND_DOCUMENT(b, key, val) \

       MongoDB, Inc

       2009-present, MongoDB, Inc.

1.30.4                                            Jun 08, 2025                           BSON_APPEND_DOCUMENT(3)

       The  bson_append_document()  function shall append child to bson using the specified key. The type of the
       field will be a document.

       • bson: A bson_t.

       • key: An ASCII C string containing the name of the field.

       • key_length: The length of key in bytes, or -1 to determine the length with strlen().

       • value: A bson_t containing the sub-document to append.

       Returns true if the operation was applied successfully. The function will fail if appending  value  grows
       bson larger than INT32_MAX.

          #define BSON_APPEND_DOCUMENT(b, key, val) \
             bson_append_document (b, key, (int) strlen (key), val)

          bool
          bson_append_document (bson_t *bson,
                                const char *key,
                                int key_length,
                                const bson_t *value);