typedef enum {

       MongoDB, Inc

       2009-present, MongoDB, Inc.

1.30.4                                            Jun 08, 2025                             MONGOC_READ_MODE_T(3)

       This enum describes how reads should be dispatched. The default is MONGOC_READ_PRIMARY.

       Please see the MongoDB website for a description of ReadPreferences.

          typedef enum {
             MONGOC_READ_PRIMARY = (1 << 0),
             MONGOC_READ_SECONDARY = (1 << 1),
             MONGOC_READ_PRIMARY_PREFERRED = (1 << 2) | MONGOC_READ_PRIMARY,
             MONGOC_READ_SECONDARY_PREFERRED = (1 << 2) | MONGOC_READ_SECONDARY,
             MONGOC_READ_NEAREST = (1 << 3) | MONGOC_READ_SECONDARY,
          } mongoc_read_mode_t;