pub unsafe extern "C" fn rocksdb_create_iterators(
    db: *mut rocksdb_t,
    opts: *mut rocksdb_readoptions_t,
    column_families: *mut *mut rocksdb_column_family_handle_t,
    iterators: *mut *mut rocksdb_iterator_t,
    size: usize,
    errptr: *mut *mut c_char
)