pub unsafe extern "C" fn rocksdb_writebatch_singledelete_cf_with_ts(
    b: *mut rocksdb_writebatch_t,
    column_family: *mut rocksdb_column_family_handle_t,
    key: *const c_char,
    klen: usize,
    ts: *const c_char,
    tslen: usize
)