pub unsafe extern "C" fn rocksdb_approximate_sizes( db: *mut rocksdb_t, num_ranges: c_int, range_start_key: *const *const c_char, range_start_key_len: *const usize, range_limit_key: *const *const c_char, range_limit_key_len: *const usize, sizes: *mut u64, errptr: *mut *mut c_char)
