//[DllImport("libleveldb", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.Cdecl)]
//static extern void leveldb_approximate_sizes(IntPtr /* DB */ db, int num_ranges, byte[] range_start_key, long range_start_key_len, byte[] range_limit_key, long range_limit_key_len, out long sizes);
public static IntPtr leveldb_create_iterator(IntPtr /* DB */ db, IntPtr /* ReadOption */ options)
{
return(NativeRocksDB.rocksdb_create_iterator(db, options));
}