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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#ifndef STORAGE_LEVELDB_TABLE_TWO_LEVEL_ITERATOR_H_
#define STORAGE_LEVELDB_TABLE_TWO_LEVEL_ITERATOR_H_
#include "leveldb/iterator.h"
namespace leveldb {
struct ReadOptions;
// Return a new two level iterator. A two-level iterator contains an
// index iterator whose values point to a sequence of blocks where
// each block is itself a sequence of key,value pairs. The returned
// two-level iterator yields the concatenation of all key/value pairs
// in the sequence of blocks. Takes ownership of "index_iter" and
// will delete it when no longer needed.
//
// Uses a supplied function to convert an index_iter value into
// an iterator over the contents of the corresponding block.
extern Iterator* NewTwoLevelIterator(
Iterator* index_iter,
Iterator* (*block_function)(
void* arg,
const ReadOptions& options,
const Slice& index_value),
void* arg,
const ReadOptions& options);
} // namespace leveldb
#endif // STORAGE_LEVELDB_TABLE_TWO_LEVEL_ITERATOR_H_
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