git / moonbite-core / src/leveldb/table/two_level_iterator.h · raw

// 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.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_