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