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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_