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diff --git a/src/rocksdb/db/version_builder.h b/src/rocksdb/db/version_builder.h
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+++ b/src/rocksdb/db/version_builder.h
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+//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under both the GPLv2 (found in the
+//  COPYING file in the root directory) and Apache 2.0 License
+//  (found in the LICENSE.Apache file in the root directory).
+//
+// 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.
+//
+#pragma once
+#include "rocksdb/file_system.h"
+#include "rocksdb/slice_transform.h"
+
+namespace ROCKSDB_NAMESPACE {
+
+class TableCache;
+class VersionStorageInfo;
+class VersionEdit;
+struct FileMetaData;
+class InternalStats;
+
+// A helper class so we can efficiently apply a whole sequence
+// of edits to a particular state without creating intermediate
+// Versions that contain full copies of the intermediate state.
+class VersionBuilder {
+ public:
+  VersionBuilder(const FileOptions& file_options, TableCache* table_cache,
+                 VersionStorageInfo* base_vstorage, Logger* info_log = nullptr);
+  ~VersionBuilder();
+  Status CheckConsistency(VersionStorageInfo* vstorage);
+  Status CheckConsistencyForDeletes(VersionEdit* edit, uint64_t number,
+                                    int level);
+  bool CheckConsistencyForNumLevels();
+  Status Apply(VersionEdit* edit);
+  Status SaveTo(VersionStorageInfo* vstorage);
+  Status LoadTableHandlers(InternalStats* internal_stats, int max_threads,
+                           bool prefetch_index_and_filter_in_cache,
+                           bool is_initial_load,
+                           const SliceTransform* prefix_extractor);
+  void MaybeAddFile(VersionStorageInfo* vstorage, int level, FileMetaData* f);
+
+ private:
+  class Rep;
+  Rep* rep_;
+};
+
+extern bool NewestFirstBySeqNo(FileMetaData* a, FileMetaData* b);
+}  // namespace ROCKSDB_NAMESPACE