Revision created by MOE tool push_codebase.

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git-svn-id: https://leveldb.googlecode.com/svn/trunk@22 62dab493-f737-651d-591e-8d6aee1b9529

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diff --git a/table/iterator_wrapper.h b/table/iterator_wrapper.h
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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_ITERATOR_WRAPPER_H_
-#define STORAGE_LEVELDB_TABLE_ITERATOR_WRAPPER_H_
-
-namespace leveldb {
-
-// A internal wrapper class with an interface similar to Iterator that
-// caches the valid() and key() results for an underlying iterator.
-// This can help avoid virtual function calls and also gives better
-// cache locality.
-class IteratorWrapper {
- private:
-  Iterator* iter_;
-  bool valid_;
-  Slice key_;
- public:
-  IteratorWrapper(): iter_(NULL), valid_(false) { }
-  explicit IteratorWrapper(Iterator* iter): iter_(NULL) {
-    Set(iter);
-  }
-  ~IteratorWrapper() { delete iter_; }
-  Iterator* iter() const { return iter_; }
-
-  // Takes ownership of "iter" and will delete it when destroyed, or
-  // when Set() is invoked again.
-  void Set(Iterator* iter) {
-    delete iter_;
-    iter_ = iter;
-    if (iter_ == NULL) {
-      valid_ = false;
-    } else {
-      Update();
-    }
-  }
-
-
-  // Iterator interface methods
-  bool Valid() const { return valid_; }
-  Slice key() const { assert(Valid()); return key_; }
-  Slice value() const { assert(Valid()); return iter_->value(); }
-  // Methods below require iter() != NULL
-  Status status() const { assert(iter_); return iter_->status(); }
-  void Next() { assert(iter_); iter_->Next(); Update(); }
-  void Prev() { assert(iter_); iter_->Prev(); Update(); }
-  void Seek(const Slice& k) { assert(iter_); iter_->Seek(k); Update(); }
-  void SeekToFirst() { assert(iter_); iter_->SeekToFirst(); Update(); }
-  void SeekToLast() { assert(iter_); iter_->SeekToLast(); Update(); }
-
- private:
-  void Update() {
-    valid_ = iter_->Valid();
-    if (valid_) {
-      key_ = iter_->key();
-    }
-  }
-};
-
-}
-
-
-#endif  // STORAGE_LEVELDB_TABLE_ITERATOR_WRAPPER_H_