chromium/third_party/leveldatabase/src/include/leveldb/iterator.h

// 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.
//
// An iterator yields a sequence of key/value pairs from a source.
// The following class defines the interface.  Multiple implementations
// are provided by this library.  In particular, iterators are provided
// to access the contents of a Table or a DB.
//
// Multiple threads can invoke const methods on an Iterator without
// external synchronization, but if any of the threads may call a
// non-const method, all threads accessing the same Iterator must use
// external synchronization.

#ifndef STORAGE_LEVELDB_INCLUDE_ITERATOR_H_
#define STORAGE_LEVELDB_INCLUDE_ITERATOR_H_

#include "leveldb/export.h"
#include "leveldb/slice.h"
#include "leveldb/status.h"

namespace leveldb {

class LEVELDB_EXPORT Iterator { … };

// Return an empty iterator (yields nothing).
LEVELDB_EXPORT Iterator* NewEmptyIterator();

// Return an empty iterator with the specified status.
LEVELDB_EXPORT Iterator* NewErrorIterator(const Status& status);

}  // namespace leveldb

#endif  // STORAGE_LEVELDB_INCLUDE_ITERATOR_H_