sync/syncable/syncable_read_transaction.h

// Copyright 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef SYNC_SYNCABLE_SYNCABLE_READ_TRANSACTION_H_
#define SYNC_SYNCABLE_SYNCABLE_READ_TRANSACTION_H_

#include <stddef.h>

#include "base/macros.h"
#include "sync/base/sync_export.h"
#include "sync/syncable/syncable_base_transaction.h"

namespace syncer {
class ReadTransaction;
namespace syncable {

// Locks db in constructor, unlocks in destructor.
class SYNC_EXPORT ReadTransaction : public BaseTransaction {
 public:
  ReadTransaction(const tracked_objects::Location& from_here,
                  Directory* directory);

  ~ReadTransaction() override;

 protected:  // Don't allow creation on heap, except by sync API wrapper.
  void* operator new(size_t size) { return (::operator new)(size); }

 private:
  friend class syncer::ReadTransaction;

  DISALLOW_COPY_AND_ASSIGN(ReadTransaction);
};

}  // namespace syncable
}  // namespace syncer

#endif  // SYNC_SYNCABLE_SYNCABLE_READ_TRANSACTION_H_