sync/syncable/syncable_read_transaction.h

   1 // Copyright 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef SYNC_SYNCABLE_SYNCABLE_READ_TRANSACTION_H_
   6 #define SYNC_SYNCABLE_SYNCABLE_READ_TRANSACTION_H_
   7
   8 #include "sync/base/sync_export.h"
   9 #include "sync/syncable/syncable_base_transaction.h"
  10
  11 namespace syncer {
  12 class ReadTransaction;
  13 namespace syncable {
  14
  15 // Locks db in constructor, unlocks in destructor.
  16 class SYNC_EXPORT ReadTransaction : public BaseTransaction {
  17  public:
  18   ReadTransaction(const tracked_objects::Location& from_here,
  19                   Directory* directory);
  20
  21   ~ReadTransaction() override;
  22
  23  protected:  // Don't allow creation on heap, except by sync API wrapper.
  24   friend class syncer::ReadTransaction;
  25   void* operator new(size_t size) { return (::operator new)(size); }
  26
  27   DISALLOW_COPY_AND_ASSIGN(ReadTransaction);
  28 };
  29
  30 }  // namespace syncable
  31 }  // namespace syncer
  32
  33 #endif  // SYNC_SYNCABLE_SYNCABLE_READ_TRANSACTION_H_