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 // Copyright (c) 2006-2008 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 BASE_ATOMIC_SEQUENCE_NUM_H_

 #define BASE_ATOMIC_SEQUENCE_NUM_H_

 #include "base/atomicops.h"

 #include "base/basictypes.h"

 namespace base {

 class AtomicSequenceNumber {

  public:

   AtomicSequenceNumber() : seq_(0) { }

   explicit AtomicSequenceNumber(base::LinkerInitialized x) { /* seq_ is 0 */ }

   int GetNext() {

     return static_cast<int>(

         base::subtle::NoBarrier_AtomicIncrement(&seq_, 1) - 1);

   }

  private:

   base::subtle::Atomic32 seq_;

   DISALLOW_COPY_AND_ASSIGN(AtomicSequenceNumber);

 };

 }  // namespace base

 #endif  // BASE_ATOMIC_SEQUENCE_NUM_H_