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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_
#pragma once
#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_