chromium/base/metrics/sparse_histogram.h

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

#ifndef BASE_METRICS_SPARSE_HISTOGRAM_H_
#define BASE_METRICS_SPARSE_HISTOGRAM_H_

#include <stddef.h>
#include <stdint.h>

#include <map>
#include <memory>
#include <string>

#include "base/base_export.h"
#include "base/metrics/histogram_base.h"
#include "base/metrics/histogram_samples.h"
#include "base/synchronization/lock.h"
#include "base/values.h"

namespace base {

class HistogramSamples;
class PersistentHistogramAllocator;
class Pickle;
class PickleIterator;

class BASE_EXPORT SparseHistogram : public HistogramBase { … };

}  // namespace base

#endif  // BASE_METRICS_SPARSE_HISTOGRAM_H_