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// Copyright (c) 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 BASE_METRICS_HISTOGRAM_FLATTENER_H_
#define BASE_METRICS_HISTOGRAM_FLATTENER_H_
#include <map>
#include <string>
#include "base/metrics/histogram.h"
namespace base {
class HistogramSamples;
// HistogramFlattener is an interface used by HistogramSnapshotManager, which
// handles the logistics of gathering up available histograms for recording.
class BASE_EXPORT HistogramFlattener {
public:
HistogramFlattener(const HistogramFlattener&) = delete;
HistogramFlattener& operator=(const HistogramFlattener&) = delete;
virtual ~HistogramFlattener() = default;
virtual void RecordDelta(const HistogramBase& histogram,
const HistogramSamples& snapshot) = 0;
protected:
HistogramFlattener() = default;
};
} // namespace base
#endif // BASE_METRICS_HISTOGRAM_FLATTENER_H_
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