// 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 "base/base_export.h" #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_