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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.
// SampleMap implements HistogramSamples interface. It is used by the
// SparseHistogram class to store samples.
#ifndef BASE_METRICS_SAMPLE_MAP_H_
#define BASE_METRICS_SAMPLE_MAP_H_
#include <stdint.h>
#include <map>
#include <memory>
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/metrics/histogram_base.h"
#include "base/metrics/histogram_samples.h"
namespace base {
// The logic here is similar to that of PersistentSampleMap but with different
// data structures. Changes here likely need to be duplicated there.
class BASE_EXPORT SampleMap : public HistogramSamples {
public:
SampleMap();
explicit SampleMap(uint64_t id);
~SampleMap() override;
// HistogramSamples:
void Accumulate(HistogramBase::Sample value,
HistogramBase::Count count) override;
HistogramBase::Count GetCount(HistogramBase::Sample value) const override;
HistogramBase::Count TotalCount() const override;
std::unique_ptr<SampleCountIterator> Iterator() const override;
protected:
// Performs arithemetic. |op| is ADD or SUBTRACT.
bool AddSubtractImpl(SampleCountIterator* iter, Operator op) override;
private:
std::map<HistogramBase::Sample, HistogramBase::Count> sample_counts_;
DISALLOW_COPY_AND_ASSIGN(SampleMap);
};
} // namespace base
#endif // BASE_METRICS_SAMPLE_MAP_H_