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51 lines
1.5 KiB
C++
51 lines
1.5 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// SampleMap implements HistogramSamples interface. It is used by the
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// SparseHistogram class to store samples.
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#ifndef BASE_METRICS_SAMPLE_MAP_H_
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#define BASE_METRICS_SAMPLE_MAP_H_
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#include <stdint.h>
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#include <map>
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#include <memory>
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#include "base/compiler_specific.h"
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#include "base/macros.h"
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#include "base/metrics/histogram_base.h"
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#include "base/metrics/histogram_samples.h"
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namespace base {
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// The logic here is similar to that of PersistentSampleMap but with different
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// data structures. Changes here likely need to be duplicated there.
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class BASE_EXPORT SampleMap : public HistogramSamples {
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public:
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SampleMap();
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explicit SampleMap(uint64_t id);
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~SampleMap() override;
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// HistogramSamples:
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void Accumulate(HistogramBase::Sample value,
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HistogramBase::Count count) override;
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HistogramBase::Count GetCount(HistogramBase::Sample value) const override;
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HistogramBase::Count TotalCount() const override;
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std::unique_ptr<SampleCountIterator> Iterator() const override;
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protected:
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// Performs arithemetic. |op| is ADD or SUBTRACT.
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bool AddSubtractImpl(SampleCountIterator* iter, Operator op) override;
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private:
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std::map<HistogramBase::Sample, HistogramBase::Count> sample_counts_;
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DISALLOW_COPY_AND_ASSIGN(SampleMap);
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};
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} // namespace base
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#endif // BASE_METRICS_SAMPLE_MAP_H_
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