// 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 #include #include #include "base/base_export.h" #include "base/compiler_specific.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(const SampleMap&) = delete; SampleMap& operator=(const SampleMap&) = delete; ~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 Iterator() const override; protected: // Performs arithemetic. |op| is ADD or SUBTRACT. bool AddSubtractImpl(SampleCountIterator* iter, Operator op) override; private: std::map sample_counts_; }; } // namespace base #endif // BASE_METRICS_SAMPLE_MAP_H_