chromium/base/metrics/sample_vector.h

// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40284755): Remove this and spanify to fix the errors.
#pragma allow_unsafe_buffers
#endif

// SampleVector implements HistogramSamples interface. It is used by all
// Histogram based classes to store samples.

#ifndef BASE_METRICS_SAMPLE_VECTOR_H_
#define BASE_METRICS_SAMPLE_VECTOR_H_

#include <stddef.h>
#include <stdint.h>

#include <atomic>
#include <memory>
#include <string>
#include <string_view>
#include <vector>

#include "base/base_export.h"
#include "base/compiler_specific.h"
#include "base/containers/span.h"
#include "base/gtest_prod_util.h"
#include "base/memory/raw_ptr.h"
#include "base/metrics/bucket_ranges.h"
#include "base/metrics/histogram_base.h"
#include "base/metrics/histogram_samples.h"
#include "base/metrics/persistent_memory_allocator.h"

namespace base {

class BucketRanges;

class BASE_EXPORT SampleVectorBase : public HistogramSamples { … };

// A sample vector that uses local memory for the counts array.
class BASE_EXPORT SampleVector : public SampleVectorBase { … };

// A sample vector that uses persistent memory for the counts array.
class BASE_EXPORT PersistentSampleVector : public SampleVectorBase { … };

}  // namespace base

#endif  // BASE_METRICS_SAMPLE_VECTOR_H_