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// Copyright 2017 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 DEVICE_VR_UTIL_SAMPLE_QUEUE_H_
#define DEVICE_VR_UTIL_SAMPLE_QUEUE_H_
#include <cstddef>
#include <vector>
#include "base/macros.h"
#include "device/vr/vr_export.h"
namespace device {
// Manages a fixed-size queue of samples including their current sum. Old
// samples are automatically dropped when an added sample would exceed the
// requested size.
class DEVICE_VR_EXPORT SampleQueue {
public:
explicit SampleQueue(size_t window_size);
~SampleQueue();
int64_t GetSum() const { return sum_; }
void AddSample(int64_t value);
size_t GetCount() const { return samples_.size(); }
// Get sliding window size for tests.
size_t GetWindowSize() const { return window_size_; }
private:
int64_t sum_ = 0;
size_t current_index_ = 0;
size_t window_size_;
std::vector<int64_t> samples_;
DISALLOW_COPY_AND_ASSIGN(SampleQueue);
};
} // namespace device
#endif // DEVICE_VR_UTIL_SAMPLE_QUEUE_H_
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