0a1d189e50
This is a no-op change because rtc::Optional is an alias to absl::optional
This CL generated by running script with parameter 'rtc_base'
Then manually fix where Optional was used without rtc prefix (patchset#3)
find $@ -type f \( -name \*.h -o -name \*.cc \) \
-exec sed -i 's|rtc::Optional|absl::optional|g' {} \+ \
-exec sed -i 's|rtc::nullopt|absl::nullopt|g' {} \+ \
-exec sed -i 's|#include "api/optional.h"|#include "absl/types/optional.h"|' {} \+
find $@ -type f -name BUILD.gn \
-exec sed -r -i 's|"[\./api]*:optional"|"//third_party/abseil-cpp/absl/types:optional"|' {} \+;
git cl format
Bug: webrtc:9078
Change-Id: I825f80cc8089747876ba6316d9e7c30e05716974
Reviewed-on: https://webrtc-review.googlesource.com/84585
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23700}
83 lines
2.5 KiB
C++
83 lines
2.5 KiB
C++
/*
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* Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include <limits>
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#include "rtc_base/checks.h"
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#include "rtc_base/numerics/safe_conversions.h"
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#include "rtc_base/numerics/sample_counter.h"
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namespace rtc {
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SampleCounter::SampleCounter() = default;
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SampleCounter::~SampleCounter() = default;
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void SampleCounter::Add(int sample) {
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if (sum_ > 0) {
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RTC_DCHECK_LE(sample, std::numeric_limits<int64_t>::max() - sum_);
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} else {
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RTC_DCHECK_GE(sample, std::numeric_limits<int64_t>::min() - sum_);
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}
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sum_ += sample;
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// Prevent overflow in squaring.
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RTC_DCHECK_GT(sample, std::numeric_limits<int32_t>::min());
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RTC_DCHECK_LE(int64_t{sample} * sample,
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std::numeric_limits<int64_t>::max() - sum_squared_);
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sum_squared_ += int64_t{sample} * sample;
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++num_samples_;
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if (!max_ || sample > *max_) {
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max_ = sample;
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}
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}
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void SampleCounter::Add(const SampleCounter& other) {
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if (sum_ > 0) {
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RTC_DCHECK_LE(other.sum_, std::numeric_limits<int64_t>::max() - sum_);
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} else {
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RTC_DCHECK_GE(other.sum_, std::numeric_limits<int64_t>::min() - sum_);
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}
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sum_ += other.sum_;
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RTC_DCHECK_LE(other.sum_squared_,
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std::numeric_limits<int64_t>::max() - sum_squared_);
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sum_squared_ += other.sum_squared_;
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RTC_DCHECK_LE(other.num_samples_,
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std::numeric_limits<int64_t>::max() - num_samples_);
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num_samples_ += other.num_samples_;
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if (other.max_ && (!max_ || *max_ < *other.max_))
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max_ = other.max_;
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}
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absl::optional<int> SampleCounter::Avg(int64_t min_required_samples) const {
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RTC_DCHECK_GT(min_required_samples, 0);
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if (num_samples_ < min_required_samples)
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return absl::nullopt;
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return rtc::dchecked_cast<int>(sum_ / num_samples_);
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}
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absl::optional<int64_t> SampleCounter::Variance(
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int64_t min_required_samples) const {
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RTC_DCHECK_GT(min_required_samples, 0);
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if (num_samples_ < min_required_samples)
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return absl::nullopt;
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// E[(x-mean)^2] = E[x^2] - mean^2
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int64_t mean = sum_ / num_samples_;
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return sum_squared_ / num_samples_ - mean * mean;
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}
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absl::optional<int> SampleCounter::Max() const {
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return max_;
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}
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void SampleCounter::Reset() {
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*this = {};
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}
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} // namespace rtc
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