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Unified Diff: webrtc/base/analytics/percentile_filter.h

Issue 2626203002: Rename base/analytics/ to base/numerics/ (Closed)
Patch Set: Rebase Created 3 years, 11 months ago
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Index: webrtc/base/analytics/percentile_filter.h
diff --git a/webrtc/base/analytics/percentile_filter.h b/webrtc/base/analytics/percentile_filter.h
deleted file mode 100644
index 7cfba5ad0039024e3de568de35cf81c4da361d57..0000000000000000000000000000000000000000
--- a/webrtc/base/analytics/percentile_filter.h
+++ /dev/null
@@ -1,115 +0,0 @@
-/*
- * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
- *
- * Use of this source code is governed by a BSD-style license
- * that can be found in the LICENSE file in the root of the source
- * tree. An additional intellectual property rights grant can be found
- * in the file PATENTS. All contributing project authors may
- * be found in the AUTHORS file in the root of the source tree.
- */
-
-#ifndef WEBRTC_BASE_ANALYTICS_PERCENTILE_FILTER_H_
-#define WEBRTC_BASE_ANALYTICS_PERCENTILE_FILTER_H_
-
-#include <stdint.h>
-
-#include <iterator>
-#include <set>
-
-#include "webrtc/base/checks.h"
-
-namespace webrtc {
-
-// Class to efficiently get the percentile value from a group of observations.
-// The percentile is the value below which a given percentage of the
-// observations fall.
-template <typename T>
-class PercentileFilter {
- public:
- // Construct filter. |percentile| should be between 0 and 1.
- explicit PercentileFilter(float percentile);
-
- // Insert one observation. The complexity of this operation is logarithmic in
- // the size of the container.
- void Insert(const T& value);
-
- // Remove one observation or return false if |value| doesn't exist in the
- // container. The complexity of this operation is logarithmic in the size of
- // the container.
- bool Erase(const T& value);
-
- // Get the percentile value. The complexity of this operation is constant.
- T GetPercentileValue() const;
-
- private:
- // Update iterator and index to point at target percentile value.
- void UpdatePercentileIterator();
-
- const float percentile_;
- std::multiset<T> set_;
- // Maintain iterator and index of current target percentile value.
- typename std::multiset<T>::iterator percentile_it_;
- int64_t percentile_index_;
-};
-
-template <typename T>
-PercentileFilter<T>::PercentileFilter(float percentile)
- : percentile_(percentile),
- percentile_it_(set_.begin()),
- percentile_index_(0) {
- RTC_CHECK_GE(percentile, 0.0f);
- RTC_CHECK_LE(percentile, 1.0f);
-}
-
-template <typename T>
-void PercentileFilter<T>::Insert(const T& value) {
- // Insert element at the upper bound.
- set_.insert(value);
- if (set_.size() == 1u) {
- // First element inserted - initialize percentile iterator and index.
- percentile_it_ = set_.begin();
- percentile_index_ = 0;
- } else if (value < *percentile_it_) {
- // If new element is before us, increment |percentile_index_|.
- ++percentile_index_;
- }
- UpdatePercentileIterator();
-}
-
-template <typename T>
-bool PercentileFilter<T>::Erase(const T& value) {
- typename std::multiset<T>::const_iterator it = set_.lower_bound(value);
- // Ignore erase operation if the element is not present in the current set.
- if (it == set_.end() || *it != value)
- return false;
- if (it == percentile_it_) {
- // If same iterator, update to the following element. Index is not
- // affected.
- percentile_it_ = set_.erase(it);
- } else {
- set_.erase(it);
- // If erased element was before us, decrement |percentile_index_|.
- if (value <= *percentile_it_)
- --percentile_index_;
- }
- UpdatePercentileIterator();
- return true;
-}
-
-template <typename T>
-void PercentileFilter<T>::UpdatePercentileIterator() {
- if (set_.empty())
- return;
- const int64_t index = static_cast<int64_t>(percentile_ * (set_.size() - 1));
- std::advance(percentile_it_, index - percentile_index_);
- percentile_index_ = index;
-}
-
-template <typename T>
-T PercentileFilter<T>::GetPercentileValue() const {
- return set_.empty() ? 0 : *percentile_it_;
-}
-
-} // namespace webrtc
-
-#endif // WEBRTC_BASE_ANALYTICS_PERCENTILE_FILTER_H_
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