mirror of
https://github.com/wpilibsuite/allwpilib
synced 2026-06-22 01:11:42 +00:00
Move circular buffer class from wpilib to wpiutil (#1840)
This commit is contained in:
Tyler Veness
committed by
Peter Johnson
Peter Johnson
parent
4cd8a56672
commit
e3d86fee46
@@ -12,8 +12,7 @@
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#include <units/units.h>
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#include <wpi/ArrayRef.h>
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#include "frc/circular_buffer.h"
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#include <wpi/circular_buffer.h>
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namespace frc {
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@@ -142,8 +141,8 @@ class LinearFilter {
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double Calculate(double input);
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private:
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circular_buffer<double> m_inputs{0};
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circular_buffer<double> m_outputs{0};
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wpi::circular_buffer<double> m_inputs{0};
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wpi::circular_buffer<double> m_outputs{0};
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std::vector<double> m_inputGains;
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std::vector<double> m_outputGains;
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};
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@@ -1,62 +0,0 @@
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/*----------------------------------------------------------------------------*/
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/* Copyright (c) 2015-2018 FIRST. All Rights Reserved. */
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/* Open Source Software - may be modified and shared by FRC teams. The code */
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/* must be accompanied by the FIRST BSD license file in the root directory of */
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/* the project. */
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/*----------------------------------------------------------------------------*/
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#pragma once
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#include <cstddef>
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#include <vector>
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namespace frc {
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/**
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* This is a simple circular buffer so we don't need to "bucket brigade" copy
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* old values.
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*/
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template <class T>
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class circular_buffer {
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public:
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explicit circular_buffer(size_t size);
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using value_type = T;
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using reference = value_type&;
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using const_reference = const value_type&;
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using pointer = value_type*;
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using size_type = size_t;
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using iterator_category = std::forward_iterator_tag;
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using difference_type = std::ptrdiff_t;
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size_type size() const;
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T& front();
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const T& front() const;
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T& back();
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const T& back() const;
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void push_front(T value);
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void push_back(T value);
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T pop_front();
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T pop_back();
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void resize(size_t size);
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void reset();
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T& operator[](size_t index);
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const T& operator[](size_t index) const;
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private:
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std::vector<T> m_data;
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// Index of element at front of buffer
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size_t m_front = 0;
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// Number of elements used in buffer
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size_t m_length = 0;
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size_t ModuloInc(size_t index);
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size_t ModuloDec(size_t index);
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};
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} // namespace frc
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#include "frc/circular_buffer.inc"
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@@ -1,239 +0,0 @@
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/*----------------------------------------------------------------------------*/
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/* Copyright (c) 2015-2018 FIRST. All Rights Reserved. */
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/* Open Source Software - may be modified and shared by FRC teams. The code */
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/* must be accompanied by the FIRST BSD license file in the root directory of */
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/* the project. */
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/*----------------------------------------------------------------------------*/
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#pragma once
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#include <algorithm>
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namespace frc {
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template <class T>
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circular_buffer<T>::circular_buffer(size_t size) : m_data(size, 0) {}
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/**
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* Returns number of elements in buffer
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*/
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template <class T>
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typename circular_buffer<T>::size_type circular_buffer<T>::size() const {
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return m_length;
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}
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/**
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* Returns value at front of buffer
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*/
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template <class T>
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T& circular_buffer<T>::front() {
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return (*this)[0];
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}
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/**
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* Returns value at front of buffer
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*/
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template <class T>
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const T& circular_buffer<T>::front() const {
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return (*this)[0];
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}
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/**
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* Returns value at back of buffer
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*/
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template <class T>
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T& circular_buffer<T>::back() {
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// If there are no elements in the buffer, do nothing
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if (m_length == 0) {
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return 0;
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}
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return m_data[(m_front + m_length - 1) % m_data.size()];
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}
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/**
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* Returns value at back of buffer
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*/
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template <class T>
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const T& circular_buffer<T>::back() const {
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// If there are no elements in the buffer, do nothing
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if (m_length == 0) {
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return 0;
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}
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return m_data[(m_front + m_length - 1) % m_data.size()];
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}
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/**
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* Push new value onto front of the buffer. The value at the back is overwritten
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* if the buffer is full.
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*/
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template <class T>
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void circular_buffer<T>::push_front(T value) {
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if (m_data.size() == 0) {
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return;
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}
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m_front = ModuloDec(m_front);
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m_data[m_front] = value;
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if (m_length < m_data.size()) {
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m_length++;
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}
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}
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/**
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* Push new value onto back of the buffer. The value at the front is overwritten
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* if the buffer is full.
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*/
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template <class T>
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void circular_buffer<T>::push_back(T value) {
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if (m_data.size() == 0) {
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return;
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}
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m_data[(m_front + m_length) % m_data.size()] = value;
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if (m_length < m_data.size()) {
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m_length++;
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} else {
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// Increment front if buffer is full to maintain size
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m_front = ModuloInc(m_front);
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}
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}
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/**
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* Pop value at front of buffer.
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*/
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template <class T>
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T circular_buffer<T>::pop_front() {
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// If there are no elements in the buffer, do nothing
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if (m_length == 0) {
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return 0;
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}
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T& temp = m_data[m_front];
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m_front = ModuloInc(m_front);
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m_length--;
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return temp;
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}
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/**
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* Pop value at back of buffer.
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*/
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template <class T>
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T circular_buffer<T>::pop_back() {
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// If there are no elements in the buffer, do nothing
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if (m_length == 0) {
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return 0;
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}
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m_length--;
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return m_data[(m_front + m_length) % m_data.size()];
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}
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/**
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* Resizes internal buffer to given size.
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*/
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template <class T>
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void circular_buffer<T>::resize(size_t size) {
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if (size > m_data.size()) {
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// Find end of buffer
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size_t insertLocation = (m_front + m_length) % m_data.size();
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// If insertion location precedes front of buffer, push front index back
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if (insertLocation <= m_front) {
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m_front += size - m_data.size();
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}
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// Add elements to end of buffer
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m_data.insert(m_data.begin() + insertLocation, size - m_data.size(), 0);
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} else if (size < m_data.size()) {
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/* 1) Shift element block start at "front" left as many blocks as were
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* removed up to but not exceeding buffer[0]
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* 2) Shrink buffer, which will remove even more elements automatically if
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* necessary
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*/
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size_t elemsToRemove = m_data.size() - size;
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auto frontIter = m_data.begin() + m_front;
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if (m_front < elemsToRemove) {
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/* Remove elements from end of buffer before shifting start of element
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* block. Doing so saves a few copies.
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*/
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m_data.erase(frontIter + size, m_data.end());
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// Shift start of element block to left
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m_data.erase(m_data.begin(), frontIter);
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// Update metadata
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m_front = 0;
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} else {
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// Shift start of element block to left
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m_data.erase(frontIter - elemsToRemove, frontIter);
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// Update metadata
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m_front -= elemsToRemove;
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}
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/* Length only changes during a shrink if all unused spaces have been
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* removed. Length decreases as used spaces are removed to meet the
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* required size.
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*/
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if (m_length > size) {
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m_length = size;
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}
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}
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}
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/**
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* Sets internal buffer contents to zero.
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*/
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template <class T>
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void circular_buffer<T>::reset() {
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std::fill(m_data.begin(), m_data.end(), 0);
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m_front = 0;
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m_length = 0;
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}
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/**
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* @return Element at index starting from front of buffer.
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*/
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template <class T>
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T& circular_buffer<T>::operator[](size_t index) {
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return m_data[(m_front + index) % m_data.size()];
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}
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/**
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* @return Element at index starting from front of buffer.
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*/
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template <class T>
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const T& circular_buffer<T>::operator[](size_t index) const {
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return m_data[(m_front + index) % m_data.size()];
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}
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/**
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* Increment an index modulo the length of the buffer.
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*
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* @return The result of the modulo operation.
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*/
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template <class T>
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size_t circular_buffer<T>::ModuloInc(size_t index) {
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return (index + 1) % m_data.size();
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}
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/**
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* Decrement an index modulo the length of the buffer.
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*
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* @return The result of the modulo operation.
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*/
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template <class T>
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size_t circular_buffer<T>::ModuloDec(size_t index) {
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if (index == 0) {
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return m_data.size() - 1;
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} else {
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return index - 1;
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}
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}
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} // namespace frc
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@@ -12,9 +12,9 @@
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#include <vector>
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#include <wpi/ArrayRef.h>
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#include <wpi/circular_buffer.h>
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#include <wpi/deprecated.h>
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#include "frc/circular_buffer.h"
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#include "frc/filters/Filter.h"
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namespace frc {
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@@ -215,8 +215,8 @@ class LinearDigitalFilter : public Filter {
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double PIDGet() override;
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private:
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circular_buffer<double> m_inputs;
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circular_buffer<double> m_outputs;
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wpi::circular_buffer<double> m_inputs;
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wpi::circular_buffer<double> m_outputs;
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std::vector<double> m_inputGains;
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std::vector<double> m_outputGains;
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};
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