mirror of
https://github.com/eried/portapack-mayhem.git
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98f3bf151f
* easier 'now', start adding text editor * Adding scrolling to notepad * Better scrolling * Better scrolling, off-by-1 bugs * MVP fit and finish * Add tiny font and use in Notepad * Font tweaking, tiny font cursor * Fix warning * Format changed files * WIP No file limit * WIP - adding CircularBuffer type * WIP Caching * add unit test for circular_buffer * WIP still have a bug when moving cache forward * Finish lazy line caching --------- Co-authored-by: kallanreed <kallanreed@outlook.com>
120 lines
3.0 KiB
C++
120 lines
3.0 KiB
C++
/*
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* Copyright (C) 2023 Kyle Reed
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*
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* This file is part of PortaPack.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __CIRCULAR_BUFFER_H__
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#define __CIRCULAR_BUFFER_H__
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#include <stddef.h> // For size_t
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#include <memory>
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/* Implements a fixed-size, circular buffer.
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* NB: Holds Capacity - 1 items.
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* There are no bounds checks on accessors so ensure there are
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* items in the buffer before accessing front/back/operator[]. */
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template <typename T, size_t Capacity>
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class CircularBuffer {
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public:
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CircularBuffer() = default;
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CircularBuffer(const CircularBuffer&) = delete;
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CircularBuffer(CircularBuffer&&) = delete;
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CircularBuffer& operator=(const CircularBuffer&) = delete;
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CircularBuffer& operator=(CircularBuffer&&) = delete;
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void push_front(T val) {
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head_ = head_ > 0 ? head_ - 1 : last_index;
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if (head_ == end_)
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pop_back_internal();
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data_[head_] = std::move(val);
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}
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void pop_front() {
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if (!empty())
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pop_front_internal();
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}
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void push_back(T val) {
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data_[end_] = std::move(val);
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end_ = end_ < last_index ? end_ + 1 : 0;
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if (head_ == end_)
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pop_front_internal();
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}
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void pop_back() {
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if (!empty())
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pop_back_internal();
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}
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T& operator[](size_t ix) & {
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ix += head_;
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if (ix >= Capacity)
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ix -= Capacity;
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return data_[ix];
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}
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const T& operator[](size_t ix) const& {
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return const_cast<CircularBuffer*>(this)->operator[](ix);
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}
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const T& front() const& {
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return data_[head_];
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}
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const T& back() const& {
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auto end = end_ > 0 ? end_ - 1 : last_index;
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return data_[end];
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}
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size_t size() const& {
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auto end = end_;
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if (end < head_)
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end += Capacity;
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return end - head_;
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}
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bool empty() const {
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return head_ == end_;
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}
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void clear() {
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head_ = 0;
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end_ = 0;
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}
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private:
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void pop_front_internal() {
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head_ = head_ < last_index ? head_ + 1 : 0;
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}
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void pop_back_internal() {
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end_ = end_ > 0 ? end_ - 1 : last_index;
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}
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static constexpr size_t last_index = Capacity - 1;
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size_t head_{0};
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size_t end_{0};
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T data_[Capacity]{};
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};
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#endif /*__CIRCULAR_BUFFER_H__*/ |