82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
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/**
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* Furnace Tracker - multi-system chiptune tracker
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* Copyright (C) 2021-2023 tildearrow and contributors
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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 of the License, or
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* (at your option) 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef _FIXED_QUEUE_H
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#define _FIXED_QUEUE_H
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#include <stdint.h>
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#include "../ta-log.h"
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template<typename T, size_t items> struct FixedQueue {
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size_t readPos, writePos;
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T data[items];
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T& front();
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bool pop();
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bool push(const T& item);
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void clear();
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bool empty();
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size_t size();
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FixedQueue():
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readPos(0),
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writePos(0) {}
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};
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template <typename T, size_t items> T& FixedQueue<T,items>::front() {
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return data[readPos];
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}
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template <typename T, size_t items> bool FixedQueue<T,items>::pop() {
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if (readPos==writePos) return false;
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if (++readPos>=items) readPos=0;
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return true;
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}
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template <typename T, size_t items> bool FixedQueue<T,items>::push(const T& item) {
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if (writePos==(readPos-1)) {
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logW("queue overflow!");
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return false;
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}
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if (writePos==0 && readPos==items-1) {
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logW("queue overflow!");
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return false;
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}
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data[writePos]=item;
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if (++writePos>=items) writePos=0;
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return true;
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}
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template <typename T, size_t items> void FixedQueue<T,items>::clear() {
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readPos=0;
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writePos=0;
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}
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template <typename T, size_t items> bool FixedQueue<T,items>::empty() {
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return (readPos==writePos);
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}
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template <typename T, size_t items> size_t FixedQueue<T,items>::size() {
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if (readPos>writePos) {
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return items+writePos-readPos;
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}
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return writePos-readPos;
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}
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#endif
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