114 lines
2.5 KiB
C++
114 lines
2.5 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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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 3 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
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "bagel/boflib/queue.h"
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#include "bagel/boflib/stdinc.h"
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namespace Bagel {
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CQueue::CQueue() {
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}
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CQueue::~CQueue() {
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// Can't destruct if we don't exist
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assert(isValidObject(this));
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while (removeItem() != nullptr) {
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}
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// remove() must set _pQueueList to nullptr when it removes the last item
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assert(_pQueueList == nullptr);
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}
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void CQueue::addItem(void *pObject) {
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// Make sure this object exists
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assert(isValidObject(this));
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CLList *pNewItem = new CLList(pObject);
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if (_pQueueList != nullptr) {
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_pQueueList->addToTail(pNewItem);
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} else {
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_pQueueList = pNewItem;
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}
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assert(pNewItem->getHead() == _pQueueList);
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}
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void *CQueue::removeItem() {
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// Make sure this object exists
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assert(isValidObject(this));
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// Assume empty list
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void *pObject = nullptr;
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CLList *pList = _pQueueList;
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if (pList != nullptr) {
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pObject = pList->getData();
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_pQueueList = pList->getNext();
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delete pList;
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}
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return pObject;
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}
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void CQueue::deleteItem(void *pItem) {
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// Make sure this object exists
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assert(isValidObject(this));
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assert(pItem != nullptr);
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CLList *pList = _pQueueList;
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while (pList != nullptr) {
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CLList *pNext = pList->getNext();
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if (pItem == pList->getData()) {
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// If this is the 1st item in the Queue, then move head
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if (pList == _pQueueList)
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_pQueueList = _pQueueList->getNext();
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delete pList;
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break;
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}
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pList = pNext;
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}
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}
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void *CQueue::getQItem() {
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assert(isValidObject(this));
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void *pItem = nullptr;
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if (_pQueueList != nullptr) {
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pItem = _pQueueList->getData();
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}
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return pItem;
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}
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void CQueue::flush() {
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assert(isValidObject(this));
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while (removeItem() != nullptr) {
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}
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}
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} // namespace Bagel
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