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/*
* This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef TRINITYCORE_LOCKED_QUEUE_H
#define TRINITYCORE_LOCKED_QUEUE_H
#include "Concepts.h"
#include <deque>
#include <mutex>
template <class T, typename StorageType = std::deque<T>>
class LockedQueue
{
//! Lock access to the queue.
std::mutex _lock;
//! Storage backing the queue.
StorageType _queue;
//! Cancellation flag.
bool _canceled = false;
public:
//! Adds an item to the queue.
void add(T const& item)
{
std::lock_guard<std::mutex> lock(_lock);
_queue.push_back(item);
}
//! Adds an item to the queue.
void add(T&& item)
{
std::lock_guard<std::mutex> lock(_lock);
_queue.push_back(std::move(item));
}
//! Adds items back to front of the queue
template<std::input_iterator Iterator>
void readd(Iterator begin, Iterator end)
{
std::lock_guard<std::mutex> lock(_lock);
_queue.insert(_queue.begin(), begin, end);
}
//! Gets the next result in the queue, if any.
bool next(T& result)
{
std::lock_guard<std::mutex> lock(_lock);
if (_queue.empty())
return false;
result = std::move(_queue.front());
_queue.pop_front();
return true;
}
template<class Checker>
bool next(T& result, Checker& check)
{
std::lock_guard<std::mutex> lock(_lock);
if (_queue.empty())
return false;
decltype(auto) front = _queue.front();
if (!check.Process(front))
return false;
result = std::move(front);
_queue.pop_front();
return true;
}
//! Cancels the queue.
void cancel()
{
std::lock_guard<std::mutex> lock(_lock);
_canceled = true;
}
//! Checks if the queue is cancelled.
bool cancelled()
{
std::lock_guard<std::mutex> lock(_lock);
return _canceled;
}
///! Calls pop_front of the queue
void pop_front()
{
std::lock_guard<std::mutex> lock(_lock);
_queue.pop_front();
}
///! Checks if we're empty or not with locks held
bool empty()
{
std::lock_guard<std::mutex> lock(_lock);
return _queue.empty();
}
};
#endif
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