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/****************************************************************************
**
** Copyright (C) 2020 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Linguist of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef SYNCHRONIZED_H
#define SYNCHRONIZED_H
#include <QtCore/qmutex.h>
#include <atomic>
#include <vector>
QT_BEGIN_NAMESPACE
template<typename T> class WriteSynchronizedRef
{
Q_DISABLE_COPY_MOVE(WriteSynchronizedRef)
public:
WriteSynchronizedRef(std::vector<T> &vector) Q_DECL_NOEXCEPT
: m_vector(vector)
{}
void emplace_back(T &&value)
{
QMutexLocker lock(&m_mutex);
m_vector.push_back(std::move(value));
}
void emplace_back(const T &value)
{
QMutexLocker lock(&m_mutex);
m_vector.emplace_back(value);
}
void emplace_bulk(std::vector<T> && values)
{
QMutexLocker lock(&m_mutex);
if (!m_vector.empty()) {
m_vector.insert(m_vector.cend(), std::make_move_iterator(values.begin()),
std::make_move_iterator(values.end()));
} else {
m_vector = std::move(values);
}
}
private:
mutable QMutex m_mutex;
std::vector<T> &m_vector;
};
template<typename T> class ReadSynchronizedRef
{
Q_DISABLE_COPY_MOVE(ReadSynchronizedRef)
public:
ReadSynchronizedRef(const std::vector<T> &v) noexcept
: m_vector(v)
{}
size_t size() const
{
return m_vector.size();
}
bool next(T *value) const
{
const auto idx = m_next.fetch_add(1, std::memory_order_acquire);
const bool hasNext = idx < m_vector.size();
if (hasNext)
*value = m_vector[idx];
return hasNext;
}
private:
const std::vector<T> &m_vector;
mutable std::atomic<size_t> m_next = 0;
};
QT_END_NAMESPACE
#endif
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