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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QFUTURESYNCHRONIZER_H
#define QFUTURESYNCHRONIZER_H
#include <QtCore/qfuture.h>
QT_REQUIRE_CONFIG(future);
QT_BEGIN_NAMESPACE
template <typename T>
class QFutureSynchronizer
{
Q_DISABLE_COPY(QFutureSynchronizer)
public:
QFutureSynchronizer() : m_cancelOnWait(false) { }
explicit QFutureSynchronizer(const QFuture<T> &future)
: m_cancelOnWait(false)
{ addFuture(future); }
~QFutureSynchronizer() { waitForFinished(); }
void setFuture(const QFuture<T> &future)
{
waitForFinished();
m_futures.clear();
addFuture(future);
}
void addFuture(const QFuture<T> &future)
{
m_futures.append(future);
}
void waitForFinished()
{
if (m_cancelOnWait) {
for (int i = 0; i < m_futures.size(); ++i) {
m_futures[i].cancel();
}
}
for (int i = 0; i < m_futures.size(); ++i) {
m_futures[i].waitForFinished();
}
}
void clearFutures()
{
m_futures.clear();
}
QList<QFuture<T> > futures() const
{
return m_futures;
}
void setCancelOnWait(bool enabled)
{
m_cancelOnWait = enabled;
}
bool cancelOnWait() const
{
return m_cancelOnWait;
}
protected:
QList<QFuture<T>> m_futures;
bool m_cancelOnWait;
};
QT_END_NAMESPACE
#endif // QFUTURESYNCHRONIZER_H
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