05fc3aef53
Replace the current license disclaimer in files by a SPDX-License-Identifier. Files that have to be modified by hand are modified. License files are organized under LICENSES directory. Task-number: QTBUG-67283 Change-Id: Id880c92784c40f3bbde861c0d93f58151c18b9f1 Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org> Reviewed-by: Lars Knoll <lars.knoll@qt.io> Reviewed-by: Jörg Bornemann <joerg.bornemann@qt.io>
54 lines
1.7 KiB
C++
54 lines
1.7 KiB
C++
// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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#include <QtWidgets>
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#include <QtConcurrent>
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#include <functional>
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using namespace QtConcurrent;
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int main(int argc, char **argv)
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{
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QApplication app(argc, argv);
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const int iterations = 20;
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// Prepare the list.
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QList<int> list;
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for (int i = 0; i < iterations; ++i)
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list.append(i);
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// Create a progress dialog.
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QProgressDialog dialog;
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dialog.setLabelText(QString("Progressing using %1 thread(s)...").arg(QThread::idealThreadCount()));
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// Create a QFutureWatcher and connect signals and slots.
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QFutureWatcher<void> futureWatcher;
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QObject::connect(&futureWatcher, &QFutureWatcher<void>::finished, &dialog, &QProgressDialog::reset);
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QObject::connect(&dialog, &QProgressDialog::canceled, &futureWatcher, &QFutureWatcher<void>::cancel);
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QObject::connect(&futureWatcher, &QFutureWatcher<void>::progressRangeChanged, &dialog, &QProgressDialog::setRange);
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QObject::connect(&futureWatcher, &QFutureWatcher<void>::progressValueChanged, &dialog, &QProgressDialog::setValue);
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// Our function to compute
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std::function<void(int&)> spin = [](int &iteration) {
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const int work = 1000 * 1000 * 40;
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volatile int v = 0;
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for (int j = 0; j < work; ++j)
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++v;
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qDebug() << "iteration" << iteration << "in thread" << QThread::currentThreadId();
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};
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// Start the computation.
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futureWatcher.setFuture(QtConcurrent::map(list, spin));
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// Display the dialog and start the event loop.
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dialog.exec();
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futureWatcher.waitForFinished();
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// Query the future to check if was canceled.
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qDebug() << "Canceled?" << futureWatcher.future().isCanceled();
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}
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