ab9f4d5db6
I updated signals and slots and for each loops to the new syntax and replaced most free functions with std::function. Task-number: QTBUG-60641 Change-Id: I7693f81f71c7f53fcbe83189a0de2fb76ddf99a8 Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
101 lines
4.0 KiB
C++
101 lines
4.0 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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** $QT_BEGIN_LICENSE:BSD$
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** BSD License Usage
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** Alternatively, you may use this file under the terms of the BSD license
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** as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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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 vector.
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QVector<int> vector;
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for (int i = 0; i < iterations; ++i)
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vector.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(vector, 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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