/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the examples of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:BSD$

** You may use this file under the terms of the BSD license as follows:

**

** "Redistribution and use in source and binary forms, with or without

** modification, are permitted provided that the following conditions are

** met:

**   * Redistributions of source code must retain the above copyright

**     notice, this list of conditions and the following disclaimer.

**   * Redistributions in binary form must reproduce the above copyright

**     notice, this list of conditions and the following disclaimer in

**     the documentation and/or other materials provided with the

**     distribution.

**   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor

**     the names of its contributors may be used to endorse or promote

**     products derived from this software without specific prior written

**     permission.

**

** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."

** $QT_END_LICENSE$

**

****************************************************************************/

#include <QtGui>

#ifndef QT_NO_CONCURRENT

using namespace QtConcurrent;

const int iterations = 20;

void spin(int &iteration)

{

    const int work = 1000 * 1000 * 40;

    volatile int v = 0;

    for (int j = 0; j < work; ++j)

        ++v;

    qDebug() << "iteration" << iteration << "in thread" << QThread::currentThreadId();

}

int main(int argc, char **argv)

{

    QApplication app(argc, argv);

    // Prepare the vector.

    QVector<int> vector;

    for (int i = 0; i < iterations; ++i)

        vector.append(i);

    // Create a progress dialog.

    QProgressDialog dialog;

    dialog.setLabelText(QString("Progressing using %1 thread(s)...").arg(QThread::idealThreadCount()));

    // Create a QFutureWatcher and connect signals and slots.

    QFutureWatcher<void> futureWatcher;

    QObject::connect(&futureWatcher, SIGNAL(finished()), &dialog, SLOT(reset()));

    QObject::connect(&dialog, SIGNAL(canceled()), &futureWatcher, SLOT(cancel()));

    QObject::connect(&futureWatcher, SIGNAL(progressRangeChanged(int,int)), &dialog, SLOT(setRange(int,int)));

    QObject::connect(&futureWatcher, SIGNAL(progressValueChanged(int)), &dialog, SLOT(setValue(int)));

    // Start the computation.

    futureWatcher.setFuture(QtConcurrent::map(vector, spin));

    // Display the dialog and start the event loop.

    dialog.exec();

    futureWatcher.waitForFinished();

    // Query the future to check if was canceled.

    qDebug() << "Canceled?" << futureWatcher.future().isCanceled();

}

#else

int main()

{

	qDebug() << "Qt Concurrent is not yet supported on this platform";

}

#endif