Qt 4.4: main.cpp Example File (qtconcurrent/map/main.cpp)

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# main.cpp Example File
qtconcurrent/map/main.cpp

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     #include <QImage>
     #include <QList>
     #include <QThread>
     #include <QDebug>
     #include <qtconcurrentmap.h>

     #ifndef QT_NO_CONCURRENT

     QImage scale(const QImage &image)
     {
         qDebug() << "Scaling image in thread" << QThread::currentThread();
         return image.scaled(QSize(100, 100), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
     }

     int main(int argc, char *argv[])
     {
         Q_UNUSED(argc);
         Q_UNUSED(argv);

         const int imageCount = 20;

         // Create a list containing imageCount images.
         QList<QImage> images;
         for (int i = 0; i < imageCount; ++i)
             images.append(QImage(1600, 1200, QImage::Format_ARGB32_Premultiplied));

         // Use QtConcurrentBlocking::mapped to apply the scale function to all the
         // images in the list.
         QList<QImage> thumbnails = QtConcurrent::blockingMapped(images, scale);

         return 0;
     }

     #else

     int main()
     {
             qDebug() << "Qt Concurrent is not yet supported on this platform";
     }

     #endif