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#include <QtCore>

void slowOperation1()
{
    static char buf[256];
    for (int i = 0; i < (1<<20); ++i)
        buf[i % sizeof buf] = i;
}

void slowOperation2(int) { slowOperation1(); }

void startExample()
{
//![0]
    timer = QElapsedTimer()
    timer.start()

    slowOperation1()

    sys.stderr.write("The slow operation took" + timer.elapsed() + "milliseconds")
//![0]
}

//![1]
def executeSlowOperations(timeout):
    timer = QElapsedTimer()
    timer.start()
    slowOperation1()

    remainingTime = timeout - timer.elapsed()
    if remainingTime > 0:
        slowOperation2(remainingTime)
//![1]

//![2]
def executeOperationsForTime(ms):
    timer = QElapsedTimer()
    timer.start()

    while not timer.hasExpired(ms):
        slowOperation1()
//![2]

int restartExample()
{
//![3]
    timer = QElapsedTimer()

    count = 1
    timer.start()

    while True:
        count *= 2
        slowOperation2(count)
        if timer.restart() < 250:
            break

    return count
//![3]
}

int main(int argc, char **argv)
{
    QCoreApplication app(argc, argv);

    startExample();
    restartExample();
    executeSlowOperations(5);
    executeOperationsForTime(5);
}