Qt多线程QtConcurrent类

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最近在学习Qt多线程，发现QtConcurrent代码简单粗暴，尝试着用。

发现并行计算的函数好像不能使类方法：

#include <QtWidgets>
#include <QtConcurrent>

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();
}

如上面程序的 futureWatcher.setFuture(QtConcurrent::map(vector, spin));这一句，

spin后面是不带参数的，当它不是类的方法时，上面这句调试能够通过，但当其位类的方法时，调试提示说缺少参数，

难道是类方法就不行？！

明晚接着研究

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