Qt QtConcurrent::run()函数的两种写法

第一种，使用lambda表达式

1  QFuture<void> future = QtConcurrent::run([=]() {
2      // Code in this block will run in another thread
3  });
4  ...

第二种，使用成员函数

调用QByteArray的成员函数split()

1  // call 'QList<QByteArray>  QByteArray::split(char sep) const' in a separate thread
2  QByteArray bytearray = "hello world";
3  QFuture<QList<QByteArray> > future = QtConcurrent::run(bytearray, &QByteArray::split, ',');
4  ...
5  QList<QByteArray> result = future.result();

调用非成员函数：

1  // call 'void QImage::invertPixels(InvertMode mode)' in a separate thread
2  QImage image = ...;
3  QFuture<void> future = QtConcurrent::run(&image, &QImage::invertPixels, QImage::InvertRgba);
4  ...
5  future.waitForFinished();
6  // At this point, the pixels in 'image' have been inverted