QFutureSynchronizer Class

template <typename T> class QFutureSynchronizer

The QFutureSynchronizer class is a convenience class that simplifies QFuture synchronization. 更多...

頭：	#include <QFutureSynchronizer>
qmake:	QT += core
Since:	Qt 4.4

該類在 Qt 4.4 引入。

所有成員列錶，包括繼承成員

公共函數

	QFutureSynchronizer (const QFuture<T> & future )
	QFutureSynchronizer ()
	~QFutureSynchronizer ()
void	addFuture (const QFuture<T> & future )
bool	cancelOnWait () const
void	clearFutures ()
QList<QFuture<T>>	futures () const
void	setCancelOnWait (bool enabled )
void	setFuture (const QFuture<T> & future )
void	waitForFinished ()

詳細描述

QFutureSynchronizer is a template class that simplifies synchronization of one or more QFuture objects. Futures are added using the addFuture () 或 setFuture () 函數。 futures () function returns a list of futures. Use clearFutures () to remove all futures from the QFutureSynchronizer.

The waitForFinished () function waits for all futures to finish. The destructor of QFutureSynchronizer calls waitForFinished (), providing an easy way to ensure that all futures have finished before returning from a function:

void someFunction()
{
    QFutureSynchronizer<void> synchronizer;
    ...
    synchronizer.addFuture(QtConcurrent::run(anotherFunction));
    synchronizer.addFuture(QtConcurrent::map(list, mapFunction));
    return; // QFutureSynchronizer waits for all futures to finish
}

行為在 waitForFinished () can be changed using the setCancelOnWait () function. Calling setCancelOnWait (true) will cause waitForFinished () to cancel all futures before waiting for them to finish. You can query the status of the cancel-on-wait feature using the cancelOnWait () 函數。

另請參閱 QFuture , QFutureWatcher ，和 Qt Concurrent .

成員函數文檔編製

QFutureSynchronizer:: QFutureSynchronizer (const QFuture < T > & future )

Constructs a QFutureSynchronizer and begins watching future 通過調用 addFuture ().

另請參閱 addFuture ().

QFutureSynchronizer:: QFutureSynchronizer ()

Constructs a QFutureSynchronizer.

QFutureSynchronizer:: ~QFutureSynchronizer ()

調用 waitForFinished () function to ensure that all futures have finished before destroying this QFutureSynchronizer .

另請參閱 waitForFinished ().

void QFutureSynchronizer:: addFuture (const QFuture < T > & future )

添加 future to the list of managed futures.

另請參閱 futures ().

bool QFutureSynchronizer:: cancelOnWait () const

返迴 true if the cancel-on-wait feature is enabled; otherwise returns false. If cancel-on-wait is enabled, the waitForFinished () function will cancel all futures before waiting for them to finish.

另請參閱 setCancelOnWait () 和 waitForFinished ().

void QFutureSynchronizer:: clearFutures ()

Removes all managed futures from this QFutureSynchronizer .

另請參閱 addFuture () 和 setFuture ().

QList < QFuture < T >> QFutureSynchronizer:: futures () const

Returns a list of all managed futures.

另請參閱 addFuture () 和 setFuture ().

void QFutureSynchronizer:: setCancelOnWait ( bool enabled )

Enables or disables the cancel-on-wait feature based on the enabled argument. If enabled 為 true， waitForFinished () function will cancel all futures before waiting for them to finish.

另請參閱 cancelOnWait () 和 waitForFinished ().

void QFutureSynchronizer:: setFuture (const QFuture < T > & future )

設置 future to be the only future managed by this QFutureSynchronizer . This is a convenience function that calls waitForFinished ()，然後 clearFutures (), and finally passes future to addFuture ().

另請參閱 addFuture (), waitForFinished ()，和 clearFutures ().

void QFutureSynchronizer:: waitForFinished ()

Waits for all futures to finish. If cancelOnWait () 返迴 true , each future is canceled before waiting for them to finish.

另請參閱 cancelOnWait () 和 setCancelOnWait ().