Contents

QXmppPromise Class

template <typename T> class QXmppPromise

Create and update QXmppTask objects to communicate results of asynchronous operations. More...

Header: #include <QXmppTask.h>
Since: QXmpp 1.5

Public Functions

QXmppPromise(QXmppPromise<T> &&p)
(since QXmpp 1.15) bool cancelled() const
void finish()
void finish(U &&value)
QXmppTask<T> task()
QXmppPromise<T> &operator=(QXmppPromise<T> &&p)

Detailed Description

Unlike QFuture, this is not thread-safe. This avoids the need to do mutex locking at every access though.

Member Function Documentation

QXmppPromise::QXmppPromise(QXmppPromise<T> &&p)

Move constructor.

[since QXmpp 1.15] bool QXmppPromise::cancelled() const

Returns whether the task has been cancelled.

If a task is cancelled, no call to finish() is needed and no continuation is resumed.

This function was introduced in QXmpp 1.15.

void QXmppPromise::finish() requires (std::is_void_v<T>)

Finishes task.

Must be called only once.

template <typename U> void QXmppPromise::finish(U &&value) requires (!std::is_void_v<T>)

Finishes task with result.

Must be called only once.

QXmppTask<T> QXmppPromise::task()

Obtain a handle to this promise that allows to obtain the value that will be produced asynchronously.

QXmppPromise<T> &QXmppPromise::operator=(QXmppPromise<T> &&p)

Move assignment operator, moving from p.