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Issue #77 Move singleShot from worker.h to threadutils.h

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This commit is contained in:
Mat Sutcliffe
2020-08-27 00:45:13 +01:00
parent bb8aeaa3d0
commit 9e0ebef5a1
3 changed files with 30 additions and 24 deletions
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23
src/blackmisc/worker.h
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@@ -42,29 +42,6 @@
namespace BlackMisc
{
/*!
* Starts a single-shot timer which will call a task in the thread of the given object when it times out.
*
* Differs from QTimer::singleShot in that this implementation interacts better with QObject::moveToThread,
* and returns a QFuture which can be used to detect when the task has finished or obtain its return value.
*/
template <typename F>
auto singleShot(int msec, QObject *target, F &&task)
{
CPromise<decltype(task())> promise;
QSharedPointer<QTimer> timer(new QTimer, [](QObject * o) { QMetaObject::invokeMethod(o, &QObject::deleteLater); });
timer->setSingleShot(true);
timer->moveToThread(target->thread());
QObject::connect(timer.data(), &QTimer::timeout, target, [trace = getStackTrace(), task = std::forward<F>(task), timer, promise]() mutable
{
static_cast<void>(trace);
timer.clear();
promise.setResultFrom(task);
});
QMetaObject::invokeMethod(timer.data(), [t = timer.data(), msec] { t->start(msec); });
return promise.future();
}
/*!
* Just a subclass of QThread whose destructor waits for the thread to finish.
*/