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Qt slot function return value

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What you are seeing is undefined behaviour. Signals are not designed to give you the slots' return values, and there is no guarantee that your example will behave the same way in future versions of Qt. Make sure your code never tries to get the return value of a slot through a signal.

Disconnecting in Qt 5. As you might expect, there are some changes in how connections can be terminated in Qt 5, too. You can disconnect in the old way (using SIGNAL, SLOT) but only if. You connected using the old way, or. If you want to disconnect all the slots from a given signal using wild card character. PyQt/Sending Python values with signals and slots - Python ... Sending Python values with signals and slots. On the #pyqt channel on Freenode, Khertan asked about sending Python values via Qt's signals and slots mechanism. The following example uses the PyQt_PyObject value declaration with an old-style signal-slot connection, and again when the signal is emitted, to communicate a Python dictionary. Qt: meaning of slot return value? - Stack Overflow

An abstract view of some signals and slots connections In Qt we have an alternative to the callback technique. We use signals and slots. A signal is emitted when a particular event occurs. Qt's widgets have many pre-defined signals, but we can always subclass to add our own. A slot is a function that is called in reponse to a particular signal.

VTK: vtkEventQtSlotConnect Class Reference ... Class Reference. Manage connections between VTK events and Qt slots. ... Return 1 if this class is the same type of (or a subclass of) the named class. More.

rviz: rviz::Property Class Reference - Size

On windowing systems that do not make this information visible to the application, isExposed() will simply return the same value as isVisible().

Qt 5 and C++11: Lambdas Are Your Friend | Custom Software ...

VTK: vtkEventQtSlotConnect Class Reference ... Class Reference. Manage connections between VTK events and Qt slots. ... Return 1 if this class is the same type of (or a subclass of) the named class. More. PySide/PyQt Tutorial: Creating Your Own Signals and Slots - Python ...

How to Expose a Qt C++ Class with Signals and Slots to QML - Felgo

Qt - Singleshot Timer with Lambda function as slot | qt… If a singleshot timer is required, it is quiet handy to have the slot as lambda function right in the place where the timer is declaredIn earlier Qt5 versions it has to be done with more boiler plate code: QTimer *timer = new QTimer(this); timer->setSingleShot(true) Кто послал сигнал в слот? | C++ (Qt) Кто послал сигнал в слот? - русский QT форум.Тролли пишут что данный путь нарушает "сигнал-слотовую-парадигму" . Кроме того, ссылка возвращаемая функцией будет "не валидна" в случае соединения объектов в разных потоках - смотрите Assistant. c++ signal - Qt:meaning of slot return value? - CODE…