Signal and slot arguments are not compatible

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The signals and slots mechanism is type safe: The signature of a signal must match the signature of the receiving slot. (In fact a slot may have a shorter signature than the signal it receives because it can ignore extra arguments.) Since the signatures are compatible, the compiler can help us detect type...

The code (or component) that emits the signal does not know or care if the signal is being used. The signal/slot mechanism has the following features. A signal may be connected to many slots. A signal may also be connected to another signal. Signal arguments may be any Python type. A slot may be connected to many signals. Copied or Not Copied: Arguments in Signal-Slot Connections? The conclusion from the above results is that we should pass arguments to signals and slots by const reference and not by value. This advice is true for both direct and queued connections. Even if the sender of the signal and the receiver of the slot are in different threads, we should still pass arguments by const reference. How Qt Signals and Slots Work - Woboq

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Qt 4.5: Signals and Slots The signals and slots mechanism is type safe: The signature of a signal must match the signature of the receiving slot. (In fact a slot may have a shorter signature than the signal it receives because it can ignore extra arguments.) Since the signatures are compatible, the compiler can help us detect type...

What do I do if a slot is not invoked? - KDAB

Therefore it is not usually necessary to use QtCore.SLOT() for Qt slots. However, doing so is more efficient as it avoids a conversion to Python and back to C++. Qt allows a signal to be connected to a slot that requires fewer arguments than the signal passes. The extra arguments are quietly discarded. PyQt4 slots can be used in the same way. New-style Signal and Slot Support — PyQt 4.11.4 Reference ...

Qt C++: static assertion failed: Signal and slot …

The code (or component) that emits the signal does not know or care if the signal is ... When a signal is emitted then any arguments are converted to C++ types if ... Using C++11 Lambdas As Qt Slots – asmaloney.com Mar 13, 2016 ... 2000) where signals are named signalFoo() and slots are named ... can be useful for things like this slot mechanism where the code may not be ... It also takes optional parameters which is how we'll pass signal parameters to ...

Copied or Not Copied: Arguments in Signal-Slot Connections?

"Signal and slot arguments are not compatible" - says that the signatures of signal and slot do not match. Be aware that QVector is not the same as QVector . Navigation. Qt Forum. ... Emit QVector singal with a structure Emit QVector singal with a structure. This topic has been deleted. Only users with topic management privileges can see it. What do I do if a slot is not invoked? - KDAB The signal/slot argument lists is not compatible (*) The elements marked with a (*) do not fully apply to the new connection syntax, which performs checks at compile-time. When QObject::connect() fails it returns false and it emits a warning which gets typically printed on the console,...