[QTBUG-58054] Impossible to connect signal to noexcept pmf ... when trying to connect a signal to a noexcept pmf, the following static_assert triggers: Signals & Slots | Qt Core 5.12.3 Signals And Slots With Default Arguments. The rule about whether to include arguments or not in the SIGNAL () and SLOT () macros, if the arguments have default values, is that the signature passed to the SIGNAL () macro must not have fewer arguments than the signature passed to the SLOT () macro. #include <QApplication> #include <QMainWindow> #include ... QObject::connect(rbtn_0, &QRadioButton::clicked, this, SLOT(rbtn_toggle(bool))); }
17 Dec 2012 ... There are three new static overloads of QObject::connect : (not actual code) .... SlotType ; //compilation error if the arguments does not match. ... SlotType:: Arguments>::value), "Signal and slot arguments are not compatible.
Static Assertion - cppreference.com Note. Since message has to be a string literal, it cannot contain dynamic information or even a constant expression that is not a string literal itself. In particular, it cannot contain the name of the template type argument. [] Defect reportThe following behavior-changing defect reports were applied retroactively to previously published C++ standards. How Qt Signals and Slots Work - Part 2 - Qt5 New Syntax This is the sequel of my previous article explaining the implementation details of the signals and slots. In the Part 1, we have seen the general principle and how it works with the old syntax.In this blog post, we will see the implementation details behind the new function pointer based syntax in Qt5.
COMP: Qt5: Fix error: static assertion failed: Old plugin ...
@JuhaSim said in Qt slot with default arguments not working: Is this a bug? no, default arguments for slots is a feature for Qt4 Syntax only, the Qt5 one does not support it, sadly enough. [QTBUG-58054] Impossible to connect signal to noexcept pmf - Qt …
and the signal (valueChanged) arguments was different from the slot (updateValue) arguments, this will make the compiler to try implicit conversion of the signal and slot arguments and you have one of 2 possibilities:
Signals & Slots | Qt Core 5.12.3 Qt's signals and slots mechanism ensures that if you connect a signal to a slot, the slot will be called with the signal's parameters at the right time. Signals and slots can take any number of arguments of any type. They are completely type safe.
Static Assertion - C < c The _Static_assert is a keyword added in the C11 standard version of the C Programming Language that provides a compile-time assertions mechanism to the language.
Qt slot with default arguments not working | Qt Forum @JuhaSim said in Qt slot with default arguments not working:. Is this a bug? no, default arguments for slots is a feature for Qt4 Syntax only, the Qt5 one does not support it, sadly enough. Qt: Cannot queue arguments of type MyClass - Stack Overflow
and the signal (valueChanged) arguments was different from the slot (updateValue) arguments, this will make the compiler to try implicit conversion of the signal and slot arguments and you have one of 2 possibilities: 1. The compiler will try to make auto conversion (implicit conversion) and the conversion succeeded. 2. QT5 Radio button signal not compatible with function, even ...