QButtonGroup signals

[SPlatten]

I have derived a class from QButtonGroup, the prototype:

    class clsQtButtonGrp : public QButtonGroup {
    Q_OBJECT
        friend class clsXMLnode;

    private:
        static mpSignals mscmpSignals;
        clsXMLnode* mpobjNode;

    public:
        static const char mscszQtSignalClicked[];
        static const char mscszQtSignalPressed[];
        static const char mscszQtSignalReleased[];
        static const char mscszQtSignalToggled[];

        explicit clsQtButtonGrp(clsXMLnode* pobjNode, QWidget* parent = nullptr);
        static bool blnValidSignal(QString strSignal);
        QMetaObject::Connection connect(clsSignal* pobjSignal
                                       ,clsXMLnode* pobjSubscriber
                                       ,QJSEngine* pobjScriptEng = nullptr
                                       ,QString strScript = "");
        static mpSignals* pmpGetSignals() { return &clsQtButtonGrp::mscmpSignals; }

    private slots:
        void rptrClicked(QAbstractButton* pobjButton);
        void rptrPressed(QAbstractButton* pobjButton);
        void rptrReleased(QAbstractButton* pobjButton);
        void rptrToggled(QAbstractButton* pobjButton, bool blnChecked);
        void setupControl(const QJsonObject& crobjJSON);

    signals:

    public slots:        
    };

In my constructor I connect the signals to the repeater slots in the class, however QObject::connect is underlined in red.

    QMetaObject::Connection cn;
    cn = QObject::connect(this, &clsQtButtonGrp::buttonClicked
                         ,this, &clsQtButtonGrp::rptrClicked);
    Q_ASSERT_X(cn, scszQtButtonGrp
              ,scstrAssert.arg(clsQtButtonGrp::mscszQtSignalClicked)
                          .toLatin1().data());

Why?

Just one of 22 errors:

/Users/sy/XMLMPAM/clsQtButtonGrp.cpp:46: error: no matching member function for call to 'connect'
../clsQtButtonGrp.cpp:46:19: error: no matching member function for call to 'connect'
    cn = QObject::connect(this, &clsQtButtonGrp::buttonPressed
         ~~~~~~~~~^~~~~~~
../../Qt/5.15.2/clang_64/lib/QtCore.framework/Headers/qobject.h:222:36: note: candidate function not viable: no overload of 'buttonPressed' matching 'const char *' for 2nd argument
    static QMetaObject::Connection connect(const QObject *sender, const char *signal,
                                   ^
../../Qt/5.15.2/clang_64/lib/QtCore.framework/Headers/qobject.h:225:36: note: candidate function not viable: no overload of 'buttonPressed' matching 'const QMetaMethod' for 2nd argument
    static QMetaObject::Connection connect(const QObject *sender, const QMetaMethod &signal,
                                   ^
../../Qt/5.15.2/clang_64/lib/QtCore.framework/Headers/qobject.h:481:41: note: candidate function not viable: no overload of 'buttonPressed' matching 'const char *' for 2nd argument
inline QMetaObject::Connection QObject::connect(const QObject *asender, const char *asignal,
                                        ^
../../Qt/5.15.2/clang_64/lib/QtCore.framework/Headers/qobject.h:242:43: note: candidate template ignored: couldn't infer template argument 'Func1'
    static inline QMetaObject::Connection connect(const typename QtPrivate::FunctionPointer<Func1>::Object *sender, Func1 signal,
                                          ^
../../Qt/5.15.2/clang_64/lib/QtCore.framework/Headers/qobject.h:283:13: note: candidate template ignored: couldn't infer template argument 'Func1'
            connect(const typename QtPrivate::FunctionPointer<Func1>::Object *sender, Func1 signal, const QObject *context, Func2 slot,
            ^
../../Qt/5.15.2/clang_64/lib/QtCore.framework/Headers/qobject.h:322:13: note: candidate template ignored: couldn't infer template argument 'Func1'
            connect(const typename QtPrivate::FunctionPointer<Func1>::Object *sender, Func1 signal, const QObject *context, Func2 slot,
            ^
../../Qt/5.15.2/clang_64/lib/QtCore.framework/Headers/qobject.h:274:13: note: candidate function template not viable: requires 3 arguments, but 4 were provided
            connect(const typename QtPrivate::FunctionPointer<Func1>::Object *sender, Func1 signal, Func2 slot)
            ^
../../Qt/5.15.2/clang_64/lib/QtCore.framework/Headers/qobject.h:314:13: note: candidate function template not viable: requires 3 arguments, but 4 were provided
            connect(const typename QtPrivate::FunctionPointer<Func1>::Object *sender, Func1 signal, Func2 slot)
            ^

[jsulm]

@SPlatten Yes, it looks like void buttonClicked(int); isn't mentioned in the documentation. I was also wondering why one would need to specify which overload to use if there is only one :-)
So, I checked the code: https://code.woboq.org/qt5/qtbase/src/widgets/widgets/qbuttongroup.h.html

You can file a bug for documentation if you like.

[jsulm]

@SPlatten said in QButtonGroup signals:

however QObject::connect is underlined in red

And what does the error message say?

[SPlatten]

@jsulm sorry, please see edited post.

[jsulm]

@SPlatten buttonClicked is overloaded.
It is shown in the documentation how to connect it: https://doc.qt.io/qt-5/qbuttongroup.html#buttonClicked

[SPlatten]

@jsulm said in QButtonGroup signals:

https://doc.qt.io/qt-5/qbuttongroup.html#buttonClicked

Thank you, ok that makes a lot of sense, however the documentation:
https://doc.qt.io/qt-5/qbuttongroup.html#signals

Clicking on Signals on the left:
https://doc.qt.io/qt-5/qbuttongroup.html#signals

It isn't clear at all that there are multiple (overloaded) versions of the signal.

[jsulm]

@SPlatten Yes, it looks like void buttonClicked(int); isn't mentioned in the documentation. I was also wondering why one would need to specify which overload to use if there is only one :-)
So, I checked the code: https://code.woboq.org/qt5/qtbase/src/widgets/widgets/qbuttongroup.h.html

You can file a bug for documentation if you like.

[SPlatten]

@jsulm , will do.

[SPlatten]

@jsulm said in QButtonGroup signals:

https://code.woboq.org/qt5/qtbase/src/widgets/widgets/qbuttongroup.h.html

https://bugreports.qt.io/browse/QTCREATORBUG-26552

[J.Hilk]

@SPlatten to be fair,
its is mentioned
https://doc.qt.io/qt-5/qbuttongroup.html#buttonClicked

[SPlatten]

@J-Hilk , yes, if you know where to look but it isn't very clear on the signals page, unless you scroll down.