Moc compilation error

[Ylvy]

Why when i modify
void setText(const QString& text)
to
void setText(const QString& text, QString text_2)

It doesnt compile anymore? getting this error:

1>Build FAILED.
1>
1>x64\Debug\moc\moc_test.cpp(168,19): error C2660: 'Test::setText': function does not take 1 arguments

class Test : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QString text READ text WRITE setText NOTIFY textChanged)

public:
    QString text() { return ""; }

public slots:
    void setText(const QString& text, const QString& text_2) 
    {
    }
signals:
    void textChanged(const QString& text);
};

[JoeCFD]

@Ylvy make clean or make distclean with pro file.
Rebuild your project.

[Ylvy]

@JoeCFD Already tried it multiple times.

Commenting: Q_PROPERTY(QString text READ text WRITE setText NOTIFY textChanged)
It does compile, when the function expect more than one argument i need to modify something in the Q_PROPERTY WRITE setText?

/****************************************************************************
** Meta object code from reading C++ file 'test.h'
**
** Created by: The Qt Meta Object Compiler version 68 (Qt 6.5.0)
**
** WARNING! All changes made in this file will be lost!
*****************************************************************************/

#include "stdafx.h"
#include "../../../test.h"
#include <QtGui/qtextcursor.h>
#include <QScreen>
#include <QtCore/qmetatype.h>

#if __has_include(<QtCore/qtmochelpers.h>)
#include <QtCore/qtmochelpers.h>
#else
QT_BEGIN_MOC_NAMESPACE
#endif


#include <memory>

#if !defined(Q_MOC_OUTPUT_REVISION)
#error "The header file 'test.h' doesn't include <QObject>."
#elif Q_MOC_OUTPUT_REVISION != 68
#error "This file was generated using the moc from 6.5.0. It"
#error "cannot be used with the include files from this version of Qt."
#error "(The moc has changed too much.)"
#endif

#ifndef Q_CONSTINIT
#define Q_CONSTINIT
#endif

QT_WARNING_PUSH
QT_WARNING_DISABLE_DEPRECATED
QT_WARNING_DISABLE_GCC("-Wuseless-cast")
namespace {

#ifdef QT_MOC_HAS_STRINGDATA
struct qt_meta_stringdata_CLASSTestENDCLASS_t {};
static constexpr auto qt_meta_stringdata_CLASSTestENDCLASS = QtMocHelpers::stringData(
    "Test",
    "textChanged",
    "",
    "text",
    "setText",
    "text_2"
);
#else  // !QT_MOC_HAS_STRING_DATA
struct qt_meta_stringdata_CLASSTestENDCLASS_t {
    uint offsetsAndSizes[12];
    char stringdata0[5];
    char stringdata1[12];
    char stringdata2[1];
    char stringdata3[5];
    char stringdata4[8];
    char stringdata5[7];
};
#define QT_MOC_LITERAL(ofs, len) \
    uint(sizeof(qt_meta_stringdata_CLASSTestENDCLASS_t::offsetsAndSizes) + ofs), len 
Q_CONSTINIT static const qt_meta_stringdata_CLASSTestENDCLASS_t qt_meta_stringdata_CLASSTestENDCLASS = {
    {
        QT_MOC_LITERAL(0, 4),  // "Test"
        QT_MOC_LITERAL(5, 11),  // "textChanged"
        QT_MOC_LITERAL(17, 0),  // ""
        QT_MOC_LITERAL(18, 4),  // "text"
        QT_MOC_LITERAL(23, 7),  // "setText"
        QT_MOC_LITERAL(31, 6)   // "text_2"
    },
    "Test",
    "textChanged",
    "",
    "text",
    "setText",
    "text_2"
};
#undef QT_MOC_LITERAL
#endif // !QT_MOC_HAS_STRING_DATA
} // unnamed namespace

Q_CONSTINIT static const uint qt_meta_data_CLASSTestENDCLASS[] = {

 // content:
      11,       // revision
       0,       // classname
       0,    0, // classinfo
       2,   14, // methods
       1,   34, // properties
       0,    0, // enums/sets
       0,    0, // constructors
       0,       // flags
       1,       // signalCount

 // signals: name, argc, parameters, tag, flags, initial metatype offsets
       1,    1,   26,    2, 0x06,    2 /* Public */,

 // slots: name, argc, parameters, tag, flags, initial metatype offsets
       4,    2,   29,    2, 0x0a,    4 /* Public */,

 // signals: parameters
    QMetaType::Void, QMetaType::QString,    3,

 // slots: parameters
    QMetaType::Void, QMetaType::QString, QMetaType::QString,    3,    5,

 // properties: name, type, flags
       3, QMetaType::QString, 0x00015103, uint(0), 0,

       0        // eod
};

Q_CONSTINIT const QMetaObject Test::staticMetaObject = { {
    QMetaObject::SuperData::link<QObject::staticMetaObject>(),
    qt_meta_stringdata_CLASSTestENDCLASS.offsetsAndSizes,
    qt_meta_data_CLASSTestENDCLASS,
    qt_static_metacall,
    nullptr,
    qt_incomplete_metaTypeArray<qt_meta_stringdata_CLASSTestENDCLASS_t,
        // property 'text'
        QtPrivate::TypeAndForceComplete<QString, std::true_type>,
        // Q_OBJECT / Q_GADGET
        QtPrivate::TypeAndForceComplete<Test, std::true_type>,
        // method 'textChanged'
        QtPrivate::TypeAndForceComplete<void, std::false_type>,
        QtPrivate::TypeAndForceComplete<const QString &, std::false_type>,
        // method 'setText'
        QtPrivate::TypeAndForceComplete<void, std::false_type>,
        QtPrivate::TypeAndForceComplete<const QString &, std::false_type>,
        QtPrivate::TypeAndForceComplete<const QString &, std::false_type>
    >,
    nullptr
} };

void Test::qt_static_metacall(QObject *_o, QMetaObject::Call _c, int _id, void **_a)
{
    if (_c == QMetaObject::InvokeMetaMethod) {
        auto *_t = static_cast<Test *>(_o);
        (void)_t;
        switch (_id) {
        case 0: _t->textChanged((*reinterpret_cast< std::add_pointer_t<QString>>(_a[1]))); break;
        case 1: _t->setText((*reinterpret_cast< std::add_pointer_t<QString>>(_a[1])),(*reinterpret_cast< std::add_pointer_t<QString>>(_a[2]))); break;
        default: ;
        }
    } else if (_c == QMetaObject::IndexOfMethod) {
        int *result = reinterpret_cast<int *>(_a[0]);
        {
            using _t = void (Test::*)(const QString & );
            if (_t _q_method = &Test::textChanged; *reinterpret_cast<_t *>(_a[1]) == _q_method) {
                *result = 0;
                return;
            }
        }
    }else if (_c == QMetaObject::ReadProperty) {
        auto *_t = static_cast<Test *>(_o);
        (void)_t;
        void *_v = _a[0];
        switch (_id) {
        case 0: *reinterpret_cast< QString*>(_v) = _t->text(); break;
        default: break;
        }
    } else if (_c == QMetaObject::WriteProperty) {
        auto *_t = static_cast<Test *>(_o);
        (void)_t;
        void *_v = _a[0];
        switch (_id) {
        case 0: _t->setText(*reinterpret_cast< QString*>(_v)); break;
        default: break;
        }
    } else if (_c == QMetaObject::ResetProperty) {
    } else if (_c == QMetaObject::BindableProperty) {
    }
}

const QMetaObject *Test::metaObject() const
{
    return QObject::d_ptr->metaObject ? QObject::d_ptr->dynamicMetaObject() : &staticMetaObject;
}

void *Test::qt_metacast(const char *_clname)
{
    if (!_clname) return nullptr;
    if (!strcmp(_clname, qt_meta_stringdata_CLASSTestENDCLASS.stringdata0))
        return static_cast<void*>(this);
    return QObject::qt_metacast(_clname);
}

int Test::qt_metacall(QMetaObject::Call _c, int _id, void **_a)
{
    _id = QObject::qt_metacall(_c, _id, _a);
    if (_id < 0)
        return _id;
    if (_c == QMetaObject::InvokeMetaMethod) {
        if (_id < 2)
            qt_static_metacall(this, _c, _id, _a);
        _id -= 2;
    } else if (_c == QMetaObject::RegisterMethodArgumentMetaType) {
        if (_id < 2)
            *reinterpret_cast<QMetaType *>(_a[0]) = QMetaType();
        _id -= 2;
    }else if (_c == QMetaObject::ReadProperty || _c == QMetaObject::WriteProperty
            || _c == QMetaObject::ResetProperty || _c == QMetaObject::BindableProperty
            || _c == QMetaObject::RegisterPropertyMetaType) {
        qt_static_metacall(this, _c, _id, _a);
        _id -= 1;
    }
    return _id;
}

// SIGNAL 0
void Test::textChanged(const QString & _t1)
{
    void *_a[] = { nullptr, const_cast<void*>(reinterpret_cast<const void*>(std::addressof(_t1))) };
    QMetaObject::activate(this, &staticMetaObject, 0, _a);
}
QT_WARNING_POP

The error is at this line case 0: _t->setText(*reinterpret_cast< QString*>(_v)); break;
is this a bug from the auto-generated moc file?

[JoeCFD]

@Ylvy I thought about that as well. setText Q_PROPERTY(QString text READ text WRITE setText NOTIFY textChanged) needs one argument. You can define two funcs

public slots:
    void setText(const QString& text, const QString& text_2) 
    {
    }   

    void setText(const QString& text ) 
     {
     }

[JonB]

@Ylvy
For a QPROPERTY WRITE you cannot use your method. https://doc.qt.io/qt-6/properties.html

A WRITE accessor function is optional. It is for setting the property value. It must return void and must take exactly one argument, either of the property's type or a pointer or reference to that type

[Ylvy]

@JonB And when you need more than one argument?

[Christian Ehrlicher]

@Ylvy said in Moc compilation error:

And when you need more than one argument?

A property does need exactly one element as written in the documentation - otherwise it's not a property. So either don't define it as property or only pass one argument.