Release/moc_Controller.cpp:-1: error: undefined reference to `Controller::handleResults(QString const&)'

micha_eleric

using code from https://doc.qt.io/qt-5/qthread.html, changed a few names, and split into .h and .cpp files, I get a moc file error.

.h file:

#ifndef CThreadCONTROLLER_H
#define CThreadCONTROLLER_H

#include <QObject>
#include <QThread>

class CThreadController : public QObject
{
    Q_OBJECT
    QThread guiThread;
public:
    // constructor
    CThreadController();
    // destructor
    ~CThreadController();

public slots:
    void handleResults(const QString &);

signals:
    void operate(const QString &);

};

#endif // CThreadCONTROLLER_H

.cpp file:

#include "CThreadController.h"
#include "CGUI.h"

CThreadController::CThreadController() : QObject()
{
    CNC::CGUI *gui = new CNC::CGUI;
    gui->moveToThread(&guiThread);
    connect(&guiThread, &QThread::finished, gui, &QObject::deleteLater);
    //connect(this, &CThreadController::operate, gui, &CNC::CGUI::doWork);
    //connect(gui, &CNC::CGUI::resultReady, this, &CThreadController::handleResults);
    guiThread.start();
}

CThreadController::~CThreadController()
{
    guiThread.quit();
    guiThread.wait();
}


/*
Worker *worker = new Worker;
worker->moveToThread(&workerThread);
connect(&workerThread, &QThread::finished, worker, &QObject::deleteLater);
connect(this, &Controller::operate, worker, &Worker::doWork);
connect(worker, &Worker::resultReady, this, &Controller::handleResults);
workerThread.start();

workerThread = guiThread
*worker = *gui
Worker = CNC::CGUI
&Controller = &CThreadController
*/

errors:
:-1: error: moc_CThreadController.o: in function `CThreadController::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)':

/home/michaeleric/build-GUI-Desktop-Release/moc_CThreadController.cpp:-1: error: undefined reference to `CThreadController::handleResults(QString const&)'

:-1: error: collect2: error: ld returned 1 exit status

i dont understand error. handleResults(QString const&) is unused on website code, nor in my code. only class name changed.
what is the error, and how to fix it.

micha_eleric

void CThreadController::handleResults(const QString &){}

was not in .cpp file