‘CGUI::CGUI(const CGUI&)’ is implicitly deleted because the default definition would be ill-formed:

[micha_eleric]

../src/Main.cpp: In function ‘int main(int, char**)’:
../src/Main.cpp:15:20: error: use of deleted function ‘CGUI::CGUI(const CGUI&)’
15 | CGUI myapp = CGUI();
| ^
In file included from ../src/Main.cpp:9:
../src/CGUI.h:25:7: note: ‘CGUI::CGUI(const CGUI&)’ is implicitly deleted because the default definition would be ill-formed:
25 | class CGUI : public QMainWindow
| ^~~~
../src/CGUI.h:25:7: error: ‘QMainWindow::QMainWindow(const QMainWindow&)’ is private within this context

it fails because it was compiler deleted. why?

main.cpp

#include "CGUI.h"

int main(int argc, char **argv)
{
	std::cout << "__name__";
	QApplication app (argc, argv);
	CGUI myapp = CGUI();
	myapp.show();
	return app.exec();
}

CGUI.h

#ifndef CGUI_H_
#define CGUI_H_

#include <QMainWindow>
#include <QSerialPort>
#include <string>
#include <cstring>
#include <iostream>
#include <fstream>
#include <cmath>
#include <thread>
#include <unistd.h>
#include <sstream>
#include <QtGui>
#include <QApplication>
#include <functional>

class CGUI : public QMainWindow
{
public:
	CGUI(QWidget *parent = 0);
	virtual ~CGUI();
};

#endif /* CGUI_H_ */

CGUI.cpp

CGUI::CGUI(QWidget *parent): QMainWindow(parent)
{
	// TODO Auto-generated constructor stub
}

CGUI::~CGUI()
{
	// TODO Auto-generated destructor stub
}

ok. stripped down basic

i did not add "Q_OBJECT", which i was told to add, then told not to add.
using linux, eclipse

[jsulm]

@micha_eleric said in ‘CGUI::CGUI(const CGUI&)’ is implicitly deleted because the default definition would be ill-formed::

CGUI myapp = CGUI();

This should be simply

CGUI myapp;

With your current code you're creating a CGUI (with CGUI()) and assign it to another one. This means the first one is copied and QObjects cannot be copied.

[micha_eleric]

@jsulm ty, that explains other people stating QObjects cannot be copied