undefined reference to 'vtable for Firs/SecondClass'

Staslend

I see the others topics about this problem but can't find something what can help me. I create the console aplication and try to compile but have this error. This is code :

#include <QCoreApplication>
#include <iostream>

using namespace std;


class FirstClass : public QObject{  //first class         (in this line error)
    Q_OBJECT
private:
    int x;                        
public:
    virtual ~FirstClass() {};      //the guy from stackoverflov say that this is can help  (in this line error)
public slots:
    void change(){    //add 1 to x and if x = 4 write message to console 
        x++;

        if (x == 4) emit xEqu4();
    }
signals:
    void xEqu4();       
};

class SecondClass : public QObject{  //second class   (in this line error)
  Q_OBJECT
public:
    virtual ~SecondClass() {}    //(in this line error)
    void Work(){                  
        char c;
        for (int x = 0; x < 6 ; x++){           //you write 'g' and after 4 'g' will be the message 
        cout << "Write 'g' please" << endl;
        cin >> c;
        if (c == 'g') emit ch();//(in this line error)
        }
    }
public slots:
    void goodbye(){
        cout << "Goodbye!!!" << endl;  //this is message
    }
signals:
    void ch();
};

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    FirstClass f;
    SecondClass s;

    QObject::connect(&s, SIGNAL(ch()),
                     &f, SLOT(change()));
    QObject::connect(&f, SIGNAL(xEqu4()),
                     &s, SLOT(goodbye()));

    s.Work();

    return a.exec();
}

And a .pro file if you need it, i didn`t toch it:

QT -= gui

CONFIG += c++11 console
CONFIG -= app_bundle


# The following define makes your compiler emit warnings if you use
# any feature of Qt which as been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
        main.cpp

How to solwe this problem?

VRonin

You can't have multiple Q_OBJECT macros in the same file, moc can't handle it. move the two classes in separate header files