main.cpp

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// ======================================================================
//  main.cpp
// ======================================================================
//                   This file is a part of the book 
//             "Qt 5.10 Professional programming with C++"
//                       http://qt-book.com
// ======================================================================
//  Copyright (c) 2017 by Max Schlee
// ======================================================================

#include <QtWidgets>
#include "Counter.h"

// ----------------------------------------------------------------------
int main (int argc, char** argv)
{
    QApplication app(argc, argv);

    QLabel      lbl("0");
    QPushButton cmd("ADD");
    Counter     counter;

    lbl.show();
    cmd.show();

    QObject::connect(&cmd, SIGNAL(clicked()), 
                     &counter, SLOT(slotInc())
                    );

    QObject::connect(&counter, SIGNAL(counterChanged(int)),
                     &lbl, SLOT(setNum(int))
                    );

    QObject::connect(&counter, SIGNAL(goodbye()), 
                     &app, SLOT(quit())
                    );

    return app.exec();
}