signalsandslots.h

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
#ifndef SIGNALSANDSLOTS_H
#define SIGNALSANDSLOTS_H
 
#define Counter PlainCounter
 
//! [0]
class Counter
{
public:
    Counter() { m_value = 0; }
 
    int value() const { return m_value; }
    void setValue(int value);
 
private:
    int m_value;
};
//! [0]
 
#undef Counter
#define Counter ObjectCounter
 
//! [1]
#include <QObject>
//! [1]
 
//! [2]
class Counter : public QObject
//! [2] //! [3]
{
    Q_OBJECT
 
// Note. The Q_OBJECT macro starts a private section.
// To declare public members, use the 'public:' access modifier.
public:
    Counter() { m_value = 0; }
 
    int value() const { return m_value; }
 
public slots:
    void setValue(int value);
 
signals:
    void valueChanged(int newValue);
 
private:
    int m_value;
};
//! [3]
 
#endif