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#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

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