Abominable helper for defining Qt properties.

propertyhelper.h

#ifndef PROPERTYHELPER_H
#define PROPERTYHELPER_H

#define PROPERTY_HELPER(type,name,getter,setter,signal) \
public: \
    type getter() const { return p_##name; } \
    void setter(type value) { \
        if (p_##name == value) return; \
        p_##name = value; \
        emit signal(value); \
    } \
private: \
    type p_##name; \

#endif // PROPERTYHELPER_H

Sample usage:

#include <QObject>

#include "propertyhelper.h"

class QmlGameUi : public QObject
{
    Q_OBJECT
    Q_PROPERTY(int score READ score WRITE setScore NOTIFY scoreChanged)

public:
    explicit QmlGameUi(QObject *parent = 0);

public: // property getters and setters
    PROPERTY_HELPER(int,score,score,setScore,scoreChanged)

signals: // property notify signals
    void scoreChanged(int value);
};