example for object-oriented programming

user.h

#pragma once
#include "stable.h"

namespace gui { class UserDialog; class AdminDialog; }

namespace data
{
    class User : public QObject
    {
        Q_OBJECT
        friend class gui::UserDialog;

    public:
        User(QObject *parent = 0) : QObject(parent) { load(QSqlRecord()); }
        virtual ~User() { save(); }

        PROP(bool, prefersSi, setSiPreference)
        PROP(QDateTime, lastLogon, setLastLogon)
        PROP(QString, name, setName) //     PROP_W(QString, name, setName, protected)
        PROP(bool, isActive, setActive)
        PROP_W(QDateTime, lastUpdated, setLastUpdated, private)
        PROP_W(QDateTime, created, setCreated, private)
        PROP_W(quint64, id, setId, private)

        bool changePassword(const QString &currentClearTextPass, const QString &newClearTextPass);

        //! Retrieves the corresponding name for the user id.
        static QString nameFromId(quint64);

//	protected:
        void load(const QSqlRecord &);
        bool save();
    };

    class Administrator : public User
    {
        Q_OBJECT
        friend class gui::UserDialog;

    public:
        Administrator(QObject *parent = 0) : User(parent) { }

        bool addUser(const QString &name, bool isAdmin);

        //! Deactivates a user -- does *not* delete;
        bool removeUser(quint64 id);

        //! Resets a user's password to the default.
        bool resetUserPassword(quint64 id);

        QList<quint64> getAllUsers() const;

    private:
        static User* tryLogin(const QString &name, const QString &clearTextPass);
        static User* forceLogin(const QString &name);
        static User* _processLogin(QSqlQuery &q);
    };
}