No matching constructor for initialization of 'QQmlListProperty<Player>' - qt

Question

new bee here on QT.
I am trying to build an online example that used to work on QT5, but the compilation keeps failing on QT6. I keep getting this error and not sure why.
footballteam.cpp:55:12: No matching constructor for initialization of 'QQmlListProperty<Player>'
qqmllist.h:76:5: candidate constructor not viable:
no known conversion from 'int (*)(QQmlListProperty<Player> *)'
to 'QQmlListProperty<Player>::CountFunction'
(aka 'long long (*)(QQmlListProperty<Player> *)') for 4th argument
Code:
QQmlListProperty<Player> FootBallTeam::players()
{
return QQmlListProperty<Player>(this,this,&FootBallTeam::appendPlayer,
&FootBallTeam::playerCount,
&FootBallTeam::player,
&FootBallTeam::clearPlayers);
}
Classes:
class FootBallTeam : public QObject
{
Q_OBJECT
Q_PROPERTY(QString title READ title WRITE setTitle NOTIFY titleChanged)
Q_PROPERTY(QString coatch READ coatch WRITE setCoatch NOTIFY coatchChanged)
Q_PROPERTY(Player * captain READ captain WRITE setCaptain NOTIFY captainChanged)
Q_PROPERTY(QQmlListProperty<Player> players READ players NOTIFY playersChanged)
... bunch of stuff
private:
//Callback Methods
static void appendPlayer(QQmlListProperty<Player>*, Player*);
static int playerCount(QQmlListProperty<Player>*);
static Player* player(QQmlListProperty<Player>*, int);
static void clearPlayers(QQmlListProperty<Player>*);
....
class Player : public QObject
{
Q_OBJECT
Q_PROPERTY(QString name READ name WRITE setName NOTIFY nameChanged)
Q_PROPERTY(bool playing READ playing WRITE setPlaying NOTIFY playingChanged)
Q_PROPERTY(QString position READ position WRITE setPosition NOTIFY positionChanged)
public:
explicit Player(QObject *parent = nullptr);
QString name() const;
bool playing() const;
QString position() const;
void setName(QString name);
void setPlaying(bool playing);
void setPosition(QString position);
signals:
void nameChanged(QString name);
void playingChanged(bool playing);
void positionChanged(QString position);
private :
QString m_name;
bool m_playing;
QString m_position;
};
I looked into this thread, but did not help much.
Pass QQmlListProperty from QML to C++ as parameter
Any ideas why it does not compile on QT6?
thank you.

Answer 1

As pointed out by absolute.madnes, the fix was to change int to qsizetype
qsizetype FootBallTeam::playerCount(QQmlListProperty<Player> * list)
{
return reinterpret_cast<FootBallTeam*>(list->data)->playerCountCustom();
}
Player *FootBallTeam::player(QQmlListProperty<Player> * list, qsizetype index)
{
return reinterpret_cast<FootBallTeam*>(list->data)->playerCustom(index);
}