class schermata : public QWidget
{
    Q_OBJECT
private:
    QVector<fonte*>* db_f;
    nuovaFonte NF_fin;
...
}

schermata::schermata(QWidget *parent) :
    db_f(new QVector<fonte*>),
    NF_fin(db_f),
    QWidget(parent){
    resize(1000, 300);
...
}




class nuovaFonte : public QWidget
{
    Q_OBJECT
private:
    QVector<fonte*>* db_f;
...
}

nuovaFonte::nuovaFonte(QVector<fonte*>* dati, QWidget *parent) :
    db_f(dati),
    QWidget(parent){

    setFixedWidth(400);
...
}