Proper way to pass QColor or QFont to a Qdialog subclass?

Hi,

I am having a problem with a QDialog subclass that I am using to pass two QT Objects into: QColor and QFont. Basically my subclass looks like this:

HEADER:

class MySettingsDialog : public QDialog
{
Q_OBJECT

public:
explicit MySettingsDialog(QColor *acolor, QFont *afont, QWidget *parent=0);

CLASS FILE:
MySettingsDialog::MySettingsDialog(QColor *acolor, QFont *afont, QWidget *parent) :
QDialog(parent, Qt::WindowCloseButtonHint), m_color(*acolor), m_font(*afont),
ui(new Ui::MySettingsDialog)
{

ui->setupUi(this);
}

This way works but I have to in my MainWindow.cpp file declare for example:
QFont * systemFont;

systemFont = New QFont("myfont whatever");

And everywhere I want to apply that font I have to unmask like this ui->mylabel->setfont(*systemFont).

Before I wasn't using 'new' to instantiate my systemFont variable and systemFont wasn't declared as a pointer in the header file.
Such that if Mydialog was declared like this the program crashes:

explicit MySettingsDialog(QColor &acolor, QFont &afont, QWidget *parent=0);

CLASS FILE:
MySettingsDialog::MySettingsDialog(QColor &acolor, QFont &afont, QWidget *parent) :
QDialog(parent, Qt::WindowCloseButtonHint), m_color(acolor), m_font(afont),
ui(new Ui::MySettingsDialog)
{

ui->setupUi(this);
}

What am I doing wrong?

Thanks