how can i initialize a static pointer in c++?

Question

I have following code snippet. I want to access my stack from another class. (This stack is filled with QWidgets which i need in some other classes). But i didn't even get as far as initializing my static variable in my mainwindow constructor. The error message is : "qualified-id in declaration before '=' token"

/*mainwindow.h*/
class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0); //Konstruktor
    ~MainWindow(); //Destruktor

    //static QStack<QWidget*> *widgetStack;
    //static QStack<QWidget*> getWidgetStack();
    static QStack<QWidget*> *widgetStack;


private:
    Ui::MainWindow *ui;

/*mainwindow.cpp*/
MainWindow::MainWindow(QWidget *parent) :QMainWindow(parent), ui(new Ui::MainWindow)
{
    /*ui->setupUi(this);
     QStack<QWidget*> *MainWindow::widgetStack = new QStack<QWidget*>();

}

/*A method in another class*/
void Support::on_Taster_Power_clicked()
{
    MainWindow.widgetStack->pop();
}

I tried really a lot but nothing worked out for me. please help. thanks in advance

Answer 1

/*mainwindow.cpp*/

QStack<QWidget*> *MainWindow::widgetStack = new QStack<QWidget*>();

MainWindow::MainWindow(QWidget *parent) :QMainWindow(parent), ui(new Ui::MainWindow)
{
    /*ui->setupUi(this); */
}