Question

I have a class declared using this form

MainWindow(QWidget *parent) :
        QMainWindow(parent),
        ui(new Ui::MainWindow)
{
    ...
}

I want to refactor it with this form looking like this :

class MainWindow : QMainWindow, ui 
{
    MainWindow(QWidget *parent)
    {
        ...
    }
}

But I removed the parameters that were in the first form. What do this parameters mean ?

How to keep them in the second form ? Please explain me the first syntax (or point to tutorial). I don’t understand inheritance with parameters.

EDIT:

I understand the problem now, the class was initialised in a separate .h file which I did not saw at first look. I thought : after the method definition was inheritance operator, whereas it is member initialization operator.

Answer 1

This is the implementation of a constructor, calling a base class constructor and initializind a data member in the initialization list:

MainWindow(QWidget *parent) :
        QMainWindow(parent),   // call base class constructor
        ui(new Ui::MainWindow) // initialize data member ui
{
    ...
}

It is very likely that the class inherits from QMainWindow and has a Ui::MainWindow* data member called ui. Your second code snippet seems like an incorrect attempt to declare a class. There is no “inheritance with parameters” as such, so you cannot do what you ask about.