What this statement in qt c++ does?

Question

I'm learning qt framework for c++ and I'm not able to understand what this statement does:

Window::Window (QWidget *parent) : QWidget(parent) { .... }

// (QWidget *parent) : QWidget(parent) <---

Answer 1

This statement means calling base class constructor. In your context it is widget class. It is base class for window. Actually parent widget will be passed to this constructor