CODEWITHSUNDEEP
c++qtconstructor
gsgx
gsgx

Reputation: 12249

Default Initialization list in Qt Widget

when I make a new class in Qt based on QWidget, I get code that looks like this for the constructor,

Board::Board(QWidget *parent) : QWidget(parent) { }

It looks like the QWidget(parent) is part of an initialization list, but if that was true we'd be setting a variable called QWidget equal to the argument parent, correct? But I don't think there is any variable called QWidget. So is this a non-C++ concept and a concept specific to Qt to set the parent of a widget? Or is it actually a C++ concept? My best guess is that it's specific to Qt and you'd never see something like this in plain C++.

Upvotes: 1

Views: 660

Answers (1)

Reunanen
Reunanen

Reputation: 8001

It's a C++ thing: the constructor of the base class is called.

For more details, see e.g.: Tech-FAQ: Constructors in Derived Class

Upvotes: 3

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