Whats a QObject?

MokJ

yeah thats my question.
What are the objects or class could be called QObjects ?
Can we say QTcpSOcket is a QObject ?
Whenever I search for a QObject , search engine shows me QObject as a class.
I want to know what object(s ) can be called a QObject?

Taz742

Welcome @MokJ
QObject is the base class for the other Qt classes.
QTcpSocket, QWidget as well as and every Qt class is QObject.

Also if you want to use Qt SIGNAL & SLOT, QObject must be parent of your class.

jsulm

@MokJ To add to @Taz742 If you have a class A and a class B which inherits from A then you can say that any instance of B is an A. This is how inheritance in object oriented languages works.

class Car
{
};

class BMW : public Car
{
};

BMW b;

In this example b is a BMW AND a Car.

MokJ

@Taz742 and @jsulm thanks very much...
For clearing my doubt.

SGaist

Hi,

One very important correction: NOT all classes from the Qt framework are QObject based. That wouldn't make sense at all.

Such classes include: QString, QRegularExpression, QGraphicsItem etc.