My <QtGui> file is not working

[TMahoney1979]

I think that my <QtGui> file is incomplete or has nothing in it. When I substitute the header file for the many widget classes I need for my project (as per the tutorial instructions), it's supposed to save typing and space in the .cpp file. It will not work. I think that the file is incomplete or has nothing in it.
This...

#include <QtGui>

instead of...

#include <QWidget>
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QPushButton>

Does not work.

Does anyone have an answer as to how come the <QtGui> header file is not working? Thanks.

[raven-worx]

@TMahoney1979
try #include <QtWidgets> ;)

[mranger90]

As raven-worx pointed out, you should include QtWidgets.
This has been necessary since Qt 5.0
I suspect you are looking at code/examples or a book based on Qt 4.X.
If so, you should reference:

https://wiki.qt.io/Transition_from_Qt_4.x_to_Qt5