error: 'Q_DECL_OVERRIDE' does not name a type

deglans

Hi!
I'm new of QT world, so I'm trying this example Mandelbrot Example.
I have copy accurately the example but i get this error:

I use Kubuntu 16.04 with Qt Creator 3.5.1 installed by repo.
Thanks for any hints!

mrjj

That is odd. Your compiler should be pretty new.
This is the exact sample?

You can remove it. It "just" informs you if u dont really override anything.

Hmm what version of Qt did u install?
Qt 5?
Check with qmake -v

deglans

$ qmake -v
QMake version 2.01a
Using Qt version 4.8.7 in /usr/lib/x86_64-linux-gnu

yuvaram

Hi @deglans
I guess there is a issue with copying, So you can try like this,
In Qt Creator Examples(welcome > Examples) search for "Mandelbrot". Open it and compile it. This may help to find the issue.

SGaist

Hi,

That's because you are trying to build an example that's been update for Qt 5 with Qt 4.

Q_DECL_OVERRIDE has been introduced in Qt 5.

deglans

I have solved by installing some package (qt5-default, qtbase5, qttools5) so now i get:

$ qmake -v
QMake version 3.0
Using Qt version 5.5.1 in /usr/lib/x86_64-linux-gnu

Then from the IDE Tools > Options > Build & Run > Kits > Qt Version I have selected Qt5
Now all works fine, thanks.

rsal

Hi tried doing the things given in the last reply.
qt5-default was installed.
but got following error for qt5base:-
sudo apt-get install qtbase5
[sudo] password for rohit:
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package qtbase5

any help?

rsal

I added "-dev" in package name and it got installed. But still I am getting the error - error: 'Q_DECL_OVERRIDE' does not name a type. Please help.

SGaist

Did you change the Kit used to build the example ?

Hamed.Masafi

Put Q_DECL_OVERRIDE after method declaration, not before it.
Sample from Qt Doc

virtual void MyWidget::paintEvent(QPaintEvent*) Q_DECL_OVERRIDE;