Initialiser list with QObject

[Atomic_Sheep]

Hi guys, I'm playing around with composition and inheritance for the first time and I'm hitting a bit of a problem.

From my understanding, to be able to have an object emit a signal and receive signals i.e. for that it must have slots, it must inherit QObject.

So I created my own class and included the Q_OBJECT macro:


class Button : public QObject
{
Q_OBJECT

However, I would also like this button to include other classes which outline the button position and other attributes in their own classes. When I created the initialiser list in the header file, the variables which I assigned to the Button members explicitly i.e. after the : symbol, spit out an error upon building...


'position' was not declared in this scope.

How do I solve this problem?

I tried simply adding my initialiser list after the


Button::Button(QObject *parent) :
QObject(parent)

but that didn't work.

[AlekseyOk]

Write full declaration of your class.

[Atomic_Sheep]

Could you please elaborate a little? I wrote the declaration for the class in its own header file and linked/included it into the class header file that I want to use as its parent.

[ChrisW67]

The error message implies that you are trying to initialise (BTW, are you Aussie?) a member variable called "position" that does not exist in the class. We cannot help specifically because you do not show us the declaration of the class and the offending lines.

[Atomic_Sheep]

Yep, I figured out the problem, I copied from another site not really understanding what it was doing and when I went back over it, I figured out why I totally messed up the initialisations.

Yep, Melb, I'm guessing my incessant use of s instead of z tipped you off :D.

[ChrisW67]

Yep, Melb, I'm guessing my incessant use of s instead of z tipped you off :D.
Dead give away, although you could have been Kiwi or a Pom.

[Atomic_Sheep]

Oh I see... forgot about those options.