Qt, enums and metaobject compiler

Question

I have a following user class:

class MyLine : public QLineEdit
{
    Q_OBJECT

    Q_ENUMS(Base::LineState)

public:
    explicit MyLine (QWidget *parent = 0);
};

Also I have base class containing all global enums:

class Base
{
    Q_GADGET

    Q_ENUMS(LineState)

public:
    // The states for MyLine
    enum LineState
    {
        Empty, Correct, Wrong
    };
};

When I compiled this code I got a following error: undefined reference to "Base::staticMetaObject"

What need to do?

Where's the declaration of Base? Note that enums used with Q_ENUMS must be declared in a QObject subclass. — Frank Osterfeld, Nov 16 '13 at 19:24
I tried it, but it did not help me. In documentation writed: `Use Q_GADGET instead of Q_OBJECT to enable the meta object system's support for enums in a class that is not a QObject subclass`. http://qt-project.org/doc/qt-5.0/qtcore/qobject.html — Queue Overflow, Nov 16 '13 at 19:30
Sorry, I mistaken in the name of class (I just renamed some variables when posting code for clearity) :( — Queue Overflow, Nov 16 '13 at 19:33

score 3 · Accepted Answer · answered Nov 16 '13 at 21:28

3

You don't need first Q_ENUMS(Base::LineState) in MyLine class, you are generating this meta data in Base class.

Also you have to add header file with Base class to list of HEADERS in pro file so the moc tool could generate code for meta data.

answered Nov 16 '13 at 21:28

Marek R

32,568
6
55
140

`You don't need first Q_ENUMS(Base::LineState) in MyLine class, you are generating this meta data in Base class` - it is genius and it work! I deleted this part of code and all are working now. Thank you for help! – Queue Overflow Nov 16 '13 at 21:43

Qt, enums and metaobject compiler

1 Answers1