[Plugin-Dev] invalid use of "::" when using non-Qt-namespace with QDebug

[manuelsch]

Hi,

I'm writing a Qt-Plugin access MongoDB from QML.
But anytime I add @#include <QDebug>@ to my source file or header file, the compilation of my QObject-derived-class that uses types in the mongo namespace failes with the error
@/usr/include/qt4/QtCore/qvector.h:83: Error:invalid use of ‘::’@
It does not matter if I write @use namespace mongo@ or not (If I don't write that, I must put "mongo::" everywhere any the resulting error message states @Error:invalid use of ‘mongo::’@)
But if I don't include QDebug, everything works fine!

The head of my .pro file looks like this:
@TEMPLATE = lib
CONFIG += qt plugin
QT += core declarative
@

Can anybody tell me what I'm doing wrong here?

Edit: moved to General as it doesn't seem to be a QML/Quick specific issue; Andre

[giesbert]

Hi manuelsch,

can you please check, whether it also appears if you include qvector directly and not QDebug? That would state whether the problem is with qdebug or qvector.

If I look at QVector line 83, I see:

@
static QVectorData *malloc(int sizeofTypedData, int size, int sizeofT, QVectorData *init);
@

But that might be different on your machine, as I might use different version / license.
Please have a look what is located in QVector.h line 83 and post it here

[manuelsch]

Thanks, Gerolf!

Yes, I also have this line at this position in the file.
But I figured out how to solve it.

Don't ask my why, but it's simple: just put @#include <QDebug>@ at the very top of the .cpp file.
If it is the first file that is included, it works!

[giesbert]

what did you includa before on top (or before QDebug)?
It must have some influence on that lines...