[Interest] Is QMetaMethod::tag() functional?

[Thiago Macieira]

On terça-feira, 5 de março de 2013 21.14.32, Immanuel Weber wrote:
> Mhh, then I must be doing something wrong, here is my code example:

> #ifndef TAGCLASS_H
> #define TAGCLASS_H
> 
> #include <QObject>
> #define MYTAG // bla bla

This is the issue. In Qt 5, moc expands macros, so it must not see the 
expansion.

Take qdbusmacros.h:

#ifndef Q_MOC_RUN
# define Q_NOREPLY
#endif


> That should, as far as I understand, print the name and the tag of each
> invokable function of TagClass, but on my system (Win7x64 + Qt5.0.1x86) no
> tag is being printed for testFunc() :(

Yup. Take this source code, for example (it doesn't #include anything, it's 
just for testing):

#define Q_NOREPLY
class MyObject: public QObject {
Q_OBJECT
public slots:
    Q_NOREPLY void foo();
};

When processed with qdbuscpp2xml from Qt 4.8, it prints:
    <method name="foo">
      <annotation name="org.freedesktop.DBus.Method.NoReply" value="true"/>
    </method>

When processed with Qt 5, it prints:
    <method name="foo">
    </method>

It goes back to the original behaviour if I remove the #define line.
-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center
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