[Qt-interest] remove all elements from a QPainterPath

[Stephen Chu]

You are right. It doesn't really work since it will also leave other 
data members in MyPath in some undefined state.

Well. I tried. :)

In article 
<AANLkTikQbSUdt=x6oWCuDgCLswehMRt3VGF_5xBX3dMG at mail.gmail.com>,
 Sean Hayes <sean.t.hayes at vanderbilt.edu> wrote:

> Markus,
> 
> Very clever thought. However, I believe that making assignments to the this
> pointer violates the C++ standards and will not compile on most modern
> compilers. Therefore, the following statement should not work.
> 
> *this = QPainterPath();
> 
> I have heard that you can get this functionality in gcc by using
> "-fthis-is-variable". However, that would be really bad practice for new
> code. Even if it did compile, wouldn't it only change the value of the local
> copy of the this pointer? That is, the new value of this would leave scope
> when the method returned.
> 
> Regards,
> Sean
> 
> On Thu, Mar 31, 2011 at 8:51 AM, Stephen Chu <stephen at ju-ju.com> wrote:
> 
> > In article
> > <OF3CD162E1.6EF3F42A-ONC1257864.0026ABC7-C1257864.00291B34 at sebakmt.com>,
> >  Markus Franke <Franke.M at sebakmt.com> wrote:
> >
> > > Dear Alex,
> > >
> > > thanks for your reply. However, this is not really what I want to
> > achieve.
> > >
> > > I would like to inherit from QPainterPath and then clear the path from
> > > within a member function of this derived class.
> > >
> > > Best regards,
> > > Markus Franke
> >
> > How about this?
> >
> > class MyPath : public QPainterPath {
> >   MyPath(const QPainterPath & copy) : QPainterPath(copy) {}
> >   void clear() {
> >      *this = QPainterPath();
> >   }
> > };
> >
> > --
> > Stephen Chu
> > _______________________________________________
> > Qt-interest mailing list
> > Qt-interest at qt.nokia.com
> > http://lists.qt.nokia.com/mailman/listinfo/qt-interest
> >

-- 
Stephen Chu