Qt-interest Archive, April 2007
uninitialized reference member in Qt 4.2.3
Message 1 in thread
Guys,
I am kind of confused by the usage of "uninitialized reference" in
Qt4.2.3example.
To be exact, around line 105 in
Qt-4.2.3/examples/graphicsview/portedcanvas/canvas.h,
it goes like:
........
private:
QGraphicsScene& canvas;
FigureEditor *editor;
........
As I know, the uninitialized reference is not allowed in c++, then how come
it works here, which is really confusing to me.
Any ideas?
thanks
S.C.
Message 2 in thread
It is initialized in the classes constructor initializer list from the
parameter 'c':
Main::Main(QGraphicsScene& c, QWidget* parent, const char* name,
Qt::WindowFlags f) :
Q3MainWindow(parent,name,f),
canvas(c)
S.C. Yu wrote:
> Guys,
>
> I am kind of confused by the usage of "uninitialized reference" in
> Qt4.2.3 example.
> To be exact, around line 105 in
> Qt-4.2.3/examples/graphicsview/portedcanvas/canvas.h, it goes like:
> ........
> private:
> QGraphicsScene& canvas;
> FigureEditor *editor;
> ........
>
> As I know, the uninitialized reference is not allowed in c++, then how
> come
> it works here, which is really confusing to me.
>
> Any ideas?
>
> thanks
>
> S.C.
>
>
>
--
[ signature omitted ]
Message 3 in thread
I just realized that. Thanks.
S.C.
On 4/10/07, Andrew Ward <andy.ward@xxxxxxxxxx> wrote:
>
> It is initialized in the classes constructor initializer list from the
> parameter 'c':
>
> Main::Main(QGraphicsScene& c, QWidget* parent, const char* name,
> Qt::WindowFlags f) :
> Q3MainWindow(parent,name,f),
> canvas(c)
>
>
>
> S.C. Yu wrote:
> > Guys,
> >
> > I am kind of confused by the usage of "uninitialized reference" in
> > Qt4.2.3 example.
> > To be exact, around line 105 in
> > Qt-4.2.3/examples/graphicsview/portedcanvas/canvas.h, it goes like:
> > ........
> > private:
> > QGraphicsScene& canvas;
> > FigureEditor *editor;
> > ........
> >
> > As I know, the uninitialized reference is not allowed in c++, then how
> > come
> > it works here, which is really confusing to me.
> >
> > Any ideas?
> >
> > thanks
> >
> > S.C.
> >
> >
> >
>
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