[vtkusers] What exactly happens in this scenario?

[Xiaofeng Z]

Or to use smart pointer, at least for vtkActor2D

x.z.


 
> Date: Fri, 25 Jun 2010 07:55:03 -0400
> From: bill.lorensen at gmail.com
> To: rakeshthp at in.com
> CC: vtkusers at vtk.org
> Subject: Re: [vtkusers] What exactly happens in this scenario?
> 
> Yes, it will leak.
> 
> To prevent the leak,, in your constructor,
> elementNumberActor = NULL;
> 
> In DisplayElementNumbers() before assigning the actor,
> if (elementNumberActor != NULL)
> {
> elementNumberActor->Delete();
> }
> 
> In the destuctor,
> if (elementNumberActor != NULL)
> {
> elementNumberActor->Delete();
> }
> 
> 
> On Fri, Jun 25, 2010 at 7:43 AM, Rakesh Patil <rakeshthp at in.com> wrote:
> > Hello,
> >
> > I want to know what exactly happens in this scenario. I have a C++ class
> > say, "myClass"
> >
> > myClass
> > {
> > ...
> > vtkActor2D *elementNumberActor;
> > ...
> > public:
> > ... // Constructors and destructors
> >
> > void DisplayElementNumbers();
> > ...
> > };
> >
> > Now, i have the function body as follows:
> >
> > void myClass::DisplayElementNumbers()
> > {
> > vtkIdFilter *ids = vtkIdFilter::New();
> > ids->SetInputConnection( programmableFilter-> GetOutputPort() );
> > ids->CellIdsOn();
> > ids->FieldDataOn();
> >
> > vtkCellCenters *cellC = vtkCellCenters::New();
> > cellC->SetInputConnection( ids->GetOutputPort() );
> >
> > vtkSelecttVisiblePoints *vispts = vtkSelectVisiblePoints::New();
> > vispts->SetInputConnection( cellC->GetOutputPort() );
> > vispts->SetRenderer( pRenderer );
> >
> > vtkLabelDataMapper *ldm = vtkLabelDataMapper::New();
> > ldm->SetInputConnection( vispts->GetOutput Port() );
> > ldm->SetLabelModeToLabelFieldData();
> >
> > elementNumberActor = vtkActor2D::New();
> > elementNumberActor->SetMapper (ldm );
> >
> > ldm->Delete();
> > vispts->Delete();
> > cellC->Delete();
> > ids->Delete();
> >
> > }
> >
> > Well, the statement in the box is
> >
> > elementNumberActor = vtkActor2D::New();
> >
> > If i call this function again and again, will this statement cause in memory
> > leak ??
> > How and what will be the performance of my application??
> >
> > Thanks in advance
> >
> > Regards
> > Rakesh Patil
> >
> >
> > Dear VTK ! Get Yourself a cool, short @in.com Email ID now!
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