[vtkusers] What exactly happens in this scenario?

[Bill Lorensen]

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
>
>
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