[vtkusers] return vtkSmartPointers from a function and pass via signal/slot

[Dean Inglis]

Hi Miro,

> What would be the preferred way to pass objects stored as
vtkSmartPointer<T> object?
Here is one way to do it:

class myclass{

  myclass() { this->var = vtkSmartPointer<vtkClass>::New(); };

  vtkSmartPointer<vtkClass> GetvtkClass(){ return this->var; };

  // THIS IS ALSO VALID:
  // vtkClass* GetvtkClass(){ return this->var; };

  vtkSmartPointer<vtkClass> var;
};


> I want to pass the object via signal/slot mechanism. What would be the
best way?
look at vtk documentation for class vtkEventQtSlotConnect

Dean



On Wed, Aug 14, 2013 at 3:57 AM, Miro Drahos <miroslav.drahos at ucsf.edu>wrote:

>  Hi all,
>  I am having really hard times passing on reference to the objects that
> are stored as vtkSmartPointer<T> as private data within a class. E.g.:
> class MyClass
> {
>   public:
>     ...
>    private:
>     vtkSmartPointer<vtkPolyData> surface;
> };
>
> What is the best way to pass 'surface' via signal/slot mechanism of Qt?
> I thought I'd create a public method
> vtkPolyData * MyClass::getSurface() { return surface.GetPointer(); }
> The problem is that GetPointer() returns *const* T* which the compiler
> complains about when I later want to use it. As a matter of fact, all
> vtkSmartPointer's public methods return const something.
>
> What would be the preferred way to pass objects stored as
> vtkSmartPointer<T> object?
> 1.) T* MyClass::getT() const { return object.GetPointer(); }
> 2.) vtkSmartPointer<T> MyClass::getT() { return object; }
> 3.) something else?
>
> I want to pass the object via signal/slot mechanism. What would be the
> best way?
> A.) signal doneSurfaceProcessing(vtkPolyData &);
> B.) signal doneSurfaceProcessing(vtkPolyData *);
> C.) signal doneSurfaceProcessing(vtkSmartPointer<vtkPolyData>);
>
> Thank you!!
> Miro
>
>
>
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