[vtkusers] A template to avoid calling vtkObjectBase->Delete()

[William A. Hoffman]

In cvs VTK there is a class called vtkSmartPointer that does just this.
It is used like this:

#include "vtkSmartPointer.h"

....
 vtkSmartPointer<vtkPoints> outputPoints = vtkSmartPointer<vtkPoints>::New();


-Bill

At 11:13 AM 4/28/2004, REGAT-BARREL Aurélien wrote:
>Hello world,
>In C++, the need to keep track of created objects in order to call Delete on exit is cumbersome.
>So, I plan to use a small template to avoid calling Delete.
>I would like your opinion :
> 
>#ifndef __vtkClassPtr_h
>#define __vtkClassPtr_h
>template<class T>
>class vtkClassPtr
>{
>public:
>    vtkClassPtr( T * O ) : ptr( O ) {}
>    ~vtkClassPtr() { this->ptr->Delete(); }
>    operator T*() const { return this->ptr; }
>    T& operator*() const { return *this->ptr; }
>    T* operator->() const { return this->ptr; }
>    vtkClassPtr( const vtkClassPtr & P )
>    {
>        this->ptr = P.ptr;
>        P.ptr->Register( this->ptr );
>    }
>    
>private:    
>    T * ptr;
>};
>#endif
>------------------------------------------------------------------------
>Now, have a look at the adapted Cone.cxx example :
> 
>#include "vtkConeSource.h"
>#include "vtkPolyDataMapper.h"
>#include "vtkRenderWindow.h"
>#include "vtkRenderWindowInteractor.h"
>#include "vtkCamera.h"
>#include "vtkActor.h"
>#include "vtkRenderer.h"
>#include "vtkInteractorStyleTrackballCamera.h"
> 
>#include "vtkClassPtr.h"
>typedef vtkClassPtr< vtkConeSource > vtkConeSourcePtr;
>typedef vtkClassPtr< vtkPolyDataMapper > vtkPolyDataMapperPtr;
>typedef vtkClassPtr< vtkActor > vtkActorPtr;
>typedef vtkClassPtr< vtkRenderer > vtkRendererPtr;
>typedef vtkClassPtr< vtkRenderWindow > vtkRenderWindowPtr;
>typedef vtkClassPtr< vtkRenderWindowInteractor > vtkRenderWindowInteractorPtr;
>typedef vtkClassPtr< vtkInteractorStyleTrackballCamera > vtkInteractorStyleTrackballCameraPtr;
> 
>int main( int argc, char *argv[] )
>{
>    vtkConeSourcePtr cone = vtkConeSource::New();
>    {
>        vtkConeSourcePtr cone2 = cone;
>        cone2->SetHeight( 3.0 );
>        cone2->SetRadius( 1.0 );
>        cone2->SetResolution( 10 );
>    }
>    vtkPolyDataMapperPtr coneMapper = vtkPolyDataMapper::New();
>    coneMapper->SetInput( cone->GetOutput() );
>    vtkActorPtr coneActor = vtkActor::New();
>    coneActor->SetMapper( coneMapper );
>    vtkRendererPtr ren1= vtkRenderer::New();
>    ren1->AddActor( coneActor );
>    ren1->SetBackground( 0.1, 0.2, 0.4 );
>    vtkRenderWindowPtr renWin = vtkRenderWindow::New();
>    renWin->AddRenderer( ren1 );
>    renWin->SetSize( 300, 300 );
>    vtkRenderWindowInteractorPtr iren = vtkRenderWindowInteractor::New();
>    iren->SetRenderWindow(renWin);
>    vtkInteractorStyleTrackballCameraPtr style = 
>        vtkInteractorStyleTrackballCamera::New();
>    iren->SetInteractorStyle(style);
>    iren->Initialize();
>    iren->Start();        
>    return 0;
>}
> 
>
>
>Aurélien REGAT-BARREL
>
>
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