[Insight-developers] bcc error

[Luis Ibanez]

Hi Josh,

Borland definetly manage the access
rights of derived classes in a particular
(non-standard) way.

We had a similar problem in the past when
creating the STL adaptor for the VectorContainer.
At the end we compromised in letting the
derivation be public. (not an optimal solution).


It is unfortunate the Borland does that since
this is a pretty basic functionality.


As an alternative...
Wouldn't be ok if insted of exposing the method
you delegate from the base class ?

like


class ConstShapedNeighborhoodIterator : private NeighborhoodIterator
{
public:
    GetPixel()
      {
      Superclass::GetPixel(); // invoke the method in the base class
      }
protected:
    SetPixel()
      {
      Superclass::SetPixel;  // invoke the method in the base class
      }

};


Hopefully the methods will be inlined and no
performance penalty will occur...



   Luis


---------------------------------------------

Joshua Cates wrote:

> Hi all,
> 
> I'm puzzled by an error I'm getting from the Borland compiler.  I don't 
> understand why it is identified as an error.
> 
> The error results from the following construct:
> 
> class NeighborhoodIterator
> {
> public:
>   void SetPixel(PixelType);
>   PixelType GetPixel();
> };
> 
> class ConstShapedNeighborhoodIterator : private NeighborhoodIterator
> {
> public:
>   Superclass::GetPixel; // expose this method to the public interface
> protected:
>    Superclass::SetPixel;  // hide this method from public interface, but 
>                           // keep it accessible to subclass
> };
> 
> class ShapedNeighborhoodIterator : public ConstShapedNeighborhoodIterator
> {
> public:
>   Superclass::SetPixel;  // expose again to public interface
> };
> 
> 
> Error E2009 
> C:\itkQuality\Insight\Code\Common\itkConstShapedNeighborhoodIterator.h 
> 285: Attempt to grant or reduce access to 
> 'itk::NeighborhoodIterator<TestImageType,itk::ZeroFluxNeumannBoundaryCondition<TestImageType> 
> 
>>::SetPixel(const unsigned int,const itk::Index<4> &,bool &)' in function 
>>
> PrintShapedNeighborhood(const 
> itk::ConstShapedNeighborhoodIterator<TestImageType,itk::ZeroFluxNeumannBoundaryCondition<TestImageType> 
> 
>>&)
>>
> 
> 
> My intent is, in fact, to reduce access to SetPixel in
> ConstShapedNeighborhood.  Why should this be an error?  (Even vc++ allows
> it.)  If I move the declaration of SetPixel to public in
> ConstShapedNeighborhoodIterator, Borland is happy.
> 
> Josh.
> 
> ______________________________
>  Josh Cates			
>  School of Computer Science	
>  University of Utah
>  Email: cates@sci.utah.edu
>  Phone: (801) 587-7697
>  URL:   http://www.sci.utah.edu/~cates
> 
> 
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