[Insight-users] More flexible assignment for itk::SmartPointer

[Maarten Nieber]

Hi,

I hope I am not restarting any old discussions, but I would like to be able to assign an itk::SmartPointer to another pointer that has a compatible type, for example:

itk::Image<3, double>::Pointer image = itk::Image<3, double>::New();
itk::ImageBase<3>::Pointer p = image;

Note that boost::shared_ptr works like this.
The behaviour could be achieved using a templated copy constructor for itk::SmartPointer:

template< class TObjectType2 >
SmartPointer(const SmartPointer<TObjectType2>& rhs)
{
    // do a dynamic_cast here, and assign the result to rhs
}

Would this be a good idea?

Best regards, 
Maarten


      
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